Neet Solved Paper 2013 Question 38
Question: Some meta-directing substituents in aromatic substitution are given. Which one is most deactivating?
Options:
A) $ -C\equiv N $
B) $ -S{O_3}H $
C) $ -COOH $
D) $ -N{O_2} $
Show Answer
Answer:
Correct Answer: D
Solution:
The deactivating tendency of given groups follows the order
$ -NO _2>-SO _3H>-C\equiv N>-\overset{\begin{smallmatrix} O \\ || \end{smallmatrix}}{\mathop{C}},-OH $
Thus, ? $ NO _2 $ is the most deactivating group.
