Question:
Which from following is a suitable method for preparation of ether?
Which from following is a suitable method for preparation of ether?
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Williamson synthesis needs a primary alkyl halide and an alkoxide.
Updated On: Oct 1, 2026
- Reacting sodium methoxide and tertiary butyl bromide
- Reacting sodium tertiarybutoxide and methyl bromide
- Reacting methyl alcohol and ethene
- Reacting methyl alcohol and methyl bromide
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The Correct Option is B
Solution and Explanation
Step 1: Recall the method
In the Williamson synthesis an alkoxide attacks an alkyl halide by an SN2 reaction. A tertiary halide would eliminate to alkene.
Step 2: Check the options
(A) Tertiary butyl bromide with methoxide gives isobutene by elimination, so it is unsuitable.
(B) Sodium tert-butoxide with methyl bromide gives methyl tert-butyl ether, which is suitable.
(C) Methyl alcohol and ethene do not form an ether this way.
(D) Methyl alcohol and methyl bromide do not react without a base.
Final Answer:
Sodium tert-butoxide and methyl bromide work, option (B). \[ \boxed{\text{(B)}} \]
In the Williamson synthesis an alkoxide attacks an alkyl halide by an SN2 reaction. A tertiary halide would eliminate to alkene.
Step 2: Check the options
(A) Tertiary butyl bromide with methoxide gives isobutene by elimination, so it is unsuitable.
(B) Sodium tert-butoxide with methyl bromide gives methyl tert-butyl ether, which is suitable.
(C) Methyl alcohol and ethene do not form an ether this way.
(D) Methyl alcohol and methyl bromide do not react without a base.
Final Answer:
Sodium tert-butoxide and methyl bromide work, option (B). \[ \boxed{\text{(B)}} \]
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