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

Explanation

(i) `H-underset("Carboxyl group -COOH")(underset(H)underset(|)overset(H)overset(|)C-underset(H)underset(|)overset(H)overset(|)C-underset(H)underset(|)overset(H)overset(|)C--underset(O)underset(||)-OH)`
(ii) `H-underset("Halogen atom -Br")(underset(H)underset(|)overset(H)overset(|)C-underset(H)underset(|)overset(H)overset(|)C-underset(H)underset(|)overset(H)overset(|)C-Br)`
(iii) `H-underset("Triple bond "C equiv C ("alkynes"))(underset(H)underset(|)overset(H)overset(|)C-underset(H)underset(|)overset(H)overset(|)C-C-=C-H)`