Give reasons:
a) Methylamine is a stronger base than ammonia.
b) The reactivity of the –NH₂ group is reduced in acetanilide.
a) Methylamine is a stronger base than ammonia.
b) The reactivity of the –NH₂ group is reduced in acetanilide.
Solution
(a) The methyl group's +I effect raises electron density on nitrogen and spreads the charge of the methylammonium ion — CHNH > NH.
(b) In CHNH–COCH the nitrogen lone pair conjugates with the carbonyl; the N is left electron-poor, so both its basicity and its ring-activating power fall sharply.
(b) In CHNH–COCH the nitrogen lone pair conjugates with the carbonyl; the N is left electron-poor, so both its basicity and its ring-activating power fall sharply.
CBSE Class 12 Board · 2005 · All India Compartment; also All India Compartment 2006 · Subjective