Question
Write the IUPAC names for the following : $\begin{array}{cc}
\phantom{.........}\ce{H}\phantom{........}\ce{H}\phantom{........}\\
\phantom{.....}|\phantom{.........} \phantom{.}|\phantom{....}\\
\ce{H-C-C≡C-C-H}\\
\phantom{.....}|\phantom{.........} \phantom{.}|\phantom{....}\\
\phantom{.........}\ce{H}\phantom{........}\ce{H}\phantom{........}\\
\end{array}$
\phantom{.........}\ce{H}\phantom{........}\ce{H}\phantom{........}\\
\phantom{.....}|\phantom{.........} \phantom{.}|\phantom{....}\\
\ce{H-C-C≡C-C-H}\\
\phantom{.....}|\phantom{.........} \phantom{.}|\phantom{....}\\
\phantom{.........}\ce{H}\phantom{........}\ce{H}\phantom{........}\\
\end{array}$