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Benzaldehyde is treated with acetaldehyd...

Benzaldehyde is treated with acetaldehyde in presence of dilute alkali. What happens ?

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When benzaldehyde reacts with acetaldehyde, first unstable `beta`-hydroxy aldehyde is formed which loses a molecule of water to form cinnamaldehyde.
`C_(6)H_(5)CHO + CH_(3)CHO underset(NaOH)overset(dil)rarr`
`C_(6)H_(5)-CH(OH)CH_(2)CHOunderset("Heat")overset(dil)rarr C_(6)H_(5)-CH=CHCHO`
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