Predict the major organic product formed when the compound shown below undergoes a reaction with lialh4. draw only the product with the longest chain of contiguous c atoms.

LiAlH₄ is used as strong reducing agent. The hydride produced acts as a nucleophile and attacks the electrophillic carbon of carbonyl group. In given example two reactions are observed.

Reaction 1:
                 In first step LiAlH₄ when treated with Ester produces corresponding Aldehyde and alcohol.

Reaction 2:
                This aldehyde produced further reacts with LiAlH₄ to give a reduced product (Alcohols). In this case Butanol is produced.

The reaction schemes are shown as felow,