The reaction in which a nucleophile replaces already existing nucleophile in a molecule is called nucleophilic substitution reaction. Haloalkanes are substrate in these reactions. In this type of reaction, a nucleophile reacts with haloalkane (the substrate) having a partial positive charge on the carbon atom bonded to halogen. A substitution reaction takes place and halogen atom, called leaving group departs as halide ion. Since the substitution reaction is initiated by a nucleophile, it is called nucleophilic substitution reaction.

It is one of the most useful classes of organic reactions of alkyl halides in which halogen is bonded to sp3 hybridized carbon.

What is the final product when ethyl bromide reacts with potassium phthalimide followed by acid hydrolysis?

Phtahlic acid + Ethyl amine 

The correct answer is option 2. Phtahlic acid + Ethyl amine.

Ethyl bromide reacts with potassium phthalimide followed by acid hydrolysis to produce Phtahlic acid and ethyl amine