| I. Lower the activation energy for the chain initiation step, more reactive is the halogen. |
| II. Lower the activation energy for the first chain propagation step, more reactive is the halogen. |
| III. Lower the activation energy for the, second chain propagation step, more reactive is the halogen. |
| IV. More negative is the overall heat of the reaction (\[\Delta H_{r}^{o}\] of halogenation of alkane) more reactive is the halogen. |
A) I and II
B) I, II and III
C) II and IV
D) II. Ill and IV
Correct Answer: C
Solution :
There are two factors that determine the reactivity of the halogenation of alkanes. (i) Lesser the positive value of \[{{E}_{act}}\] of the first chain propagating step, more reactive is the halogen. (ii) Higher the negative value of overall heat of reaction \[(\Delta H_{r}^{o})\], more reactive is the halogen. This explains high reactivity and explosive violence with which \[{{F}_{2}}\] reacts with \[C{{H}_{4}}\].
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