(A) Allyl free radical is more stable than simple alkyl free radical. (R) The allyl free radical is stabilized by resonance.

(A) Allyl free radical is more stable than simple alkyl free radical. (R) The allyl free radical is stabilized by resonance.
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(A) Allyl free radical is more stable than simple alkyl free radical. (R) The allyl free radical is ... IF (A) is incorrect but (R) is correct.
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Which of the following is not a correct statement concerning the FriedelCrafts acylation of benzene? (a) An alkyl group substitutes for a hydrogen. (b) The benzene ring attacks an acylium ion. (c) The acylium ion is resonance stabilized. (d) The acylium ion is often produced from an acyl chloride.

Description : Which of the following is not a correct statement concerning the FriedelCrafts acylation of benzene? (a) An alkyl group substitutes for a hydrogen. (b) The benzene ring attacks an acylium ion. (c) The acylium ion is resonance stabilized. (d) The acylium ion is often produced from an acyl chloride.

Last Answer : An alkyl group substitutes for a hydrogen

Why does a H+ ion attacking a carbon-carbon double bond add to the carbon with the least number of substituents? (a) the reaction is resonance stabilized. (b) the hybrid geometry favors this process. (c) nucleophile tends to attack stable centers of negative charge. (d) a more stable carbonium ion is generated.

Description : Why does a H+ ion attacking a carbon-carbon double bond add to the carbon with the least number of substituents? (a) the reaction is resonance stabilized. (b) the hybrid geometry favors this ... tends to attack stable centers of negative charge. (d) a more stable carbonium ion is generated.

Last Answer : a more stable carbonium ion is generated.

Assertion : Phenols are more acidic than aliphatic alcohols. Reason : Phenoxides are stabilized by resonance.

Description : Assertion : Phenols are more acidic than aliphatic alcohols. Reason : Phenoxides are stabilized by resonance.

Last Answer : Assertion : Phenols are more acidic than aliphatic alcohols. Reason : Phenoxides are stabilized by resonance. ... D. A is incorrect but R is correct

The alkyl radical in plasmalogen is an alcohol: (A) Saturated (B) Unsaturated (C) Both (A) and (B) (D) None of these

Description : The alkyl radical in plasmalogen is an alcohol: (A) Saturated (B) Unsaturated (C) Both (A) and (B) (D) None of these

Last Answer : Answer : A

Aryl halides are less reactive towards nucleophilic substitution as compared to alkyl halides due to (a) Inductive effect (b) Resonance stabilization (c) Tautomerism (d) Stereoisomerism

Description : Aryl halides are less reactive towards nucleophilic substitution as compared to alkyl halides due to (a) Inductive effect (b) Resonance stabilization (c) Tautomerism (d) Stereoisomerism

Last Answer : Resonance stabilization

Which of the following has two equatorial alkyl substituents in its most stable conformation? (a) 1,1-dimethylcyclohexane (b) cis-1,2-dimethylcyclohexane (c) cis-1,3-diethylcyclohexane (d) cis-1,4-diethylcyclohexane

Description : Which of the following has two equatorial alkyl substituents in its most stable conformation? (a) 1,1-dimethylcyclohexane (b) cis-1,2-dimethylcyclohexane (c) cis-1,3-diethylcyclohexane (d) cis-1,4-diethylcyclohexane

Last Answer : cis-1,3-diethylcyclohexane

(A) In allylic substitution propene gives allyl bromide. (R) NBS is a selective brominating agent and gives substitution at the alpha carbon with resp

Description : (A) In allylic substitution propene gives allyl bromide. (R) NBS is a selective brominating agent and gives substitution at the alpha carbon with resp

Last Answer : (A) In allylic substitution propene gives allyl bromide. (R) NBS is a selective brominating agent and gives ... (A) is incorrect but (R) is correct.

Which statement is true? (a) Resonance hybrids are inherently unstable. (b) Resonance hybrids are more stable than any individual resonance form. (c) Resonance hybrids are averages of all resonance forms resembling the less stable forms. (d) Resonance hybrids are averages of all resonance forms resembling the more stable forms.

