Alcohols Phenols and Ethers - Result Question 21
####21. The compound which reacts fastest with Lucas reagent at room temperature is
[1989]
(a) Butan-1-ol
(b) Butan-2-ol
(c) 2-Methyl propan-1-ol
(d) 2-Methylpropan-2-ol
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Solution:
- (d) The rates of reaction of different alcohols with lucas reagent follows the order.
$3^{\circ}$ alcohol $>2^{\circ}$ alcohol $>1^{\circ}$ alcohol
Since carbocations are formed as intermediate, more stable the carbocation, higher will be the reactivity of the parent compound (alcohol). 2-Methylpropan-2-ol generates a $3^{\circ}$ carbocation, so it will react fastest; other three generates either $1^{\circ}$ or $2^{\circ}$ carbocations.
2-Methylpropan-2-ol
