Haloalkanes and halo arenes practice · Easy

Option C (Racemic product) is correct because $S_N1$ reactions proceed through a carbocation intermediate, leading to racemization.

Option A ($RI$) is correct because as the size of the halogen increases, the van der Waals forces increase, leading to a higher boiling point.

Option C (Calcium hypochlorite) is correct because calcium hypochlorite, also known as bleaching powder, is used in the industrial preparation of chloroform from acetone.

Option D ((ii) $>$ (i) $>$ (iii) $>$ (iv)) is correct because the SN2 reaction rate depends on steric hindrance and the stability of the transition state. Benzyl halides are more reactive than methyl halides, and substituted aryl halides are the least reactive.

Option B ($\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{Br}+\mathrm{NaI} \stackrel{\text { Acetone }}{\longrightarrow} \mathrm{CH}_3 \mathrm{CH}_2 \mathrm{I}+\mathrm{NaBr}$) is correct because it represents the Finkelstein reaction, which involves the exchange of a halogen atom with an iodine atom in the presence of sodium iodide and acetone.