Reaction of propanal with HCN followed by acid hydrolysis of the reaction product with produce

The reaction of acetaldehyde with HCN followed by hydrolysis gives a product which exhibits

The reaction of acetaldehyde with HCN followed by hydrolysis gives a product which exhibits

The reaction of acetaldehyde with HCN followed by hydrolysis gives a product which exhibits?

The structure of Oxirane is The reaction of Oxirane with RMgX followed by hydrolysis will lead to product ?