$NaH$ is an example of:

The hydride that is $NOT$ electron deficient is

Spin isomerism is shown by

Observe the following reactions:
$I$. $CO_{(g)} + H_{2(g)} \xrightarrow{X} HCHO_{(g)}$
$II$. $CO_{(g)} + 3 H_{2(g)} \xrightarrow{Y} CH_{4(g)} + H_2O_{(g)}$
The catalysts $X$ and $Y$ in the above reactions are respectively:

Which is distilled first?

Give the chemical reaction for the preparation of producer gas.