The total number of $\mathrm{S}_{\mathrm{N}} 2$ (nucleophilic substitution bimolecular) reactions involved…

The total number of $\mathrm{S}_{\mathrm{N}} 2$ (nucleophilic substitution bimolecular) reactions involved in the following reaction sequence is

1. 3
2. 4
3. 2
4. 5

Solution

Total number of $\mathrm{S}_{\mathrm{N}} 2$ reactions involved in the reaction is three. In first $\mathrm{S}_{\mathrm{N}} 2$ reaction methoxy group is replaced by $\mathrm{OH}$ group (i.e. $\mathrm{CH}_3$ group replace by $\mathrm{H}^{+}$of $\mathrm{HI}$ ). In second $\mathrm{S}_{\mathrm{N}} 2$ reaction another methoxy group get replaced by $\mathrm{OH}$. In third $\mathrm{S}_{\mathrm{N}} 2$ reaction $\mathrm{OH}$ get replaced by iodide group.

Asked in: JEE-TOPICTESTS-CHEMISTRY

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