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B
β-cycloalkyl - α,β - unsaturated aldehyde
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C
β -aryl - α,β- unsaturated acid
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D
α,β - unsaturated ketone
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Solution
The correct option is Cβ -aryl - α,β- unsaturated acid Aromatic aldehyde on reacting with carboxylic acid anhydride in presence of salt of carboxylic acid to form α,β-unsaturated acids. This reaction is called Perkin reaction.
Hence, the correct answer should be option (c) β−aryl−α,β− unsaturated acid.