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B
β - cyclohexyl α,β - unsaturated aldehyde
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C
β - aryl - α,β - unsaturated acid
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D
all of the above
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Solution
The correct option is Cβ - aryl - α,β - unsaturated acid In Perkin reaction, an aromatic aldehyde condenses with acid anhydride in the presence of sodium salt of acid (from which acid anhydride is derived) to form β-aryl-α,β-unsaturated acid.