IIT JEE Advanced 2010 Paper 2

Paragraph Type
This section contains 2 paragraphs. Based on each of the paragraphs, 3 multiple choice questions have to be answered. Each of these questions has 4 choices (A), (B), (C) and (D) out of which ONLY ONE is correct.
Paragraph for Questions 31–33:
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: