alleryWhich of the following named reactions does **NOT** require an $\alpha$-hydrogen on the substrate?
AHVZ reaction
BCross-aldol condensation
CAldol condensation
DCannizzaro reaction
Answer & Solution
Correct answer: D. Cannizzaro reaction
Cannizzaro is the *exception*: it operates only on aldehydes without $\alpha$-H. Aldol, HVZ, and cross-aldol all require enolisable $\alpha$-H. This is a popular JEE trap.
Keep practising Aldehydes, Ketones and Carboxylic Acids
Browse all Aldehydes, Ketones and Carboxylic Acids questions for ISC Class 12, or explore more Chemistry topics.
Related questions
The IUPAC name of the simplest aldehyde, $\mathrm{HCHO}$, isMatch each named organic reaction to its description.The product of the Hunsdiecker reaction on $CH_3CH_2COOAg$ with $Br_2/CCl_4$ isMatch each named organic reaction to its description.Among $1$-butanol, $2$-butanol and $tert$-butanol, the order of reactivity in the Lucas te**Gatterman–Koch reaction** formylates benzene usingIn **Dow's process**, chlorobenzene is converted to phenol by treatment withIdentify the correct conversion: $CH_3CN \xrightarrow{?} CH_3CHO$ (one step).