Which of the following statements are correct

Options

A. 1,3 dimethyl benzene is more reactive than 1,2 or 1,4-dimethyl benzene towards chlorination in HOAC
B. with n-propyl chloride in presence of AlClą, benzene gives n-propyl benzene as major product at `-6^(@)C`
C. The rate of nitration of `C_6D_6` is less than that of `C_6H_6`
D. sulphonation of benzene exhibits primary (hydrogen) isotopic effect

Answer

A, B, D

Explanation

a) The two `-CH_3` groups in 1,3-dimethyl benzene activate the same carbon. In the other two the two `-CH_3` groups activate different carbon atoms :

b) At -6°C, energy required for rearrangement of carbocations is not available to all. So major product is n-propyl benzene. A 35°C - isopropyl benzene is major product
d) Sulphonation of benzene exhibits pri isotopic

In this stage bond breaking requires more energy than Nitration does not exhibit isotopic effect