Which combination of a Grignard reagent and a carbonyl compound will definitively yield a tertiary a — Alcohols Phenols and Ethers Chemistry Question

💡 Solution & Explanation

Grignard reagents ($R-MgX$) react with formaldehyde (methanal) to yield primary alcohols, with other aldehydes to yield secondary alcohols, and with ketones to yield tertiary alcohols. Acetone is a ketone, so its reaction with methylmagnesium bromide yields a tertiary alcohol (tert-butyl alcohol).