Two aliphatic aldehydes P and| Chemistry| JEE Advanced 2010

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Two aliphatic aldehydes P and Q react in the presence of aqueous $\mathrm{K}_2 \mathrm{CO}_3$ to give compound R , which upon treatment with HCN provides compound S . On acidification and heating, S gives the product shown below:

The compound R is

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B

C

D

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