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Homework answers / question archive / What reagent (or compound) causes the observed visual change in a positive Lucas test? A

What reagent (or compound) causes the observed visual change in a positive Lucas test? A

Chemistry

What reagent (or compound) causes the observed visual change in a positive Lucas test? A. Cr(VI) is reduced to Cr(ll) B. The alkyl halide product is insoluble in water C. The product hydrazone is insoluble. D. Ag() is reduced to Ag(0)

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The positive Lucas test can be conformed by observing the change of the solution from clear to turbid. The reaction is a substitution, in which chloride replaces a hydroxyl group of alcohol. The alkyl halide formed in the reaction is insoluble in the solution and thus solution appears turbid.

Therefore, the answer is

B. The alkyl halide product is insoluble in water

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