Ethanal is heated with a catalytic amount of aluminium ethoxide in dry benzene (Tishchenko reaction). The product is

Aethyl ethanoate
B3-hydroxybutanal
Cbut-2-enal
Ddiethyl ether

Answer: A

Aluminium alkoxide catalyses hydride transfer between two aldehyde molecules, as in Cannizzaro, but the alkoxide produced combines with the acyl group. The overall result is

2 CH X_{3} CHO \to CH X_{3} COOC X_{2} H X_{5}

, an ester, not an aldol.

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