Which of the following does not give a stable | vedclass

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(D) Carbonyl compounds react with water to form gem-diols (hydrates). Usually,these are unstable and revert to the carbonyl compound. However,strong e

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$Ph-CHO$

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(D) Carbonyl compounds react with water to form gem-diols (hydrates). Usually,these are unstable and revert to the carbonyl compound. However,strong electron-withdrawing groups like $-CF_3$ or $-CCl_3$ stabilize the hydrate by increasing the electrophilicity of the carbonyl carbon through inductive effects. $CF_3-CO-CF_3$,$CF_3-CHO$,and $CCl_3-CHO$ form stable hydrates. Ninhydrin also forms a stable hydrate due to the presence of adjacent electron-withdrawing carbonyl groups. Benzaldehyde $(Ph-CHO)$ does not have such stabilizing groups,and its hydrate is unstable.

Column-$I$ (Reactants)	Column-$II$ (Products)
$(A)$ $HCHO + \text{Cyclohexyl-MgBr} \rightarrow X \xrightarrow{H_2O} Y$	$(i)$ $\text{Benzenesulfonic acid}$
$(B)$ $\text{2-oxocyclohexylacetate} \xrightarrow{NaBH_4}$	$(ii)$ $\text{Cyclohexylmethanol}$
$(C)$ $HCHO + CH_3-CH_2-CH(CH_3)-CH_2-MgBr \rightarrow X \xrightarrow{H_2O} Y$	$(iii)$ $\text{2-(2-hydroxycyclohexyl)acetate}$
$(D)$ $\text{Benzene} + \text{Oleum}$	$(iv)$ $Y = \text{3-methylpentan-1-ol}$

Which of the following does not give a stable product with water?

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