Question

Which of the statement given below is correct regarding aromatic eletrophilic substitution reaction of haloarene?

• A. As the size of the substituent increases the % of para product increases​
• B. As the size of the substituent increases the % of ortho product increases​
• C. As the size of the electrophile increases the % of para product decreases​
• D. All of the above

Answer 1

The correct option is A As the size of the substituent increases the % of para product increases​

Intermediates of electrophilic substitution reaction​:
In para substituted, $E^{+}$ and Y are apart so there is negligible interaction. ​

In ortho substituted, $E^{+}$ and Y are close so there is more interaction. ​

As the size of substituent increases, percentage of para product increases because $E^{+}$ and Y are apart so there is negligible interaction betweem them.​


The % of ortho and para product formed is depicted below in table with various electrophiles.

As the size of the substituent increases the % of para product increases.


The % of ortho and para product formed is depicted below in table with various substituents.


Hence the correct option is a.