MDCAT Chemistry MCQ #634

In the Lucas test used to differentiate alcohols for alkyl halide preparation, which class of alcohol reacts most rapidly?

MDCAT Chemistry MCQ #634

  1. Question 1

    Q1. In the Lucas test used to differentiate alcohols for alkyl halide preparation, which class of alcohol reacts most rapidly?

    • A) Primary alcohols react immediately at room temperature.
    • B) Secondary alcohols react faster than tertiary alcohols.
    • C) Tertiary alcohols produce immediate cloudiness or oiliness.
    • D) Primary alcohols produce cloudiness within five minutes.

    Answer: Tertiary alcohols produce immediate cloudiness or oiliness.

    Explanation: Tertiary alcohols react immediately with Lucas reagent (ZnCl2/HCl), while secondary alcohols take 5-10 minutes and primary alcohols require heating.