Draw the structure of the following compounds and identify the functional group present in them.
(i) Butanoic acid (ii) Bromopropane (iii) Butyne

Explanation

i] Butanoic acid `H-underset(H)underset(|)overset(H)overset(|)(C )-underset(H)underset(|)overset(H)overset(|)(C )-underset(H)underset(|)overset(H)overset(|)(C )-overset(O)overset(||)(C )-OH`
Carboxlic acid group - COOH
ii] Bromopropane `H-underset(H)underset(|)overset(H)overset(|)(C )-underset(H)underset(|)overset(H)overset(|)(C )-underset(H)underset(|)overset(H)overset(|)(C )-Br`
iii] Butyne `H-underset(H)underset(|)overset(H)overset(|)(C )-underset(H)underset(|)overset(H)overset(|)(C )-C-=C-H`
Triple bond `C -= C`.