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(A) Aldehydes that do not possess $\alpha$-hydrogen atoms,such as benzaldehyde $(C_6H_5CHO)$,undergo self-oxidation and reduction (disproportionation)

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$C_6H_5CHO$

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(A) Aldehydes that do not possess $\alpha$-hydrogen atoms,such as benzaldehyde $(C_6H_5CHO)$,undergo self-oxidation and reduction (disproportionation) when treated with concentrated alkali ($50\%$ aqueous $NaOH$).This reaction is known as the Cannizzaro reaction.It yields the corresponding alcohol (benzyl alcohol) and the salt of the corresponding acid (sodium benzoate).The reaction is: $2C_6H_5CHO + NaOH \rightarrow C_6H_5CH_2OH + C_6H_5COONa$.

Which one of the following on treatment with $50\%$ aqueous sodium hydroxide yields the corresponding alcohol and acid?

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