Question
Write structural formulas and names of four possible aldol condensation products from propanal and butanal in each case indicate which aldehyde acts as nucleophile and which as electrophile.

Answer

Four products obtained by the aldol condensation of propanal and butanal are as follows :
(i) Product formed from propanal 
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(ii) Product formed from butanal
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(iii) Product formed when propanal as nucleophile and butanal as electrophile
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(iv) Product formed when butanal as nucleophile and propanal as electrophile
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