A) \[-\text{C}\equiv \text{N}\]
B) \[-\text{S}{{\text{O}}_{\text{3}}}\text{H}\]
C) \[-\text{COOH}\]
D) \[-\text{N}{{\text{O}}_{\text{2}}}\]
Correct Answer: D
Solution :
The deactivating tendency of given groups follows the order \[-N{{O}_{2}}>-S{{O}_{3}}H>-C\equiv N>-\overset{\begin{smallmatrix} O \\ || \end{smallmatrix}}{\mathop{C}}\,-OH\] Thus, ?\[N{{O}_{2}}\] is the most deactivating group.
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