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JEE Main levelSingle correct optionDifficulty 2 of 3o2072

Which of the following is a propagation step in the free radical chlorination of ethane?

A $CH X_{3} CH X_{2} \cdot + CH X_{3} CH X_{2} \cdot CH X_{3} CH X_{2} CH X_{2} CH X_{3}$
B $Cl X_{2} h ν 2 Cl \cdot$
C $CH X_{3} CH X_{3} + Cl \cdot CH X_{3} CH X_{2} \cdot + HCl$
D $Cl \cdot + Cl \cdot Cl X_{2}$

Answer: C

A propagation step consumes one radical and generates another. Abstraction of H from ethane by

Cl \cdot

gives an ethyl radical, which continues the chain. The other equations are termination (the first two) or initiation (the last).

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