Chemistry - Carbonyl compounds Question with Solution | TestHub

1. Isobutyraldehyde undergoes a crossed-aldol condensation with excess formaldehyde (HCHO) followed by a Cannizzaro reaction in aqueous NaOH.

2. This process converts the aldehyde group into an alcohol, forming 2,2-dimethylpropane-1,3-diol as compound P.

3. Under acidic conditions ($pH:4to5$), this 1,3-diol (P) reacts with acetone to form a cyclic ketal.

4. The condensation yields a stable 6-membered ring named 2,2,5,5-tetramethyl-1,3-dioxane.

5. Thus, the structure corresponding to Q is given in option (B).