Ethane-1,2-diol (Ethylene glycol) undergoes various specific dehydration reactions depending strictly on the reagents. When heated with anhydrous , what is the major organic product formed via rearran

Question

Ethane-1,2-diol (Ethylene glycol) undergoes various specific dehydration reactions depending strictly on the reagents. When heated with anhydrous $ZnCl_2$, what is the major organic product formed via rearrangement?

Prashant Kotian · Accepted Answer

Correct answer: B. Ethylene glycol forms 1,4-dioxane with conc. . However, heating with anhydrous triggers a pinacol-like rearrangement involving a hydride shift, yielding ethanal (acetaldehyde).

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