Question:
Consider the following organic halides:
(I) Bromobenzene,
(II) 2-Bromopropane,
(III) 1-Bromopropane.
The correct order of reactivity towards \(S_N2\) reaction is:
Consider the following organic halides:
(I) Bromobenzene,
(II) 2-Bromopropane,
(III) 1-Bromopropane.
The correct order of reactivity towards \(S_N2\) reaction is:
(I) Bromobenzene,
(II) 2-Bromopropane,
(III) 1-Bromopropane.
The correct order of reactivity towards \(S_N2\) reaction is:
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Steric hindrance is the primary factor limiting the rate of \(S_N2\) reactions.
Updated On: Jun 9, 2026
- \(I > II > III\)
- \(III > II > I\)
- \(II > III\)
- \(III > II\)
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The Correct Option is B
Solution and Explanation
Concept:
The \(S_N2\) mechanism is highly sensitive to steric hindrance. Reactivity follows: Methyl > primary (\(1^{\circ}\)) > secondary (\(2^{\circ}\)) > tertiary (\(3^{\circ}\)) > Aryl/Vinyl halides (non-reactive).
Step 1: Classify the substrates.
- (I) Bromobenzene: Aryl halide (extremely unreactive toward \(S_N2\) due to resonance and steric factors). - (II) 2-Bromopropane: Secondary (\(2^{\circ}\)) alkyl halide. - (III) 1-Bromopropane: Primary (\(1^{\circ}\)) alkyl halide.
Step 2: Order the reactivity.
\(1^{\circ} > 2^{\circ} > \text{Aryl halide}\). Therefore, \(III > II > I\). \[ \boxed{III > II > I} \]
Step 1: Classify the substrates.
- (I) Bromobenzene: Aryl halide (extremely unreactive toward \(S_N2\) due to resonance and steric factors). - (II) 2-Bromopropane: Secondary (\(2^{\circ}\)) alkyl halide. - (III) 1-Bromopropane: Primary (\(1^{\circ}\)) alkyl halide.
Step 2: Order the reactivity.
\(1^{\circ} > 2^{\circ} > \text{Aryl halide}\). Therefore, \(III > II > I\). \[ \boxed{III > II > I} \]
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