Answer
a) CH$_{3}$CH$_{2}$CH$_{2}$CH$_{2}$CH$_{2}$COOH
b) CH$_{3}$CH$_{2}$CH$_{2}$CHO
c) CH$_{3}$COCH$_{2}$CH$_{2}$CH$_{3}$
Work Step by Step
a) CH$_{3}$CH$_{2}$CH$_{2}$CH$_{2}$CH$_{2}$COOH
b) CH$_{3}$CH$_{2}$CH$_{2}$CHO
c) CH$_{3}$COCH$_{2}$CH$_{2}$CH$_{3}$