Which of the following statements about primary amines is false?

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 Multiple Choice QuestionsMultiple Choice Questions

641.

Method by which aniline cannot be prepared is 

  • hydrolysis phenyl isocyanide with the acidic solution

  • degradation of benzamide with bromine in alkaline solution

  • reduction of nitrobenzene with H2/Pd in ethanol

  • reduction of nitrobenzene with H2/Pd in ethanol

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642.

Which of the following compound is most basic?

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643.

The following reaction, 


is known by the name

  • Friedel -Crafts reaction

  • Perkins reaction

  • Acetylation reaction

  • Acetylation reaction

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644.

Which of the following statements about primary amines is false?

  • Alkyl amine are stronger bases than aryl amines

  • Alkyl amines reacts with nitrous acid to produce alcohols

  • Aryl amines react with nitrous acid to produce phenols

  • Alkyl amines are stronger base than ammonia


C.

Aryl amines react with nitrous acid to produce phenols

i) The presence of electron withdrawing substituent decrease the basicity while the presence of electron releasing substituent like, -CH3 - C2H5 etc increases the acidity.

ii) HNO2 converts - NH2 group of an aliphatic amine into - OH while that of aromatic amines into - N =NCl.

Since phneyl group is a electron withdrawing group, it decreases the basicity. Alkyl group, on the other hand, being electron releasing, increases the basicity. Thus, alkyl amines are more basic as compared to arylamines as well as ammonia.

R-NH2 HNO2 R -OH
Thus, HNO2 (nitrous acid ) converts alkyl amines to alcohols. But,

C6H5NH2 HNO2 C6H5N = NClbenzene diazonium chloride

Thus, HNO2 does not convert aryl amines into phenol.


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645.

Predict the product,


 

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646.

In a reaction of aniline, a coloured product C was obtained.

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647.

Which one of the following on reduction with lithium aluminium hydride yield a secondary amine?

  • Nitroethane

  • Methylisocyanide

  • Acetamide

  • Acetamide


648.

Which of the following is more basic than aniline?

  • Diphenylamine

  • Triphenylamine

  • p-nitroaniline

  • p-nitroaniline

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649.

The correct increasing order of basic strength for the following compounds is 

  • II < III < I 

  • III < I < II

  • III < II < I

  • III < II < I

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650.

Which of the following reactions is appropriate for converting acetamide to methanamine?

  • Carbylamine reaction

  • Hoffmann hypobromamide reaction

  • Stephens reaction

  • Stephens reaction

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