Statement A is correct. Alcoholic KOH provides alkoxide ions which are stronger bases than hydroxide ions. Furthermore, alcohol is a less polar solvent than water, which decreases the solvation of the base, making it more effective for elimination reactions over substitution.
Statement B is incorrect. The reactivity towards the SN1 mechanism depends on the stability of the intermediate carbocation. The carbocation C6H5−C+H−C6H5 is more stable than C6H5−C+H2 due to extended resonance stabilization from two phenyl rings. Thus, C6H5−CHCl−C6H5 is more reactive than C6H5−CH2−Cl.
Statement C is incorrect. Aryl halides are much less reactive towards nucleophilic substitution than alkyl halides due to the partial double bond character of the C-X bond arising from resonance, as well as the sp2 hybridization of the carbon atom.
Statement D is incorrect. Allyl chloride (CH2=CH−CH2−Cl) contains a carbon-carbon double bond, making it a haloalkene, not a haloalkyne.
Statement E is correct. Alkyl chlorides (R−Cl) can be easily prepared from alcohols (R−OH) using SOCl2. However, phenols (Ar−OH) do not react with SOCl2 to give aryl chlorides because the C-O bond in phenol has a partial double bond character due to resonance, making it difficult to cleave.
Therefore, only statements A and E are correct.
Answer: A and E Only