A) \[RCl,\]and\[RBr\]but not\[R\text{ }F\]or \[R\text{ }I\]
B) \[RF,\text{ }RCl\]and \[R\text{ }Br\] but not\[R\text{ }I\]
C) \[RF,RCl,RBr,R\,I\]
D) \[RF,RCl\]and \[R\,I\]but\[RBr\]
Correct Answer: A
Solution :
\[RCl\]and\[RBr\]can be prepared by free radical halogenation of alkanes while\[-RF\]and\[-RI\] cannot be prepared. With\[{{F}_{2}},\]the reaction is not only explosive but also brings cleavage of \[C-C\]bonds while with\[{{I}_{2}}\]the reaction is too slow to be of any practical value.
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