Show how are the following alcohols prepared by the reaction of a suitable Grignard reagent on methanal?

Explanation

(i) the part which has been anclosed in box comes from methanal while the remaining part comes from the grignard reagent. Therefore,t he grignard reagent should be isopropylmagnesium bromide. Thus,

(ii) The part which has been enclosed in box comes from methanal while the remaining part comes from the Grignard reagent. Therefore, the Grignard reagennt must be cyclohexylmagnesium bromide. thus,