A) \[RCl,\]and\[RBr\]but not RP or\[RI\]
B) \[RF,RCl\]and\[RBr\]but not\[RI\]
C) \[RF,\text{ }RCl,\text{ }RBr,\text{ }RI\]
D) \[RF,RCl\]and\[RI\]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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