NEETChemistryAlcohols Phenols and Ethers
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): 2-Methylpropan-1-ol reacts instantaneously with Lucas reagent to produce turbidity at room temperature. Reason (R): Tertiary alcohols react fastest with Lucas reagent because the reaction proceeds via the formation of a highly stable tertiary carbocation intermediate. In the light of the above stat
Options
- ABoth (A) and (R) are true and (R) is the correct explanation of (A)
- BBoth (A) and (R) are true but (R) is not the correct explanation of (A)
- C(A) is true but (R) is false
- D(A) is false but (R) is true
Correct answer
D. (A) is false but (R) is true
Step-by-step solution
Assertion (A) is false. 2-Methylpropan-1-ol (isobutyl alcohol) is a primary (1 ^ ) alcohol. Primary alcohols do not produce turbidity with Lucas reagent at room temperature because the primary carbocation intermediate is highly unstable. Reason (R) is true. The Lucas test proceeds via an S_N 1 mechanism. Tertiary alcohols react instantaneously to give turbidity because they form highly stable tertiary carbocations, making the reaction very fast. Therefore, (A) is false but (R) is true. Answer: (A) is false but (R)