Description : Which statement is true? (a) Resonance hybrids are inherently unstable. (b) Resonance hybrids are more stable than any individual resonance form. (c) Resonance hybrids are averages of all resonance ... forms. (d) Resonance hybrids are averages of all resonance forms resembling the more stable forms.

Last Answer : Resonance hybrids are averages of all resonance forms resembling the more stable forms.

Most stable radical is

Description : Most stable radical is

Last Answer : Most stable radical is A. `CH_(2)=overset(.)CH` B. `CH_(2)=CH-overset(.)CH_(2)` C. D.

What radical is the most stable?

Description : What radical is the most stable?

Last Answer : Need answer

Electron-withdrawing groups are meta directors because : (a) the carbonium ion intermediate has a negative charge on the meta position. (b) the more stable resonance hybrid occurs with meta attachment of the electrophile. (c) the less stable resonance hybrid occurs with meta attachment of the electrophile. (d) the carbonium ion intermediate has a positive charge on the meta position

Description : Electron-withdrawing groups are meta directors because : (a) the carbonium ion intermediate has a negative charge on the meta position. (b) the more stable resonance hybrid occurs with meta ... the electrophile. (d) the carbonium ion intermediate has a positive charge on the meta position

Last Answer : the more stable resonance hybrid occurs with meta attachment of the electrophile.

Among the following, the least stable resonance structure is :

Description : Among the following, the least stable resonance structure is :

Last Answer : Among the following, the least stable resonance structure is : A. B. C. D.

Which of the following is incorrect? (a) Resonance stabilization is the extra stability a compound gains from having delocalized electrons. (b) Delocalized electrons destabilize a compound. (c) The greater the number of relatively stable resonance contributors, the greater is the resonance stabilization(d) (a) and (c).

Description : Which of the following is incorrect? (a) Resonance stabilization is the extra stability a compound gains from having delocalized electrons. (b) Delocalized electrons destabilize a compound. (c) The greater ... stable resonance contributors, the greater is the resonance stabilization. (d) (a) and (c)

Last Answer : Delocalized electrons destabilize a compound

Arrange the following free radicals in order of decreasing stability: Methyl(I), Vinly(II), Allyl(III), Benzyl(IV)

Description : Arrange the following free radicals in order of decreasing stability: Methyl(I), Vinly(II), Allyl(III), Benzyl(IV)

Last Answer : Arrange the following free radicals in order of decreasing stability: Methyl(I), Vinly(II), Allyl(III), Benzyl(IV) ... gt III D. IV gt III gt I gt II

(A) Carbenes act as free radicals. (R) Only triplet carbenes act as biradical (divalent free radical).

Description : (A) Carbenes act as free radicals. (R) Only triplet carbenes act as biradical (divalent free radical).

Last Answer : (A) Carbenes act as free radicals. (R) Only triplet carbenes act as biradical (divalent free radical). A. ... IF (A) is incorrect but (R) is correct.

Assertion (A): Alkyl aryl ethers on reaction with HI give alkyl iodide phenols Reason (R): Aryl - oxygen bond is weaker than alkyl oxygen bond

Description : Assertion (A): Alkyl aryl ethers on reaction with HI give alkyl iodide phenols Reason (R): Aryl - oxygen bond is weaker than alkyl oxygen bond

Last Answer : Assertion (A): Alkyl aryl ethers on reaction with HI give alkyl iodide phenols Reason (R): Aryl - oxygen ... is false D. A is false but R is true

A country with a high rate of population growth took measures to reduce it. The figure below shows age-sex pyramids of populations A and B twenty years apart. Select the correct interpretation about them.(a) “B” is earlier pyramid and shows stabilized growth rate. (b) “B” is more recent showing that population is very young. (c) “A” is the earlier pyramid and no change has occurred in the growth rate. (d) “A” is more recent and shows slight reduction in the growth rate.

Description : A country with a high rate of population growth took measures to reduce it. The figure below shows age-sex pyramids of populations A and B twenty years apart. Select the correct interpretation about them. ... the growth rate. (d) A is more recent and shows slight reduction in the growth rate.

Last Answer : (d) “A” is more recent and shows slight reduction in the growth rate.

