The aldehyde shown is warmed with iodine and aqueous NaOH. Which pair of products is formed?

A $CHI X_{3}$ and sodium acetate
B $CHI X_{3}$ and sodium formate
C $CH X_{3} I$ and sodium formate
DNo haloform reaction, because aldehydes are oxidised only by Tollens' reagent

Answer: B

The drawn compound is ethanal, the only aldehyde that gives the haloform reaction (it has a CH3-C=O unit). Tri-iodination of CH3 gives CI3CHO, which is cleaved by hydroxide to CHI3 and HCOONa (the carbonyl carbon ends as formate).

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