A) $ -C\equiv N $
B) $ -S{O_3}H $
C) $ -COOH $
D) $ -N{O_2} $
सही उत्तर: D
दिए गए समूहों की निष्क्रिय करने की प्रवृत्ति क्रम इस प्रकार है
$ -NO _2>-SO _3H>-C\equiv N>-\overset{\begin{smallmatrix} O \\ || \end{smallmatrix}}{\mathop{C}},-OH $
इस प्रकार, ? $ NO _2 $ सबसे अधिक निष्क्रिय करने वाला समूह है।
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