Question

The only CORRECT combination that gives two different carboxylic acids is

• A. (II) (iv) (R)
• B. (III) (iii) (P)
• C. (I) (i) (S)
• D. (IV) (iii) (Q)

Answer 1

Answer: (B)

(III) (iii) (P)

The only CORRECT combination that gives two different carboxylic acids is
(III) benzaldehyde (iii) ${\left(C{H}_{3}CO\right)}_{2}O/C{H}_{3}COOK$ (P) condensation.
It is an example of perkin condensation. Two isomers cis and trans corresponds to two carboxylic acids (Z) and (E) 3-phenylacrylic acid.