A) \[RCl,\] and \[RBr\] but not RF or \[RI\]
B) \[RF,RCl\] and \[R\,Br\] 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 \[{{\text{I}}_{\text{2}}}\] the reaction is too slow to be of any practical value.
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