Write the IUPAC names of the following compounds.
(i) `CH_(3)-CH_(2)-underset(CH_(3))underset(|)(CH)-CH_(2)-CH_(3)` (ii) `CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)C-CH_(2)-CH_(3)-underset(underset(CH_(3))underset(|)(CH_(2)))underset(|)(CH)-CH_(3)`
(iii) `CH_(3)-underset(CH_(3))underset(|)(CH)-CH_(2)-CH_(3)`

Explanation

(i) 3-methylpentane (ii) 2, 2,5-trimethylheptane (iii) 2-methylbutanal