CBSE Class 12 · 2007 · All India · Compounds Containing NitrogenShort Answer

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Account for any two of the following:
a) Amines are basic substances while amides are neutral.
b) Aromatic amines are weaker bases than aliphatic amines.

Solution

(a) In R–CO–NH

_{2}

the nitrogen lone pair delocalises onto the carbonyl oxygen, so it cannot accept a proton — amides are neutral; in amines the lone pair is fully available — basic.
(b) Aromatic amines share the lone pair with the π-ring and their conjugate acids forfeit that resonance — so ArNH

_{2}

≪ RNH

_{2}

in basic strength.

CBSE Class 12 Board · 2007 · All India · Subjective

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