Benzene and Alkyl Benzene - Result Question 47

####51. Arrange the following in increasing order of reactivity towards sulphonation with fuming sulphuric acid.

Benzene, toluene, methoxy benzene, chlorobenzene.

(1988, 1M)

Show Answer

Solution:

  1. Both $-CH _3$ and $-OCH _3$ are activating groups but chloro is deactivating group in electrophilic aromatic substitution reaction.

Also $-OCH _3$ activate more than $-CH _3$ due to resonance effect by the former group. Therefore, the overall order of reactivity is:

Chlorobenzene $<$ benzene $<$ toluene $<$ methoxy benzene



NCERT Chapter Video Solution

Dual Pane