Compound P on treatement with `CH_(2)N_(2)` (diazomethane) produces compound Q. compound Q on reaction with Hl produces two alkyl iodides R and S . Al

Description : Compound P on treatement with `CH_(2)N_(2)` (diazomethane) produces compound Q. compound Q on reaction with Hl produces two alkyl iodides R and S . Al

Last Answer : Compound P on treatement with `CH_(2)N_(2)` (diazomethane) produces compound Q. compound Q on reaction ... 2-methyl-2-propanol D. 2-methyl-1-propanol

Mercaptans is represented as (where R and R' are alkyl groups) (A) R-COOH (B) R-S-H (C) R-S-R (D) R-S-R'

Description : Mercaptans is represented as (where R and R' are alkyl groups) (A) R-COOH (B) R-S-H (C) R-S-R (D) R-S-R'

Last Answer : (B) R-S-H

after its political system stabilized, what was south africa’s government able to do?

Description : after its political system stabilized, what was south africa’s government able to do?

Last Answer : govern a state or community

The pH of body fluids is stabilized by buffer systems. The compound which will be the most effective buffer at physiologic pH is (A) Na2HPO4 pKa = 12.32 (B) Na2HPO4 pKa=7.21 (C) NH4OH pKa = 7.24 (D) Citric acid pKa = 3.09

Description : The pH of body fluids is stabilized by buffer systems. The compound which will be the most effective buffer at physiologic pH is (A) Na2HPO4 pKa = 12.32 (B) Na2HPO4 pKa=7.21 (C) NH4OH pKa = 7.24 (D) Citric acid pKa = 3.09

Last Answer : Answer : B

α-helix is stabilized by (A) Hydrogen bonds (B) Disulphide bonds (C) Salt bonds (D) Non-polar bonds

Description : α-helix is stabilized by (A) Hydrogen bonds (B) Disulphide bonds (C) Salt bonds (D) Non-polar bonds

Last Answer : Answer : A

(2) stabilise the colloid and prevent crystallisation Explanation: Gelatine, being a colloid, has the property of preventing crystallization. In ice lollies and icecream this is demonstrated by the formation of a very fine crystal structure on freezing. This goes much further in that gelatine stabilized icecream does not become grainy or sandy due to the slow crystallisation of lactose with time.

Description : (2) stabilise the colloid and prevent crystallisation Explanation: Gelatine, being a colloid, has the property of preventing crystallization. In ice lollies and icecream this is demonstrated by the formation ... does not become grainy or sandy due to the slow crystallisation of lactose with time.

Last Answer : Glycol is added to aviation gasoline because it - (1) reduces evaporation of petrol (2) increases efficiency of petrol (3) prevents freezing of petrol (4) reduces consumption of petrol

Which one of the following rollers is suitable for soil-cement stabilized road construction? (a) Vibratory roller (b) Sheepfoot roller (c) Pneumatic roller (d) Smooth wheel roller

Description : Which one of the following rollers is suitable for soil-cement stabilized road construction? (a) Vibratory roller (b) Sheepfoot roller (c) Pneumatic roller (d) Smooth wheel roller

Last Answer : (c) Pneumatic roller

What is Allyl ?

Description : What is Allyl ?

Last Answer : : The short form of allelomorph is allele. One of the pairs of genes that control the specific characteristics of an organism located in a specific locus of homologous chromosome pairs is called the allele of the other.

Which of the following can undergo nucleophilic substitution under ordinary conditions? I Allyl chloride II Benzyl chloride III n-Propyl chloride IV V

Description : Which of the following can undergo nucleophilic substitution under ordinary conditions? I Allyl chloride II Benzyl chloride III n-Propyl chloride IV V

Last Answer : Which of the following can undergo nucleophilic substitution under ordinary conditions? I Allyl chloride II ... are correct D. I and III are correct

How many of the following compounds would give turbidity with lucas reagent without heating (1) Benzyl alcohol (2) Allyl alcohol (3) Cyclohexanol (4)

Description : How many of the following compounds would give turbidity with lucas reagent without heating (1) Benzyl alcohol (2) Allyl alcohol (3) Cyclohexanol (4)

