Question

Which is the most likely group for substituent ' \( X \) ' based on the relative rate factors for chlorination in the given compound. 

(A) \( - CF _{3} \) 

(B) \( - C \left( CH _{3}\right)_{3} \) 

(C) \( - CH _{3} \) 

(D) \( - CH = O \)

Answer 1

The rate of chlorination depends on the stability of carbocation.

\(\oplus CF_3\), \(\oplus CH_3\),\(\oplus C(CH_3)\) and \(\oplus\overset{O}{\overset{||}C}-H\) 

We know that 3° carbocation is highly stabilized by hyper conjugations.

There X - C(CH₃)₃ give relatively high rate of chlorination.