Haloalkanes and Haloarenes

Haloalkanes and Haloarenes

Question

An unknown alcohol is treated with the “Lucas reagent” to determine whether the alcohol is primary, secondary or tertiary. Which alcohol reacts fastest and by what mechanism

  • Secondary alcohol by SN1

  • Tertiary alcohol by SN1

  • Secondary alcohol by SN2

  • Tertiary alcohol by SN2

Answer

B.

Tertiary alcohol by SN1

Reaction proceeds through carbocation formation as 30 carbocation is highly stable, hence reaction proceeds through SN1 with 30 alcohol. 

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