Last Answer : How many of the following compounds would give turbidity with lucas reagent without heating (1) ... methyl carbionol (9) P-Nitro benzyl alcohol

Orlon is prepared by the polymerisation of (a) Vinyl cyanide (b) Allyl alcohol (c) Vinyl chloride (d) Allyl chloride

Description : Orlon is prepared by the polymerisation of (a) Vinyl cyanide (b) Allyl alcohol (c) Vinyl chloride (d) Allyl chloride

Last Answer : Vinyl cyanide

Which of the following reagents can be used to distinguish between chlorobenzene and allyl chloride? (a) H2/Ni(b) Br2 in CCl4(c) Zn/HCl(d) NH2NH2

Description : Which of the following reagents can be used to distinguish between chlorobenzene and allyl chloride? (a) H2/Ni (b) Br2 in CCl4 (c) Zn/HCl (d) NH2NH2

Last Answer : Br2 in CCl4

When glycerol is heated with potassium hydrogen sulfate (KHSO4), it forms (a) Acrolein (b) Acetic acid (c) Allyl alcoho(d) Propionic acidl

Description : When glycerol is heated with potassium hydrogen sulfate (KHSO4), it forms (a) Acrolein (b) Acetic acid (c) Allyl alcohol (d) Propionic acid

Last Answer : Acrolein

When glycerol is heated with oxalic acid at 260°C, it gives (a) 1,2-Propanediol (b) Vinyl alcohol (c) 1,3-Propanediol (d) Allyl alcohol

Description : When glycerol is heated with oxalic acid at 260°C, it gives (a) 1,2-Propanediol (b) Vinyl alcohol (c) 1,3-Propanediol (d) Allyl alcohol

Last Answer : Allyl alcohol

Which of the following compounds will give a white precipitate with alcoholic AgNO3? (a) Vinylbenzene (b) Chlorobenzene (c) Vinyl chloride (d) Allyl chloride

Description : Which of the following compounds will give a white precipitate with alcoholic AgNO3? (a) Vinylbenzene (b) Chlorobenzene (c) Vinyl chloride (d) Allyl chloride

Last Answer : Allyl chloride

Propene reacts with HBr in the presence of a peroxide to give (a) n-Propyl bromide (b) Allyl bromide (c) Isopropyl bromide (d) Vinyl bromide

Description : Propene reacts with HBr in the presence of a peroxide to give (a) n-Propyl bromide (b) Allyl bromide (c) Isopropyl bromide (d) Vinyl bromide

Last Answer : n-Propyl bromide

Pungency in Onion is due to presence of a. Diallyl disulphide b. Isothiocyanate c. Capsaicin d. Allyl propyl disulphide

Description : Pungency in Onion is due to presence of a. Diallyl disulphide b. Isothiocyanate c. Capsaicin d. Allyl propyl disulphide

Last Answer : d. Allyl propyl disulphide

Largest pre-emergence herbicide for weed control in citrus and pineapple orchards a). Atrazine b). Metham c). Allyl d). All

Description : Largest pre-emergence herbicide for weed control in citrus and pineapple orchards a). Atrazine b). Metham c). Allyl d). All

Last Answer : b). Metham

Herbicide commonly available as fumigant is a). Methyl bromide b). Metham c). Allyl alcohol d). All of these

Description : Herbicide commonly available as fumigant is a). Methyl bromide b). Metham c). Allyl alcohol d). All of these

Last Answer : d). All of these

In L-C-R series circuit suppose `omega_(r)` is resonance frequency, then match the following table, `{:(,,"Table-1",,"Table-2"),(,(A),"If " omegagtome

Description : In L-C-R series circuit suppose `omega_(r)` is resonance frequency, then match the following table, `{:(,,"Table-1",,"Table-2"),(,(A),"If " omegagtome

Last Answer : In L-C-R series circuit suppose `omega_(r)` is resonance frequency, then match the following table, `{:(,,"Table ... are in phase"),(,,,(T),"None"):}`

M.R.I. stands for - (1) Metered Resonance Imaging (2) Magnetic Resonance Imaging (3) Magnetic Reaction Imaging (4) Metered Reaction Imaging

Description : M.R.I. stands for - (1) Metered Resonance Imaging (2) Magnetic Resonance Imaging (3) Magnetic Reaction Imaging (4) Metered Reaction Imaging

Last Answer : (2) Magnetic Resonance Imaging Explanation: Magnetic Resonance Imaging (MRI) is a medical imaging technique used in radiology to visualize internal structures of the body in detail. MRT makes ... in the body, and radio frequency fields to systematically alter the alignment of this magnetization.

