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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_6H_5CHO +CH_(3) CHOoverset("dil")underset(NaOH)rarr`
`C_6H_5-CH(OH) CH_2CHOoverset("Heat")underset(-H_2O)rarr C_6H_5-CH=CHCHO`
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