The correct order of increasing basic nature for the bases NH3, C

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581.

Which one of the following forms propane nitrile as the major product?

  • Ethyl bromide + alcoholic KCN

  • Propyl bromide + alcoholic KCN

  • Propyl bromide + alcoholic AgCN

  • Ethyl bromide + alcoholic AgCN


582.

Benzylamine is a stronger base than aniline because

  • the lone pair of electrons on the nitrogen atom in aniline is delocalised

  • the lone pair of electrons on the nitrogen atom in aniline is not involved in resonance

  • benzylamine has a higher molecular mass than aniline

  • the lone pair of electrons on the nitrogen atom in benzylamine is delocalised


583.

Which of the following pairs are correctly matched?
  Reactants Products
(i) RX+ AgOH (aq) RH
(ii) RX + AgCN (alc) RNC
(iii) RX + KCN(alc) RNC
(iv) RX + Na(ether) R-R

  • only I

  • I and II

  • II and III

  • II and IV


584.

Which one of the following gives amine on heating with amide?

  • Br2 in aqueous KOH

  • Br2 on alcoholic KOH

  • Cl2 in sodium

  • sodium in ether


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585.

In the given set of reactions, 2-bromopropane Alc./HeatAgCN X LiAlH4 Y. The IUPC name of product Y is

  • N-methylpropanamine

  • N-isopropylmethanamine

  • Butan-2-amine

  • N-methylpropan-2-amine


586.

One of the following amide will not undergo Hofmann bromamide reaction

  • CH3CONH2

  • CH3CONHCH3

  • C6H5CONH2

  • CH3CH2CONH2


587.

In the following sequence of reactions,

Reduction B HNO2 CH3CH2OH

The compound A is

  • propane nitrile

  • ethane nitrile

  • CH3NO2

  • CH3NC


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588.

The correct order of increasing basic nature for the bases NH3, CH3NH2 and (CH3)2NH in aqueous solution

  • CH3NH2 < NH3 < (CH3)2NH

  • NH< CH3NH<(CH3)2NH

  • CH3NH< (CH3)2NH < NH3

  • (CH3)2NH < NH<CH3NH


B.

NH< CH3NH<(CH3)2NH

If the alkyl group is bigger than CH3 group, there is steric hindrance to H-bonding and hence + I effect predommates over H-bonding 2 > 3 > 1. There is an important role of the inductive effect, solvation effect and steric hindrane of alkyl group. Which decide the basic strength of alkyl amine in the aqueous state

(CH3)2NH > CH3NH2 > NH3


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589.

Galbriel phthalimide synthesis is used in the preparation of primary amine from phthalimide, which of the following reagent is not used during the process?

  • KOH

  • NaOH

  • HCl

  • Alkyl halides


590.

High basicity of Me2NH relative to Me3N is attributed to :

  • effect of solvent

  • inductive effect of Me

  • shape of Me2NH

  • shape of Me3N


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