Answer:
Because of the presence of a-H atoms,
propanal and butanal both undergo self and cross aldol condensation.
Sol. -hydrogen
atoms are present in propanal as well as butanal. So, they can undergo aldol
condensation four ways:
(i) Condensation involving
propanal only
(ii) Condensation involving
butanal only
(iii) Condensation involving
butanal (electrophile) and propanal (nucleophile)
(iv) Condensation involving
propanal (electrophile) and butanal (nucleophile)
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