Question

$2HCHO\stackrel{50\%NaOH}{\to }C{H}_{3}OH+HCOONa$ This reaction is called:

• A. aldol condensation
• B. Tischenko reaction
• C. Cannizaro reaction
• D. Reimer Tiemann reaction

Answer 1

Answer: (C)

Define all reactions to find correct answer.
(i) Aldol condensation: carbonyl compound which have
$\alpha -H$ atom $+NaOH\to \beta$ - hydroxy carbonyl compound
(ii) Reimer Tiemann reaction:
Phenol $+CC{l}_4+NaOH\to$ Salicylic acid
(iii) cannizaro reaction:
$\underset{\text{which do not have α−H atom}}{\mathrm{Aldehyde}}+NaOH\to$ alcohol + acid .,
$\underset{\text{ formalehyde }}{2HCHO}\stackrel{50}{\to }\underset{\text{ methanal }}{C{H}_{3}OH}+\underset{\text{ sodium formate }}{\mathrm{HCOONa}}$