Allyl phenyl ether can be prepared by heating :
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- \(\mathrm{CH_2=CH-Br + C_6H_5-CH_2-ONa}\)
- \(\mathrm{C_6H_5-CH=CH-Br + CH_3-ONa}\)
- \(\mathrm{CH_2=CH-CH_2-Br + C_6H_5ONa}\)
- \(\mathrm{C_6H_5Br + CH_2=CH-CH_2-ONa}\)
The Correct Option is C
Solution and Explanation
Williamson synthesis: \(\mathrm{R-X + R'ONa \to R-O-R'}\), by an \(\mathrm{S_N2}\) attack of the alkoxide/phenoxide on an alkyl halide.
Vinyl bromide (option 1), \(\mathrm{C_6H_5CH=CHBr}\) (option 2) and bromobenzene (option 4) are vinylic/aryl halides and do not undergo \(\mathrm{S_N2}\) substitution.
Allyl bromide with sodium phenoxide gives \(\mathrm{C_6H_5OCH_2CH=CH_2 + NaBr}\) (option 3).
Answer: (3) \(\mathrm{CH_2=CH-CH_2-Br + C_6H_5ONa}\)
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