Predict the product formed when cyclohexanecarbaldehyde reacts with following reagents :
(I ) PhMgBr and then ` H_2O^+` (ii ) Tollen's ethanool and acid
(v ) Zinc amalgam and dilute hydrochoric acid

Explanation

To predict the products formed when cyclohexanecarbaldehyde reacts with the given reagents, we will analyze each reaction step-by-step.

### Step 1: Reaction with PhMgBr followed by H2O
1. **Identify the Reactants**: Cyclohexanecarbaldehyde (C6H11CHO) is an aldehyde. The Grignard reagent PhMgBr is a strong nucleophile.
2. **Nucleophilic Attack**: The nucleophilic phenyl group (Ph-) from PhMgBr attacks the electrophilic carbon of the carbonyl group (C=O) in cyclohexanecarbaldehyde. This results in the formation of a tetrahedral intermediate.
3. **Formation of Alkoxide**: The tetrahedral intermediate collapses, leading to the formation of an alkoxide ion (C6H11C(OH)(Ph)).
4. **Hydrolysis**: When the alkoxide is treated with water (H2O), it is protonated to form the corresponding alcohol.
5. **Final Product**: The final product after hydrolysis is 1-phenylcyclohexanol (C6H11C(OH)(Ph)).
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