Carbocation is a reaction intermediate in which of the following reactions?

Carbocation is a reaction intermediate in which of the following reactions?
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Carbocation is a reaction intermediate in which of the following reactions? A. `E_(1)` reactions B. ... ^(1))` reaction D. All of the above
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Which of the following reaction mechanism doe not involves carbocation as an intermediate ?

Description : Which of the following reaction mechanism doe not involves carbocation as an intermediate ?

Last Answer : Which of the following reaction mechanism doe not involves carbocation as an intermediate ? A. ... C. Fries Rearrangements D. Diels- Alder reaction

Carbocation as an intermediate is likely to be formed in the reaction :

Description : Carbocation as an intermediate is likely to be formed in the reaction :

Last Answer : Carbocation as an intermediate is likely to be formed in the reaction : A. `"Hexene"overset("Anhyd ... + HCN"overset(.^(-)OH)rarr"acetonecyanohydrin"`

Phenol is more reactive than benzene towards electrophilic substitution reaction. In case of Phenol, the intermediate carbocation is more resonance st

Description : Phenol is more reactive than benzene towards electrophilic substitution reaction. In case of Phenol, the intermediate carbocation is more resonance st

Last Answer : Phenol is more reactive than benzene towards electrophilic substitution reaction. In case of Phenol, the ... D. A is incorrect but R is correct

Which of the following is not a correct statement about the electrophilic substitution mechanism of benzene? (a) Benzene functions as a nucleophile. (b) Formation of a carbocation intermediate is the rate-determining step. (c) The carbocation intermediate contains an sp3 hybridized carbon in the ring. (d) The addition product is a frequently observed minor product.

Description : Which of the following is not a correct statement about the electrophilic substitution mechanism of benzene? (a) Benzene functions as a nucleophile. (b) Formation of a carbocation intermediate is the ... hybridized carbon in the ring. (d) The addition product is a frequently observed minor product.

Last Answer : The addition product is a frequently observed minor product.

Which of the following is not a possible reaction of a carbocation? (a) addition of a nucleophile (b) rearrangement to a more stable carbocation (c) addition of a proton to form an alkane (d) loss of a β-hydrogen to form an alkene

Description : Which of the following is not a possible reaction of a carbocation? (a) addition of a nucleophile (b) rearrangement to a more stable carbocation (c) addition of a proton to form an alkane (d) loss of a β-hydrogen to form an alkene

Last Answer : addition of a proton to form an alkane

The total change in the enthalpy of a system is independent of the (A) Number of intermediate chemical reactions involved (B) Pressure and temperature (C) State of combination and aggregation in the beginning and at the end of the reaction (D) None of these

Description : The total change in the enthalpy of a system is independent of the (A) Number of intermediate chemical reactions involved (B) Pressure and temperature (C) State of combination and aggregation in the beginning and at the end of the reaction (D) None of these

Last Answer : (A) Number of intermediate chemical reactions involved

In the following carbocation, `H//CH_(3)` that is most likely to migrate to the positve charged carbon is : `H_(3)overset(1)C-overset(H)overset(|2)und

Description : In the following carbocation, `H//CH_(3)` that is most likely to migrate to the positve charged carbon is : `H_(3)overset(1)C-overset(H)overset(|2)und

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Which is most stable carbocation?

Description : Which is most stable carbocation?

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Carbon atom in methyl carbocation and methyl carbanion is _____ and ______ hybridised :

Description : Carbon atom in methyl carbocation and methyl carbanion is _____ and ______ hybridised :

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Most stable carbocation is:

Description : Most stable carbocation is:

Last Answer : Most stable carbocation is: A. B. C. D.

Most stable carbocation is:

Description : Most stable carbocation is:

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Which of the following statements is correct about a carbocation?

Description : Which of the following statements is correct about a carbocation?

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The most stable carbocation is :

Description : The most stable carbocation is :

Last Answer : The most stable carbocation is : A. methyl carbocation B. primary carbocation C. secondary carbocation D. tertiary carbocation

What is the name given for a species that contains a positively charged carbon atom? (a) carbanion (b) carbocation (c) methyl radical (d) free radical

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Last Answer : carbanion

Match the reactions in Column I with appropriate types of steps/reactive intermediate involved in these reactions as given in Column II.

