Question

The properties of carbonyl group is suppressed the most in

• A. $C{H}_{3}CHO$
• B. $C{H}_{3}COC{H}_3$
• C. $C{H}_{3}COOC{H}_3$
• D. $C{H}_{3}CON{H}_2$

Answer 1

Answer: (D)

The resonance structures for RCOG are



or

Electron-release from G(H, $C{H}_3,OC{H}_3$ or $N{H}_2$ ) to O stabilizes by diminishing the electrophilic character of carbonyl carbon. Since degree of delocalization is maximum in case of $-N{H}_2$ , therefore, the properties of is suppressed most in amides $(RCON{H}_2)$ .