Question:
Which of the following haloalkanes is most reactive towards S$_N$2 reaction ?
Which of the following haloalkanes is most reactive towards S$_N$2 reaction ?
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Better leaving group → faster S$_N$2.
Updated On: Jan 14, 2026
- CH$_3$–CH$_2$–I
- CH$_3$–CH$_2$–Br
- CH$_3$–CH$_2$–Cl
- CH$_3$–CH$_2$–F
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The Correct Option is A
Solution and Explanation
In S$_N$2 reactions, the leaving group ability is key.
Iodide ion (I$^-$) is the best leaving group among halides.
Thus, ethyl iodide is most reactive towards S$_N$2.
Iodide ion (I$^-$) is the best leaving group among halides.
Thus, ethyl iodide is most reactive towards S$_N$2.
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