Description : Match the reactions in Column I with appropriate types of steps/reactive intermediate involved in these reactions as given in Column II.

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Fibrinolytic therapy is based on activation of plasminogen, the inactive proteolytic enzyme of plasma that binds to fibrin during the formation of thrombosis. Activation of plasminogen to plasmin results in selective thrombolysis at the fibrin clot surface. Which of the following statement(s) is/are true concerning agents used in thrombolytic therapy? a. Streptokinase is a bacterial protein which is antigenic in humans, resulting in allergic reactions in up to l5% of cases b. Tissue plasminogen activator acts directly on plasmin without an intermediate drug–plasmin complex c. The half-life of urokinase, streptokinase, and TPA all exceed 30 minutes d. Streptokinase is significantly cheaper than urokinase or TPA

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Last Answer : Answer: a, b, d Streptokinase is a bacterial protein produced by group C b-hemolytic streptococci. It is therefore antigenic in humans and can be associated with allergic reaction in ... one agent over the other. Streptokinase however, is markedly less expensive than either urokinase or TPA

An organic compound (A) has a molecular weight 78 and an empirical formula CH. (A) is resistant to attack by oxidizing agents but undergoes substitution and addition reactions. X-ray analysis shows that the distance between adjacent carbon atoms is 1.39Å (intermediate between single and double bond lengths). The evidence suggests that compound (A) is (a) Benzene (b) Cyclohexane (c) Toluene (d) n-Hexane

Description : An organic compound (A) has a molecular weight 78 and an empirical formula CH. (A) is resistant to attack by oxidizing agents but undergoes substitution and addition reactions. X-ray analysis shows that the ... suggests that compound (A) is (a) Benzene (b) Cyclohexane (c) Toluene (d) n-Hexane

Last Answer : Benzene

An organic compound (A) has a molecular weight 78 and an empirical formula CH. (A) is resistant to attack by oxidizing agents but undergoes substitution and addition reactions. X-ray analysis shows that the distance between adjacent carbon atoms is 1.39Å (intermediate between single and double bond lengths). The evidence suggests that compound (A) is (a) Benzene (b) Cyclohexane (c) Toluene (d) n-Hexane

Description : An organic compound (A) has a molecular weight 78 and an empirical formula CH. (A) is resistant to attack by oxidizing agents but undergoes substitution and addition reactions. X-ray analysis shows that the ... suggests that compound (A) is (a) Benzene (b) Cyclohexane (c) Toluene (d) n-Hexane

Last Answer : Benzene

Why do aldehydes undergo nucleophilic addition reactions while esters undergo nucleophilic acyl substitution reactions? (a) The carbonyl carbon of an ester is more electrophilic than that of an aldehyde. (b) Aldehydes are more sterically hindered than esters. (c) Once the nucleophile adds to an aldehyde, the tetrahedral intermediate is too sterically hindered to eliminate one of the attached groups. (d) Once the nucleophile adds to an aldehyde, neither H− nor R− can be eliminated since they are strongly basic

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Last Answer : Once the nucleophile adds to an aldehyde, neither H− nor R− can be eliminated since they are strongly basic

In the reaction the intermediate(s) is/are:

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Last Answer : In the reaction the intermediate(s) is/are: A. B. C. D.

`{:(" "O^(16)),(" ||"),(CH_(3)-C-H overset(D_(2)O^(18))underset(D^(o+))to CH_(3)-C-H),(" ||"),(" "._(18)O):}` Give the following reaction intermediate

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Last Answer : `{:(" "O^(16)),(" ||"),(CH_(3)-C-H overset(D_(2)O^(18))underset(D^(o+))to CH_(3)-C-H),(" ||"),(" "._( ... ,(" |"),(CH_(3)-C-H),(" |"),(" "._(18)OD):}`

The reaction intermediate produce by homolytic cleavage of bond is called,

Description : The reaction intermediate produce by homolytic cleavage of bond is called,

Last Answer : The reaction intermediate produce by homolytic cleavage of bond is called, A. carbocations B. carbanions C. free radicals D. carbenes

`{:(" "O^(16)),(" ||"),(CH_(3)-C-H overset(D_(2)O^(18))underset(D^(o+))to CH_(3)-C-H),(" ||"),(" "._(18)O):}` Give the following reaction intermediate

