$\begin{array}{*{20}{c}}
{\begin{array}{*{20}{c}}
{O\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,O} \\
{||\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,||}
\end{array}} \\
{^ - O - S - O - S - {O^ - }} \\
{\,\,\,\,\,\,\,\,\,||\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,||\,\,\,\,\,\,\,\,} \\
{\,O\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,O}
\end{array}$
No. $S-S$ linkage
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$(ii)$ Number of cyclic structural isomers with molecular formula $C_5H_{10} = Y$
$(iii)$ Number of ether with $M.F. C_4H_{10}O = Z ;X + Y + Z$ is
