Class 12 Exam > Class 12 Questions > HBr reacts fastest with [1992]a)2-Mehtylpropa...
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HBr reacts fastest with [1992]
- a)2-Mehtylpropan-1-ol
- b)2-Methylpropene-2-ol
- c)propan-2-ol
- d)propan-1-ol.
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
HBr reacts fastest with [1992]a)2-Mehtylpropan-1-olb)2-Methylpropene-2...
Greater th e stability of the in ter mediate carbocation, more reactive is the alcohol.
Since 2-methylpropan-2-ol generates 3° carbocation, therefore, it reacts fastest with HBr.
Since 2-methylpropan-2-ol generates 3° carbocation, therefore, it reacts fastest with HBr.
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Most Upvoted Answer
HBr reacts fastest with [1992]a)2-Mehtylpropan-1-olb)2-Methylpropene-2...
Explanation:
Reactivity of HBr with alcohols:
- HBr reacts with alcohols through an SN1 mechanism, where the alcohol molecule undergoes protonation to form a carbocation intermediate.
- The rate of reaction depends on the stability of the carbocation intermediate formed.
Comparison of the given alcohols:
2-Methylpropene-2-ol:
- This alcohol undergoes dehydration to form a more stable tertiary carbocation, making it the most reactive towards HBr.
2-Methylpropan-1-ol:
- This alcohol forms a secondary carbocation upon protonation, making it less reactive compared to 2-Methylpropene-2-ol.
Propan-2-ol:
- Propan-2-ol forms a secondary carbocation similar to 2-Methylpropan-1-ol, hence it is less reactive towards HBr.
Propan-1-ol:
- Propan-1-ol forms a primary carbocation upon protonation, making it the least reactive among the given alcohols.
Conclusion:
- Among the given options, 2-Methylpropene-2-ol reacts fastest with HBr due to the formation of a stable tertiary carbocation intermediate during the reaction.
Reactivity of HBr with alcohols:
- HBr reacts with alcohols through an SN1 mechanism, where the alcohol molecule undergoes protonation to form a carbocation intermediate.
- The rate of reaction depends on the stability of the carbocation intermediate formed.
Comparison of the given alcohols:
2-Methylpropene-2-ol:
- This alcohol undergoes dehydration to form a more stable tertiary carbocation, making it the most reactive towards HBr.
2-Methylpropan-1-ol:
- This alcohol forms a secondary carbocation upon protonation, making it less reactive compared to 2-Methylpropene-2-ol.
Propan-2-ol:
- Propan-2-ol forms a secondary carbocation similar to 2-Methylpropan-1-ol, hence it is less reactive towards HBr.
Propan-1-ol:
- Propan-1-ol forms a primary carbocation upon protonation, making it the least reactive among the given alcohols.
Conclusion:
- Among the given options, 2-Methylpropene-2-ol reacts fastest with HBr due to the formation of a stable tertiary carbocation intermediate during the reaction.
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HBr reacts fastest with [1992]a)2-Mehtylpropan-1-olb)2-Methylpropene-2-olc)propan-2-old)propan-1-ol.Correct answer is option 'B'. Can you explain this answer?
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