Question:
The product obtained when 2-methylpropan-2-ol is treated with alumina at 423 K is
The product obtained when 2-methylpropan-2-ol is treated with alumina at 423 K is
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Dehydration of tertiary alcohols like 2-methylpropan-2-ol typically leads to the formation of alkenes, such as isobutylene.
Updated On: Jan 30, 2026
- Propanone
- Propene
- Propanoic acid
- Isobutylene
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The Correct Option is D
Solution and Explanation
Step 1: Understanding the reaction.
When 2-methylpropan-2-ol (tert-butyl alcohol) is treated with alumina (Al\(_2\)O\(_3\)) at 423 K, it undergoes dehydration to form an alkene. The product is isobutylene (2-methylpropene).
Step 2: Analyzing the options.
(A) Propanone: This is a ketone and not formed in this dehydration reaction.
(B) Propene: This is an alkene, but the product from 2-methylpropan-2-ol will be isobutylene, not propene.
(C) Propanoic acid: This is a carboxylic acid and is not the product of this reaction.
(D) Isobutylene: Correct — 2-methylpropan-2-ol undergoes dehydration to form isobutylene.
Step 3: Conclusion.
The correct answer is (D) Isobutylene, as it is the product of the dehydration of 2-methylpropan-2-ol.
When 2-methylpropan-2-ol (tert-butyl alcohol) is treated with alumina (Al\(_2\)O\(_3\)) at 423 K, it undergoes dehydration to form an alkene. The product is isobutylene (2-methylpropene).
Step 2: Analyzing the options.
(A) Propanone: This is a ketone and not formed in this dehydration reaction.
(B) Propene: This is an alkene, but the product from 2-methylpropan-2-ol will be isobutylene, not propene.
(C) Propanoic acid: This is a carboxylic acid and is not the product of this reaction.
(D) Isobutylene: Correct — 2-methylpropan-2-ol undergoes dehydration to form isobutylene.
Step 3: Conclusion.
The correct answer is (D) Isobutylene, as it is the product of the dehydration of 2-methylpropan-2-ol.
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