(i) Benzophenone → Diphenylmethane - (c) Zn(Hg)/Conc. HCl

(ii) Benzaldehyde → 1-Phenylethanol - (d) CH₃MgBr

(iii) Cyclohexanone → Cyclohexanol - (a) LiAlH₄

(iv) Phenyl benzoate → Benzaldehyde - (b) DIBAL—H

EXPLAINATION:

(i) Benzophenone is converted to Diphenylmethane by using Zn(Hg)/Conc. HCl. This is called Clemmensen reaction.

(ii) Benzaldehyde is converted to 1-Phenylethanol by using CH₃MgBr. This conversion basically uses grignard reagent followed by hydrolysis.

Benzaldehyde + CH₃MgBr + H₃O⁺

1-Phenylethanol

(iii) Cyclohexanone can be converted to cyclohexanol by a reducing agent like LiAlH₄.

LiAlH₄ is a strong reducing agent.

(iv) Phenyl benzoate can be converted to Benzaldehyde by reducing agent DIBAL—H.