Arrange these compounds in order of increasing SN2 reaction rate:

Engineering

Chemistry

Nucleophilic Substitution

Question

Arrange these compounds in order of increasing S_N2 reaction rate:

III <IV < I < II

III < II < I < IV

III < I < II < IV

IV < III < I < II

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SN2 reaction rate depends on steric hindrance and leaving group ability. Less hindered alkyl halides react faster. Order by increasing steric bulk:

III (tertiary, most hindered) < I (secondary) < II (primary, but β-branched) < IV (primary, least hindered).

Leaving group (Br⁻) is same. So correct order is III < I < II < IV.

Final answer: III < I < II < IV