322960
In the Williamson synthesis of ethers given by the general equation \(\mathrm{R}-\mathrm{X}+\mathrm{R}^{1} \mathrm{ONa} \longrightarrow \mathrm{R}-\mathrm{O}-\mathrm{R}^{1}\). The yield from \(\mathrm{R}-\mathrm{X}\) follows the sequence
1 \(\mathrm{CH}_{3}>1^{0}>2^{0}>3^{0}\)
2 \(\mathrm{CH}_{3} < 1^{0} < 2^{0} < 3^{0}\)
3 \(\mathrm{CH}_{3} < 1^{0}>2^{0}>3^{0}\)
4 \(\mathrm{CH}_{3}>1^{0} < 2^{0} < 3^{0}\)
Explanation:
\(3^{\circ} \mathrm{RX}\) produces alkene with \(\mathrm{R}^{1} \mathrm{ONa}\) instead of ethers, hence, least reactive. Reactivity order :\({\text{ - C}}{{\text{H}}_{\text{3}}}{\text{ > }}1^\circ > 2^\circ > 3^\circ \)