IIT JEE Advanced 2010 Paper 2

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Two aliphatic aldehydes P and Q react in the presence of aqueous K2CO3 to give compound R, which upon treatment with HCN provides compound S. On acidification and heating, S gives the products shown below:
Section: Chemistry
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Question : 32 of 57
 
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The compound R is
[JEE Adv 2010 P2]
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