Two aliphatic aldehydes (P) and (Q) react in the presence of aqueous `K_(2)CO_(3)` to give compound (R ) which upon treatment with HCN gives compound(S). On acidification and heating, (S) gives the product shown below:
Compounds (P) and (Q), respectively, are:
A. `H_(3)C-overset(CH_(3))overset(|)(CH)-underset(O)underset(||)C-Hand H_(3)C-underset(O)underset(||)C-H`
B. `H_(3)C-overset(CH_(3))overset(|)(CH)-underset(O)underset(||)C-Hand HC-underset(O)underset(||)C-H`
C. `H_(3)-underset(CH_(3))underset(|)(CH)-CH_(3)-underset(O)underset(||)C-Hand H_(3)C-underset(O)underset(||)C-H`
D. `H_(3)C-underset(CH_(3))underset(|)(CH)-CH_(2)-underset(O)underset(||)C-H and H-underset(O)underset(||)C-H`
