The 3d- metal ions are paramagnetic in nature because

$(I)$ $\begin{array}{*{20}{c}}
{C{H_2} - C{H_2} - C{H_2} - C{H_2}OH} \\
{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\
{N{O_2}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}
\end{array}$

$(II)$ $\begin{array}{*{20}{c}}
{C{H_3} - C{H_2} - CH - C{H_2}OH} \\
{|\,} \\
{N{O_2}}
\end{array}$

$(III)$ $\begin{array}{*{20}{c}}
{C{H_3} - CH - C{H_2} - C{H_2}OH} \\
{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\
{N{O_2}\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}
\end{array}$

$(IV)$ $CH_3-CH_2-CH_2-CH_2OH$

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$\Delta H$ and $\Delta E$ for the reaction, $Fe _{2} O _{3}( s )+3 H _{2}( g ) \rightarrow 2 Fe ( s )+ H _{2} O (l)$ at constant temperature are related as

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A dilute solution of sulphuric acid is electrolysed using a current of $0.10 \,A$ for $2\, hours$ to produce hydrogen and oxygen gas. The total volume of gases produced at $STP$ is $......\,cm ^{3}$. (Nearest integer) $\lfloor$ Given : Faraday constant $F=96500 \,C$ $mol^{-1}$ at $STP,$ molar volume of an ideal gas is $\left.22.7\, L\, mol^{-1}\right]$

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Reaction correctly matched with its name ?

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Suppose the following reaction The structure of main product will be