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BITSAT 2019
Exam
BITSAT
Year
2019
Subject
Chemistry
Chapter
Haloalkanes and Haloarenes

BITSAT 2019 · Chemistry · Haloalkanes and Haloarenes

Identify compound (C) in the following reaction C _ 7 H _ 8 3 Cl _...

Identify compound (C)\left(C\right) in the following reaction

C7H8→3Cl2/Δ(A){C}_{7}{H}_{8}\overset{3{Cl}_{2} / \Delta}{\to}\left(A\right)\overset{{Br}_{2} / Fe}{\to}\left(B\right)→Zn/HCl(C)\overset{Zn / HCl}{\to}\left(C\right)

Identify compound (C) in the following reaction C _ 7 H _ 8 3 Cl _ 2 / Δ → (A) Br _ 2 / Fe → (B) Zn / HCl → (C)

Options

  1. Aoo-bromotoluene
  2. Bmm-bromotoluene
  3. Cpp-bromotoluene
  4. D33-bromo, 2,4,62, 4, 6 trichlorotoluene

Correct answer

B. mm-bromotoluene

Step-by-step solution

Side chain hydrogen atoms are substituted by halogens in presence of light or heat by free radical mechanism. Ring hydrogens are substituted in presence of Lewis acid by electrofile. Alkyl halide (R-X) are reduced by Zn/HCl into alkane.

The degree of unsaturation for compound C7H8{C}_{7}{H}_{8} is three \left(3\right),asitreactswith, as it reacts with{Cl}_{2} / \Delta .HenceHence{C}_{7}{H}_{8}istoluene,i.eis toluene, i.e{C}_{6}{H}_{5} . {CH}_{3} . The whole reaction occurs as follows:

Identify compound (C) in the following reaction C _ 7 H _ 8 3 Cl _ 2 / Δ → (A) Br _ 2 / Fe → (B) Zn / HCl → (C)

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