Q.

x is the product which is obtained from propanenitrile and stannous chloride in the presence of hydrochloric acid followed by hydrolysis. y is the product which is obtained from the but-2-ene by the ozonolysis followed by hydrolysis. From the following, which product is not obtained when one mole of x and one mole of y react with each other in the presence of alkali followed by heating              [2026]

1 2-Methylbut-2-enal  
2 Pent-2-enal  
3 2-Methylpent-2-enal  
4 3-Methylbut-2-enal  

Ans.

(4)