STANDARDChemistry-Hydrocarbons
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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