Read the following passage and answer questions.

Nucleophiles attack at that part of the substrate molecule which is electron deficient. The reaction in which a nucleophile replaces already existing nucleophile in a molecule is called nucleophilic substitution reaction. Haloalkanes are substrates 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.

When $NH_3$ reacts with R-X, what is the major product?

Primary amine

The correct answer is Option (4) → Primary amine

When ammonia (NH₃) reacts with an alkyl halide (R–X), a nucleophilic substitution reaction occurs:

R–X+NH₃→R–NH₂+HX

• NH₃ acts as a nucleophile, attacking the alkyl halide (R–X)

• The halide ion (X⁻) is displaced

• The major product is a primary amine (R–NH₂)