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Q.

Which of the following statements regarding free radical halogenation of alkane is not true

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a

 Hydrogen abstraction by halogen radical in the propagation step is  exothermic in both chlorination and bromination.  

b

 Hydrogen abstraction by halogen radical in propagation step is  exothermic in chlorination but endothermic in bromination.

c

A single halogen radical may bring about halogenation of thousands of alkane molecules

d

Continuous source of energy is required to continue the free radical halogenation reaction.

answer is B.

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Detailed Solution

 Propagation is exothermic in chlorination but endothermic in bromination.it can seen from energy profile diagrams

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