See image — AITS & Test Series Chemistry Question

💡 Solution & Explanation

In compound (I), the two benzene rings are in different planes due to steric repulsions of methyl groups and hence, (I) is not as reactive as (II) towards EAS. Methyl group is more stable at the equatorial position as compared to the axial position and hence, both the compounds are not formed in equal quantities. When but-1-ene reacts with D2, we get a chiral carbon. The product formed is a racemic mixture, which can be resolved. During dehydration, carbocations are formed. The bridgehead carbocations are not stable, hence (V) is more reactive towards dehydration.