1. CH₃-C(CH₃)(CH₃)-OH (i.e. (CH₃)₃C-OH , drawn with CH₃ above and below the carbon) 2. CH₃-CH₂-CH₂-CH₂OH 3. CH₃-CH₂-CH(OH)-CH₃ (drawn with CH₃ below the CH) 4. CH₃-CH(CH₃)-CH₂OH (drawn with CH₃ below the CH)

Topic: Alcohols: identification of 1/2/3 alcohols, dehydration mechanism· Organic Compounds Containing Oxygen

Which one of the following alcohols reacts instantaneously with Lucas reagent?

1. \(CH_3-C(CH_3)(CH_3)-OH\) (i.e. \((CH_3)_3C-OH\), drawn with \(CH_3\) above and below the carbon)

2. \(CH_3-CH_2-CH_2-CH_2OH\)

3. \(CH_3-CH_2-CH(OH)-CH_3\) (drawn with \(CH_3\) below the CH)

4. \(CH_3-CH(CH_3)-CH_2OH\) (drawn with \(CH_3\) below the CH)

Doubtly Asked 30 Oct 2026 NEET UG 2024 Practice test neet Save WhatsApp Report

1 answer

Best answer

Answer: 1. \(CH_3-C(CH_3)(CH_3)-OH\) (i.e. \((CH_3)_3C-OH\), drawn with \(CH_3\) above and below the carbon)

Key idea: Lucas reagent (\(\mathrm{ZnCl_2}\)/conc. HCl) works through carbocation formation, so tertiary alcohols react fastest.

Tertiary alcohol \(\mathrm{(CH_3)_3COH}\) gives turbidity immediately. Secondary (butan-2-ol) takes about 5 minutes. Primary alcohols (options 2 and 4) do not react at room temperature. Option 1.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

Was this answer helpful?

Which one of the following alcohols reacts instantaneously with Lucas reagent?

1 answer

Your answer