Which of the following represents the correct IUPAC name of the compounds concerned ?
(a) 2, 2-Dimethylpentane or 2-Dimethylpentane
(b) 2, 3-Dimethylpentane or 3, 4-Dimethylpentane
(c) 2, 4, 7-Trimethyloctane or 2, 5, 7-Trimethyloctane.
(d) But-3-yn-1-ol ot But-4-ol-1-yne

Explanation

(a) `{:(" "CH_(3)),(" |"),(overset(1)(C)H_(3)overset(2)(-C)-overset(3)(C)H_(2)-overset(4)(C)H_(2)-overset(5)(C)H_(3)),(" |"),(" "CH_(3)),(" 2, 2-Dimethylpentane"):}` (b) `{:(overset(1)(C)H_(3)-overset(2)(C)H-overset(3)(C)H-overset(4)(C)H_(2)-overset(5)(C)H_(3)),(" |"" |"),(" "CH_(3)" "CH_(3)),(" 2, 3-Dimethylpentane"):}`
(c) `{:(overset(1)(C)H_(3)-overset(2)(C)H-overset(3)(C)H_(2)-overset(4)(C)H-overset(5)(C)H_(2)-overset(6)(C)H_(2)-overset(7)(C)H-overset(8)(C)H_(3)),(" |"" |"" |"),(" "CH_(3)" "CH_(3)" "CH_(3)),(" 2, 3-Dimethylpentane"):}` (b) `{:(overset(4)(C)H equiv overset(3)(C)-overset(2)(C)H_(2)-overset(1)(C)H_(2)-OH),(" But-3-yn-1-ol"):}`