Identify the (X), (Y), and (Z) in the following reactions
`PhCH_(2)Br+PhCH=CHCHOunderset("(ii) ":B^(Theta))overset("(i) "Ph_(3)P)rarr(Z)`

Explanation

To solve the problem, we need to identify the compounds (X), (Y), and (Z) in the given reaction sequence:

1. **Identify (X)**: The first compound in the reaction is PhCH₂Br. This compound is a benzyl bromide, where Ph represents the phenyl group (C₆H₅). Therefore, we can denote:
- (X) = PhCH₂Br

2. **Identify (Y)**: The second compound in the reaction is PhCH=CHCHO. This compound is an α,β-unsaturated aldehyde with a phenyl group. Thus, we can denote:
- (Y) = PhCH=CHCHO

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