Write the common names for each of the following structures:
(i) `CH_(3)underset(Cl)underset(|)(CH)underset(CH_(3))underset(|)(CH)CO_(2)H`
(ii) `CH_(3)CH_(2)underset(CH_(3))underset(|)overset(beta)(CH)-underset(CH_(3))underset(|)overset(alpha)(CH)CO_(2)H`
(iii) `underset(Cl)underset(|)(CH_(2))CH_(2)underset(CH_(3))underset(|)(CH)CO_(2)H`
Strategy: Use Greek letters `(alpha, beta, gamma`,etc.) to designate the position of the substituents and side-chains attached to the parent chain.

Explanation

(i) `beta`-Chloro-`alpha`-methylbutynic acid
(ii) `alpha, beta`-Dimethylvaleric acid
(iii) `gamma`-Chloro-`alpha`-methylbutyric acid