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Question:

The only CORRECT combination that gives two different carboxylic acids is (III) (iii) (P), (II) (iv) (R), (I) (i) (S), (IV) (iii) (Q)?

(III) (iii) (P)

(II) (iv) (R)

(I) (i) (S)

(IV) (iii) (Q)

Solution:

The only CORRECT combination that gives two different carboxylic acids is (III) benzaldehyde (iii) (CH3CO)2O/CH3COOK (P) condensation. It is an example of Perkin condensation. Two isomers cis and trans correspond to two carboxylic acids (Z) and (E) 3-phenylacrylic acid.