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# $CO_2$ is isostructural with

$\begin{array}{1 1}(a)\;H_2O&(b)\;SO_2\\(c)\;SnCl_2&(d)\;C_2H_2\end{array}$

$CO_2,C_2H_2$ are in linear shape.
$O=C=O,H-C\equiv C-H$
Hence (d) is the correct answer.