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?
Answer & explanation
Correct answer: option 4
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
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NH₃ acts as a nucleophile, attacking the alkyl halide (R–X)
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The halide ion (X⁻) is displaced
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The major product is a primary amine (R–NH₂)