What does the symbol R in electricity stand for? (1) Refraction (2) Resonance (3) Rarefaction (4) Resistance

Description : What does the symbol R in electricity stand for? (1) Refraction (2) Resonance (3) Rarefaction (4) Resistance

Last Answer : (4) Resistance Explanation: In electricity, R stands for resistance, the property of an electric circuit or part of a circuit that transforms electric energy into heat energy in opposing electric current.

M.R.I. stands for (1) Metered Resonance Imaging (2) Magnetic Resonance Imaging (3) Magnetic Reaction Imaging (4) Metered Reaction Imaging

Description : M.R.I. stands for (1) Metered Resonance Imaging (2) Magnetic Resonance Imaging (3) Magnetic Reaction Imaging (4) Metered Reaction Imaging

Last Answer : Magnetic Resonance Imaging

State condition for resonance in R-L-C series circuit.

Description : State condition for resonance in R-L-C series circuit.

Last Answer : The condition for resonance in R-L-C series circuit. i) Inductive Reactance should be equal to capacitive reactance. That is XL = XC ii) The power factor of the circuit is Cos ɸ = 1 iii)The voltage and ... and given by I =V/R. v)Impedance of the circuit is minimum and given by Z =R.

Draw series R-L-C circuit and describe resonance.

Description : Draw series R-L-C circuit and describe resonance. 

Last Answer : Series R-L-C circuit:  Explanation of Series R-L-C Resonance circuit: A series circuit containing resistance, inductance and capacitance, is said to be resonant when the circuit power ... , and as we are analyzing a series RLC circuit this resonance frequency produces a Series Resonance.

In an R-C-L series circuit, during resonance, the impedance will be _____.

Last Answer : In an R-C-L series circuit, during resonance, the impedance will be minimum.

In R-L-C series resonant circuit magnitude of resonance frequency can be changed by changing the value of?

Description : In R-L-C series resonant circuit magnitude of resonance frequency can be changed by changing the value of?

Last Answer : In R-L-C series resonant circuit magnitude of resonance frequency can be changed by changing the value of L or C.

Magnitude of current at resonance in R-L-C circuit?

Description : Magnitude of current at resonance in R-L-C circuit?

Last Answer : The current will be maximum if it is a series rlc circuit.

The power factor at resonance in R-L- C parallel circuit is?

Description : The power factor at resonance in R-L- C parallel circuit is?

Last Answer : since a rlc circuit at resonance behaves like a pure resistive circuit, i.e there is no phase difference between current and voltage, hence the power factor is unity.

Which of the following statements concerning SN2 reactions of alkyl halides is not correct? (a) The rate of reaction depends on the concentration of the nucleophile. (b) The rate of reaction depends on the concentration of the alkyl halide. (c) The rate of reaction of a particular alkyl bromide depends on the steric accessibility of the carbon of the C-Br bond. (d) All alkyl iodides react more rapidly than all alkyl chlorides

Description : Which of the following statements concerning SN2 reactions of alkyl halides is not correct? (a) The rate of reaction depends on the concentration of the nucleophile. (b) The rate of reaction depends on the ... carbon of the C-Br bond. (d) All alkyl iodides react more rapidly than all alkyl chlorides

Last Answer : All alkyl iodides react more rapidly than all alkyl chlorides

What is Free Radical ?

Description : What is Free Radical ?

Last Answer : Free radical: Any species with odd electrons is called free radical.

What is Free Radical ?

Description : What is Free Radical ?

Last Answer : : An atom or radical with an odd electron resulting from the equilibrium-breaking of a covalent sigma bond is called a free radical.

What is free radical ?

Description : What is free radical ?

Last Answer : : An atom or radical with an odd electron resulting from the equilibrium-breaking of a covalent sigma bond is called a free radical.