Description : `{:(" "O^(16)),(" ||"),(CH_(3)-C-H overset(D_(2)O^(18))underset(D^(o+))to CH_(3)-C-H),(" ||"),(" "._(18)O):}` Give the following reaction intermediate

Last Answer : `{:(" "O^(16)),(" ||"),(CH_(3)-C-H overset(D_(2)O^(18))underset(D^(o+))to CH_(3)-C-H),(" ||"),(" "._( ... ,(" |"),(CH_(3)-C-H),(" |"),(" "._(18)OD):}`

The reaction intermediate produce by homolytic cleavage of bond is called,

Description : The reaction intermediate produce by homolytic cleavage of bond is called,

Last Answer : The reaction intermediate produce by homolytic cleavage of bond is called, A. carbocations B. carbanions C. free radicals D. carbenes

(A) `S_(N^(2))` reactioin takes place in single step. (R) `S_(N^(2))` reaction involves transition state intermediate.

Description : (A) `S_(N^(2))` reactioin takes place in single step. (R) `S_(N^(2))` reaction involves transition state intermediate.

Last Answer : (A) `S_(N^(2))` reactioin takes place in single step. (R) `S_(N^(2))` reaction involves transition ... . D. IF (A) is incorrect but (R) is correct.

The reaction intermediate carbenes are produced from"

Description : The reaction intermediate carbenes are produced from"

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Reimer-Tiemann reaction of phenol with cholorform and aqueous alkali takes place through the intermediate formation of:

Description : Reimer-Tiemann reaction of phenol with cholorform and aqueous alkali takes place through the intermediate formation of:

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Reaction involves isocyanate as intermediate porudct:

Description : Reaction involves isocyanate as intermediate porudct:

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`C_(6)H_(5)-CH_(2)-I overset(NaN_(3))underset(Delta)rarr` Products Reaction is assumed to involve nitrene as intermediate, then various possible produ

Description : `C_(6)H_(5)-CH_(2)-I overset(NaN_(3))underset(Delta)rarr` Products Reaction is assumed to involve nitrene as intermediate, then various possible produ

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If you need to reverse the following reaction and multiply it by 2 in order for it to be an intermediate reaction in a Hess's law problem what would be the final value for the enthalpy of reaction yo?

Description : If you need to reverse the following reaction and multiply it by 2 in order for it to be an intermediate reaction in a Hess's law problem what would be the final value for the enthalpy of reaction yo?

Last Answer : 2820 kJ

If you need to reverse the following reaction in order for it to be an intermediate reaction in a Hess's law problem what would be the final value for the enthalpy of rea?

Description : If you need to reverse the following reaction in order for it to be an intermediate reaction in a Hess's law problem what would be the final value for the enthalpy of rea?

Last Answer : 286 kJ

Pick out the correct statement. (A) Reaction of NH3 with HNO3 to produce (NH4 )2NO3 is endothermic (B) With increase in NH3 /CO2 ratio, urea yield decreases for a given temperature, pressure and total feed rate (C) Biuret (an intermediate during urea manufacture) is toxic to seeds and animals (D) Both (B) and (C)

Description : Pick out the correct statement. (A) Reaction of NH3 with HNO3 to produce (NH4 )2NO3 is endothermic (B) With increase in NH3 /CO2 ratio, urea yield decreases for a given temperature, pressure and total ... (an intermediate during urea manufacture) is toxic to seeds and animals (D) Both (B) and (C)

Last Answer : (B) With increase in NH3 /CO2 ratio, urea yield decreases for a given temperature, pressure and total feed rate

Rate determining step in a reaction consisting of a number of steps inseries is the __________ step.(A) Fastest(B) Slowest(C) Intermediate(D) Data insufficient; can't be predicted

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Last Answer : (B) Slowest

For a heterogeneous catalytic reaction (A) Free energy of activation is lowered in the presence of catalyst, which remains unchanged at the end of reaction (B) A relatively small amount of catalyst can cause the conversion of large amount of reactants which does not mean that catalyst concentration is important (C) The catalyst does not form an intermediate complex with the reactant (D) The surface of the catalyst does not play an important role during reaction

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Last Answer : (A) Free energy of activation is lowered in the presence of catalyst, which remains unchanged at the end of reaction

Maximum equilibrium conversion for endothermic reaction is obtained at the __________ temperature. (A) Highest possible (B) Lowest possible (C) Intermediate (D) Room

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What purpose does FeCl3 serve in the electrophilic aromatic substitution reaction between chlorine and benzene? (a) It serves as a radical initiator to produce the chlorine radical needed to propagate the chain reaction. (b) It functions by destabilizing the carbocationic intermediate and thereby increases the rate of H+ loss. (c) It serves as a Lewis base catalyst by reacting with Cl2 to generate chloride ions. (d) It serves as a Lewis acid catalyst by reacting with the Cl2 and thereby activates it toward attack by benzene’s π electrons.

