Product x is obtained by the Stephen reduction of propanenitrile (CH3CH2CN).
CH3CH2CNSnCl2/HClCH3CH2CH=NHH2OCH3CH2CHO (Propanal).
Product y is obtained by the reductive ozonolysis of but-2-ene (CH3CH=CHCH3).
CH3CH=CHCH3O3,H2O/Zn2CH3CHO (Ethanal).
When propanal (x) and ethanal (y) react in the presence of alkali followed by heating, they undergo cross-aldol condensation.
Possible products are:
Self-aldol of propanal: CH3CH2CHO+CH3CH2CHO→CH3CH2CH=C(CH3)CHO (2-Methylpent-2-enal).
Self-aldol of ethanal: CH3CHO+CH3CHO→CH3CH=CHCHO (But-2-enal).
Cross-aldol (Ethanal as nucleophile): CH3CH2CHO+CH3CHO→CH3CH2CH=CHCHO (Pent-2-enal).
Cross-aldol (Propanal as nucleophile): CH3CHO+CH3CH2CHO→CH3CH=C(CH3)CHO (2-Methylbut-2-enal).
Comparing with the options, 3-Methylbut-2-enal is not formed in any of these reactions.