From which of the following halogen can be replaced by H2O by SN1?

Engineering

Chemistry

Nucleophilic Substitution

Question

From which of the following halogen can be replaced by H₂O by S_N1?

CH₃ — Br

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SN1 reactions favor tertiary carbocations due to stability. The rate depends on carbocation formation ease. Tertiary halides form stable carbocations fastest.

Among the options, only the third structure (tertiary bromide) forms a stable tertiary carbocation after bromide leaves:

$C_{6}^{+} H_{5} - C_{+} (C H_{3}) C_{2} H_{5}$

Final answer: Third option (tertiary bromide)