CBSE Class 12 · 2010 · Delhi · Compounds Containing NitrogenShort Answer

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Rearrange the compounds as directed:
i) increasing basic strength: C₆H₅NH₂, C₆H₅N(CH₃)₂, (C₂H₅)₂NH and CH₃NH₂
ii) decreasing basic strength: aniline, p-nitroaniline and p-toluidine
iii) increasing pK_b values: C₂H₅NH₂, C₆H₅N(CH₃)₂, (C₂H₅)₂NH and C₆H₅NH₂

Solution

(i) Basicity rises:

C_{6} H_{5} N H_{2} < C_{6} H_{5} N (C H_{3})_{2} < C H_{3} N H_{2} < (C_{2} H_{5})_{2} NH

(ii) Donor –CH

_{3}

beats H beats acceptor –NO

_{2}

p - toluidine > aniline > p - nitroaniline

(iii) pK

_{b}

runs opposite to basicity:

(C_{2} H_{5})_{2} NH < C_{2} H_{5} N H_{2} < C_{6} H_{5} N (C H_{3})_{2} < C_{6} H_{5} N H_{2}

CBSE Class 12 Board · 2010 · Delhi · Subjective

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