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How many crossed aldol products would be...

How many crossed aldol products would be obtained when a mixture of formaldehyde, acetaldehyde and benzaldehyde is mixed with dilute alkali?

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The correct Answer is:
2
`underset("Acetaldehyde")(CH_3-overset(O)overset(||)C-H)+ underset("Formaldehyde")(H-overset(O)overset(||)C-H) overset("Dil. NaOH")to underset(beta"-Hydroxypropionaldehyde")(HO-overset(beta)CH_2-overset(alpha)CH_2-overset(O)overset(||)C-H)`
`underset("Benzaldehyde")(C_6H_5-overset(O)overset(||)C-H)+ underset("Acetaldehyde")(CH_3-overset(O)overset(||)C-H) underset(273 K)overset("Dil. NaOH")to underset("Aldol")([C_6H_5-overset(OH)overset(|)CH-CH_2-overset(O)overset(||)C-H]) underset(-H_2O)to underset("or Cinnamaldehyde")("3-Phenylprop-2-en-1-al")(C_6H_5-overset(3)CH=overset(2)CH-overset(O)overset(1 ||)C-H)`
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