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Q.
Lucas reagent reacts fastest with
Rajasthan PMTRajasthan PMT 2007Alcohols Phenols and Ethers
Solution:
The order of reactivity with alcohols with lucas reagent is
$3^{\circ}>2^{\circ}>1^{\circ}$
$\therefore $ Lucas reagent reacts fastest with $3^{\circ}$ alcohol.
(a) $\underset{\text{butanol - 1 $(1^{\circ}$ alcohol)}}{CH_3 - CH_2 - CH_2 - CH_2OH}$
(b) $\underset{\text{butanol-1 $(2^{\circ}$ alcohol)}}{CH_3 - CH_2 - \overset{\underset{|}{O}H}{C}H - CH_3}$
(c) $\underset{\text{2 - methyl 2 - propanol $(3^{\circ}$ alcohol)}}{CH_3 - \underset{\overset{|}{O}H}{\overset{\underset{|}{C}H_3}{C}} - CH_3}$
(d) $\underset{\text{2 - methyl 1- propanol $(1^{\circ}$ alcohol)}}{CH_3 - \overset{\underset{|}{C}H_3}{C}H - CH_2OH}$
$\therefore $ choice (c) is the answer as it is $3^{\circ}$ alcohol and rate of reaction is fastest for $3^{\circ}$ alcohol.