Question

What is the correct order of o/p ratio when $E^{+}$ attacks the following system?
$\underset{A}{PhF}$, $\underset{B}{PhCl}$, $\underset{C}{PhBr}$, $\underset{D}{PhI}$

• A. A $<$ B $<$ C $<$ D
• B. A $=$ B $=$ C $=$ D
• C. D $<$ C $<$ B $<$ A
• D. D $<$ B $<$ A $<$ C

Answer 1

The correct option is A A $<$ B $<$ C $<$ D

The formation of ortho & para product depends on the $-I$ effect of halogens.

The higher the $-I$ effect,the higher percentage of ortho product will be formed.here higher will be the O/P ratio.

There fore,the O/P ratio follows the order $A<B<C<D$.