choose the correct pair which may show cross aldol condensation reactions
A. Benzene & Benzaldehyde
B. Acetaldehyde & Benzene
C. Benzaldehyde & Formaldehyde
D. Benzaldehyde & acetaldehyde
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option (d) Benzaldehyde & acetaldehyde
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(D) Benzaldehyde & acetaldehyde.
Aldol condensation: It is a reaction in organic chemistry where a carbonyl compound reacts with enolate ion in the presence of a dilute base.
Cross-aldol condensation:
- It is the reaction between two different types of carbonyl compounds.
- For cross-aldol condensation to occur at least one reactant out of the two should contain alpha hydrogen.
- Cross-aldol will not take place between Benzene & Benzaldehyde because Benzene is an alkene and not a carbonyl compound.
- Cross-aldol will not take place between Acetaldehyde & Benzene because Benzene is an alkene and not a carbonyl compound.
- Cross-aldol will not take place between Benzaldehyde & Formaldehyde because neither of these has alpha hydrogen.
- Cross-aldol will take place between Benzaldehyde & acetaldehyde as they are carbonyl compounds and acetaldehyde have alpha hydrogen.
Hence, the reaction between benzaldehyde and acetaldehyde in the presence of dilute NaOH will give cross-aldol reaction.
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