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Arrange the following organic halides in correct order of reactivity towards \(\mathrm{S}_{\mathrm{N}} 2\) displacement.
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Verified Answer
The correct answer is:
\(Q > R > P\)
\(3^{\circ}\) alkyl halide (highly sterically hindered)
\(1^{\circ}\) alkyl halide (least sterically hindered)
(R) \(2^{\circ}\) alkyl halide
Rate of \(\mathrm{S}_{\mathrm{N}} 2\) reaction \(\propto \frac{1}{\text { sterically hindrance }}\)
\(\therefore\) Rate is \(1^{\circ} > 2^{\circ} > 3^{\circ}\) alkyl halide.
Hence, \(Q > R > P\) is correct answer.
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