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Last Answer : It serves as a Lewis acid catalyst by reacting with the Cl2 and thereby activates it toward attack by benzene’s π electrons.

Why is the halogenation of alkanes considered a chain reaction? (a) it occurs quickly. (b) it occurs without the generation of intermediates. (c) each step generates the reactive intermediate that causes the next step to occur. (d) the reaction allows long chains of halogenated alkanes to be formed

Description : Why is the halogenation of alkanes considered a chain reaction? (a) it occurs quickly. (b) it occurs without the generation of intermediates. (c) each step generates the reactive intermediate that causes the next step to occur. (d) the reaction allows long chains of halogenated alkanes to be formed

Last Answer : each step generates the reactive intermediate that causes the next step to occur

In multistage equilibrium conversion of SO2 to SO3 (2SO2 + O2 ⇌ 2SO3 ), the reverse reaction becomes appreciable at a temperature of 550° C. The percentage equilibrium conversion of SO2 to SO3 can be increased by (A) Increasing the oxygen concentration (B) Putting more quantity of V2O5 catalyst in the converter (C) Removing some quantity of SO3 during intermediate stage (D) Maintaining low temperature & pressure in the converter

Description : In multistage equilibrium conversion of SO2 to SO3 (2SO2 + O2 ⇌ 2SO3 ), the reverse reaction becomes appreciable at a temperature of 550° C. The percentage equilibrium conversion of SO2 to ... some quantity of SO3 during intermediate stage (D) Maintaining low temperature & pressure in the converter

Last Answer : (C) Removing some quantity of SO3 during intermediate stage

“The enthalpy change for any chemical reaction is independent of the intermediate stages, provided the initial and final conditions are the same for each route.” This statement is known as:

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In a photosynthesis reaction, chlorophyll is: w) a reactant w) a product y) a catalyst z) an intermediate

Description : In a photosynthesis reaction, chlorophyll is: w) a reactant w) a product y) a catalyst z) an intermediate

Last Answer : ANSWER: Y -- A CATALYST

Write the balanced chemical equations for the following reactions and identify the type of reaction in each case: -SST 10th

Description : Write the balanced chemical equations for the following reactions and identify the type of reaction in each case: -SST 10th

Last Answer : This is an example of combination reaction. A combination reaction is one in which or more reactants combine to form a single product (b) NaOH(aq)-CH3COOH(l) → CH3COONa(aq)+H2O(l) This is an ... is also an exothermic reaction as it evolves a lot of heat. It is also known as oxidation reaction.

What was Princess September’s reaction to the loss of her parrot? (ii) What was her Mother’s reaction to it? (iii) What do the reactions indicate about the nature and temperament of each? -English

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Last Answer : (i) Princess September took the loss of her parrot to heart. She wept continuously. She was put to sleep without supper. (ii) Her Mother said that Princess September's weeping was simply nonsense. She ... parrot died. But the Queen mother was not moved at all. She had nothing to console the child.

(a) What are fuel cells? Explain the electrode reactions involved in the working of H2 – O2 fuel cell. (b) Represent the galvanic cell in which the reaction Zn (s) + Cu2+ (aq) → Zn2+ (aq) + Cu (s) takes place. -Chemistry

Description : (a) What are fuel cells? Explain the electrode reactions involved in the working of H2 – O2 fuel cell. (b) Represent the galvanic cell in which the reaction Zn (s) + Cu2+ (aq) → Zn2+ (aq) + Cu (s) takes place. -Chemistry

Last Answer : (a) Fuel cells : These cells are the devices which convert the energy produced during combustion of fuels like H2, CH4, etc. directly into electrical energy. The electrode reaction for H2 – O2 fuel cell : (b) The galvanic cell may be represented as Zn (s) | Zn2+ (1M) || Cu2+ (1M) | Cu (s)

