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

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

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"`

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

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

Last Answer : Carbocation is a reaction intermediate in which of the following reactions? A. `E_(1)` reactions B. ... ^(1))` reaction D. All of the above

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

`S_(N^(1))` mechanism for the hydrolysis of an alkyl halide involves the formation of intermediate:

Description : `S_(N^(1))` mechanism for the hydrolysis of an alkyl halide involves the formation of intermediate:

Last Answer : `S_(N^(1))` mechanism for the hydrolysis of an alkyl halide involves the formation of intermediate: ... B. carbocation C. carbanion D. none of these

(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.

Reaction involves isocyanate as intermediate porudct:

Description : Reaction involves isocyanate as intermediate porudct:

Last Answer : Reaction involves isocyanate as intermediate porudct: A. Curtius rearrangement B. Lossen ... C. Schmidt rearrangemnt D. Hofmann rearrangement

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

General mechanism of size reduction in intermediate and fine grinder is by (A) Cutting action (B) Compression (C) Compression and tearing (D) Impact and attrition

Description : General mechanism of size reduction in intermediate and fine grinder is by (A) Cutting action (B) Compression (C) Compression and tearing (D) Impact and attrition

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For location of soundings a range and one angle from the shore involves the following operations. Which one is correct? (A) A range line is established (B) The first and the last soundings and every tenth soundings are fixed by angular observations (C) The intermediate soundings are fixed by the time intervals (D) All the above

Description : For location of soundings a range and one angle from the shore involves the following operations. Which one is correct? (A) A range line is established (B) The first and the last soundings ... angular observations (C) The intermediate soundings are fixed by the time intervals (D) All the above

Last Answer : (D) All the above

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?

Last Answer : Which is most stable carbocation? A. n-Propyl cation B. Isopropyl cation C. Ethyl cation D. Triphenylmethyl cation

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

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

Last Answer : Carbon atom in methyl carbocation and methyl carbanion is _____ and ______ hybridised : A. `sp,sp^(2)` B. `sp^(3),sp ... 3),sp^(2)` D. `sp^(2),sp^(3)`

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:

Last Answer : Most stable carbocation is: A. `CH_(3)-overset(+)CH_(2)` B. `overset(+)CH_(2)CHCl_(2)` C. `overset(+)CH_ ... (2)Cl` D. `overset(+)CH_(2)-CH_(2)NO_(2)`

Which of the following statements is correct about a carbocation?

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

Last Answer : Which of the following statements is correct about a carbocation? A. It reacts with nucleophile B. It can ... )` to form an olefin D. All are correct

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

Description : 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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The mechanism of urine formation in nephron involves

Description : The mechanism of urine formation in nephron involves

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In extra hepatic tissues, one mechanism for utilization of acetoacetate involves (A) Malonyl-CoA (B) Succinyl-CoA (C) Propionyl-CoA (D) Acetyl-CoA

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Last Answer : Answer : B

The mechanism of action of cyclosporine involves (a) Activation of calcineurin (b) Binding to cyclophilin to cause inhibition of a cytoplasmic phosphatase (c) Blockade of interleukin – 2- receptors (d) Inhibition of phospholipase A2 (e) Suppression of bone marrow progenitors

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Last Answer : Ans: B

The mechanism of antibacterial action of tetracycline involves (a) Binding to a component of the 50S ribosomal subunit (b) Inhibition of translocase activity (c) Blockade of binding of aminoacyl – tRNA to bacterial ribosomes (d) Selective inhibition of ribosomal peptidyl transferases (e) Inhibition of DNA–dependent RNA polymerase

Description : The mechanism of antibacterial action of tetracycline involves (a) Binding to a component of the 50S ribosomal subunit (b) Inhibition of translocase activity (c) Blockade of binding of ... (d) Selective inhibition of ribosomal peptidyl transferases (e) Inhibition of DNA-dependent RNA polymerase

Last Answer : Ans: C

The mechanism of dehydration of an alcohol to give an ether involves formation of (a) Carbonium ions(b) Carbanions(c) Free radicals(d) Carbenes:

Description : The mechanism of dehydration of an alcohol to give an ether involves formation of : (a) Carbonium ions (b) Carbanions (c) Free radicals (d) Carbenes

Last Answer : Carbonium ions

The mechanism of dehydration of an alcohol to give an alkene involves formation of : (a) Carbonium ions (b) Carbanions (c) Free radicals (d) Carbenes

Description : The mechanism of dehydration of an alcohol to give an alkene involves formation of : (a) Carbonium ions (b) Carbanions (c) Free radicals (d) Carbenes

Last Answer : Carbonium ions

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Description : The mechanism by which neostigmine improves contraction of myasthenic muscle involves: A. Repetitive binding of the acetylcholine molecules to the same receptors at the muscle endplate B. Diffusion of ... Activation of motor end-plate receptors by neostigmine molecules themselves D. All of the above

Last Answer : D. All of the above

The mechanism by which neostigmine improves contraction of myasthenic muscle involves: A. Repetitive binding of the acetylcholine molecules to the same receptors at the muscle endplate B. Diffusion of acetylcholine released from motor nerve endings to a wider area activating neighbouring receptors C. Activation of motor end-plate receptors by neostigmine molecules themselves D. All of the above

Description : The mechanism by which neostigmine improves contraction of myasthenic muscle involves: A. Repetitive binding of the acetylcholine molecules to the same receptors at the muscle endplate B. Diffusion of ... Activation of motor end-plate receptors by neostigmine molecules themselves D. All of the above

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