The correct IUPAC name of the following compound is :

The major product (P) of the given reaction is

(where, Me is $$-$$CH₃)

In the above reaction 'A' is

Isobutyraldehyde on reaction with formaldehyde and K₂CO₃ gives compound 'A'. Compound 'A' reacts with KCN and yields compound 'B', which on hydrolysis gives a stable compound 'C'. The compound 'C' is