d
Formation of only \(CH_3COOH\) by ozonolysis indicates that the compound \(Y\) should be \(CH_3CH=CHCH_3\) which can be formed by all of the three given compounds

\(C{{H}_{2}}=\underset{X}{\mathop{CH-CH}}\,=C{{H}_{2}}\xrightarrow{1{{H}_{2}}/Pt}\)  \(C{{H}_{3}}-\underset{Y}{\mathop{CH}}\,=CH-C{{H}_{3}}\)

\(\underset{X}{\mathop{C{{H}_{3}}C\equiv CC{{H}_{3}}}}\,\xrightarrow{1{{H}_{2}}/Pt}\underset{Y}{\mathop{C{{H}_{3}}CH=CHC{{H}_{3}}}}\,\)

\(\underset{X}{\mathop{C{{H}_{2}}=C=CHC{{H}_{3}}}}\,\xrightarrow{1{{H}_{2}}/Pt}\)

\(\underset{Y}{\mathop{C{{H}_{3}}CH=CHC{{H}_{3}}}}\,\xrightarrow{{{O}_{3}}}2C{{H}_{3}}COOH\)