Write the structural formulas for the following compounds whose IUPAC names are given:
(i) 3-Ethyl-2-methylpentane (ii) 3, 4, 8-Trimethyldecane
(iii) 3, 4, 4, 5--Tetramethylheptane, (iv) 2,5- Dimethylhexane

Explanation

(i) 3-Ethyl-2-methylpentane
`overset(1)CH_(3)-underset(CH_(3))underset(|)overset(2)CH-underset(C_(2)H_(5))underset(|)overset(3)CH-overset(4)CH_(2)-overset(5)CH_(3)`
(ii) 3, 4, 8-Trimethyldecane
`H_(3)overset(10)C-overset(9)CH_(2)-underset(CH_(3))underset(|)overset(8)CH-overset(7)CH_(2)-overset(6)CH_(2)-overset(5)CH_(2)-underset(CH_(3))underset(|)overset(4)CH-underset(CH_(3))underset(|)overset(3)CH-overset(2)CH_(2)-overset(1)CH_(3)`
(iii) 3, 4, 4, 5--Tetramethylheptane
`overset(1)CH_(3)-overset(2)CH_(2)-underset(CH_(3))underset(|)overset(3)CH-underset(CH_(3))underset(|)overset(CH_(3))overset(|)overset(4)C-underset(CH_(3))underset(|)overset(5)CH-overset(6)CH_(2)-overset(7)CH_(3)`
(iv) 2,5- Dimethylhexane
`overset(1)CH_(3)-underset(CH_(3))underset(|)overset(2)CH-overset(3)CH_(2)-overset(4)CH_(2)-underset(CH_(3))underset(|)overset(5)CH-overset(6)CH_(3)`