Consider the following four compounds \ Choose the correct statement(s).\

Question

Professor PC Thomas Classes · Answer

(c, d) : Out of the given structures, IV is most basic as in IV due to steric inhibition to resonance, the lone pair of nitrogen is not in a plane of benzene so, lone pair is free for protonation.\ In amines, basicity increases if groups attached have $+I$ and $+M$-effect while basicity decreases if groups attached have $-I$ and $-M$-effect. Thus, II ( $+I$-effect) is more basic than I and III ( $-I$-effect) is less basic than I.\ Thus, basicity order is: IV $>$ II $>$ I $>$ III.\