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STANDARD Chemistry Free Radical Halogenation MCQ Question

Type: MCQ-conceptual-Medium-Class 11

Which step is chain propagation step in the following mechanism? (i) Cl₂ → hν → Cl• + Cl• (ii) Cl• + CH₄ → •CH₃ + HCl (iii) Cl• + Cl• → Cl₂ (iv) •CH₃ + Cl → CH₃Cl

A

(i)

B

(ii)

C

(iii)

D

(iv)

Correct Answer

Option B

Detailed Explanation

Chain propagation steps involve the reaction of radicals with stable molecules to form new radicals. In this case, Cl• + CH₄ → •CH₃ + HCl is a propagation step as it generates a new radical.

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