Question

The order of reactivity of various alkyl halide towards the nucleophilic substitution follows the order:

• A. $RI>RBr>RCl>RF$
• B. $RF>RCl>RBr>RI$
• C. $RCl>RBr>RI>RF$
• D. $RBr>RI>RCl>RF$

Answer 1

Answer: (A)

$RI>RBr>RCl>RF$

The alkyl halides are very reactive due to highly polarised $CX$ bond with a large difference in electronegativities of carbon and halogen atoms.

The order of reactivity is iodide > bromides > chlorides > fluorides