Chemistry - Halogen Derivative Question with Solution | TestHub

Question Explanation: Match each reaction with the type of reaction intermediate formed during the elimination/dehydration process.

Concept: This question is based on reaction intermediates: carbanion (E1cB), carbocation (E1), and transition state only (E2). Solution:

(A) –CF₃ is a strong –I group, which stabilizes a carbanion. The reaction proceeds via the E1cB mechanism, and the intermediate is a carbanion.

(B) Tertiary alcohol $+{\mathrm{H}}^{+}$$\to$ classic E1 reaction proceeds through a carbocation intermediate. Solution:

(C) Primary alkyl bromide + alcoholic KOH $\to$ E2 reaction. The E2 reaction proceeds through only a single transition state (no intermediate).

(D) Tertiary alkyl halide + KOH + heat $\to$ E2 reaction. The E2 reaction proceeds through only a single transition state (no intermediate).

Final Answer: A $\to$ r, B $\to$ q, C $\to$ p, D $\to$ p.