Two half-reactions of an electrochemical cell are given below : MnO–4 (aq) + 8H+ (aq) + 5e– → Mn2+ (aq) + 4H2O (I), E° = 1.51 V Sn2+ (aq) → Sn4+ (aq) + 2e–, E° = + 0.15 V. Construct the redox equation from the standard potential of the cell and predict if the reaction is reactant favoured or product favoured. -Chemistry

Description : Two half-reactions of an electrochemical cell are given below : MnO-4 (aq) + 8H+ (aq) + 5e- → Mn2+ (aq) + 4H2O (I), E° = 1.51 V Sn2+ (aq) → Sn4+ (aq) + 2e- ... the redox equation from the standard potential of the cell and predict if the reaction is reactant favoured or product favoured. -Chemistry

Last Answer : The reactions can be represented at anode and at cathode in the following ways : At anode (oxidation) : Sn2+ → = Sn4+ (aq) + 2e- ] 5 E° = + 0.15 V At cathode (reduction) : MnO-4(aq) + 8H+ ... = E°cathode - E°anode = 1.51 - 0.15 = + 1.36 V ∴ Positive value of E°cell favours formation of product.

Two half-reactions of an electrochemical cell are given below : MnO–4 (aq) + 8H+ (aq) + 5e– → Mn2+ (aq) + 4H2O (I), E° = 1.51 V Sn2+ (aq) → Sn4+ (aq) + 2e–, E° = + 0.15 V. Construct the redox reaction equation from the two half-reactions and calculate the cell potential from the standard potentials and predict if the reaction is reactant or product favoured. -Chemistry

Description : Two half-reactions of an electrochemical cell are given below : MnO-4 (aq) + 8H+ (aq) + 5e- → Mn2+ (aq) + 4H2O (I), E° = 1.51 V Sn2+ (aq) → Sn4+ (aq) + ... -reactions and calculate the cell potential from the standard potentials and predict if the reaction is reactant or product favoured. -Chemistry

Last Answer : The reactions can be represented at anode and at cathode in the following ways : At anode (oxidation) : Sn2+ → Sn4+ (aq) + 2e- ] 5 E° = + 0.15 V Af cathode (reduction) : MnO-4(aq) + 8H+ ( ... = E°cathode - E°anode = 1.51 - 0.15 = + 1.36 V ∴ Positive value of E°cell favours formation of product.

(a) Write the essential condition for the following reaction to take place: 2AgBr—-> 2Ag + Br2 Write one application of this reaction. (b) Complete the following chemical equation of a chemical reaction 2FeS04 — chemical-reactions-and-equations-chapter-wise-important-questions-class-10-science-5 (c) What happens when water is added to quick line. Write chemical equation. -Chemistry

Description : (a) Write the essential condition for the following reaction to take place: 2AgBr--> 2Ag + Br2 Write one application of this reaction. (b) Complete the following chemical equation of a chemical ... science-5 (c) What happens when water is added to quick line. Write chemical equation. -Chemistry

Last Answer : Answer. This reaction is used in photography. (c) Slaked lime is formed with hissing sound and lot of heat is envolved.

What is precipitation reaction ? Explain with reactions.

Description : What is precipitation reaction ? Explain with reactions.

Last Answer : A chemical reaction in which compounds are deposited on the bottom of a vessel as precipitation is called precipitation reaction. E.g . : - NaCl (aq) + AgNO3 (aq) ------> NaNO3 (aq) + AgCl

Assertion :- Entropy of system increases for a spontaneous reactions. Reason :- Enthalpy of reaction always decreases for spontaneous reaction.

Description : Assertion :- Entropy of system increases for a spontaneous reactions. Reason :- Enthalpy of reaction always decreases for spontaneous reaction.

Last Answer : Assertion :- Entropy of system increases for a spontaneous reactions. Reason :- Enthalpy of reaction ... D. If both Assertion & Reason are false.

In which of the following reactions,standard reaction entropy change`(DeltaS^(@))`is positive and standard Gibb,s energy change`(DeltaG^(@))`decreases

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Last Answer : In which of the following reactions,standard reaction entropy change`(DeltaS^(@))`is positive and standard Gibb,s ... (2)O_(2)(g)rarr CO_(2)(g)`