Amine that cannot be prepared by Gabriel phthalimide synthesis is

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 Multiple Choice QuestionsMultiple Choice Questions

521.

Choose the incorrect statement.

  • Primary amines show intermolecular hydrogen bonds

  • Tert-butylamine is a primary amine

  • Tertiary amines do not show intermolecular hydrogen bonds

  • Isopropylamine is a secondary amine


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522.

Amine that cannot be prepared by Gabriel phthalimide synthesis is

  • aniline

  • benzylamine

  • methylamine

  • iso-butylamine


A.

aniline

Only aliphatic primary amines can be prepared by Gabriel synthesis. Aniline cannot be prepared by this method because aryl halides (C6H5Cl or C6H5Br) do not undergo nucleophilic substitution with potassium phthalimide under ordinary conditions to give N-phenyl phthalimide (ie, cleavage of CX bond in haloarenes is quite difficult).

             

(RX = aliphatic halide)


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523.

Which of the following is the least basic amine?

  • Ethylamine

  • Diethylamine

  • Aniline

  • Benzylamine


524.

The reaction of CHCl3 and alcoholic KOH with p-toluidine gives


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525.

The correct order of increasing basic nature of the following bases is

  • 2 < 5 < 1 < 3 < 4

  • 5 < 2 < 1 < 3 < 4

  • 2 < 5 < 1 < 4 < 3

  • 5 < 2 < 1 < 4 < 3


526.

Choose the amide which on reduction with LiAlH4 yields a secondary amine

  • ethanamide

  • N-methylethanamide

  • N, N-dimethylethanamide

  • phenylmethanamide


527.

Arrange the following amines in the decreasing order of their basic strength. Aniline (I), Benzylamine (II), p-toluidine (III)

  • I > II > III

  • II > III > I

  • III > II > I

  • II > I > III


528.

Which one of the following compounds will dissolve in an alkali solution after it has undergone reaction with Hinsberg reagent?

  • CH3NH2

  • (CH3)3N

  • (C2H5)2NH

  • C6H5NHC6H5


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529.

Identify the product in the following sequence 3,4,5 tribromoaniline (2) H3PO2(1) diazorization ?

  • 3, 4, 5-tribromobenzene

  • 1, 2, 3-tribromobenzene

  • 2, 4, 6-tribromobenzene

  • 3, 4, 5-tribromonitrobenzene


530.

Among the amines 

(A) C6H5NH2

(B) CH3NH2

(C) (CH3)3N

(D) (CH3)2NH

  • A < B < D <C

  • D < C < B <A

  • A > B > C >D

  • B < C < D <A


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