Which one of the following is a different pair?

$\mathop {C{H_2} = CH - Br}\limits_{(I)} $ $\mathop {{\text{C}}{{\text{H}}_3} - Br}\limits_{\left( {II} \right)} $ $\mathop {\begin{array}{*{20}{c}}
{C{H_3} - CH - Br} \\
{|\,\,} \\
{\,\,\,C{H_3}}
\end{array}}\limits_{\left( {III} \right)} $ $\mathop {C{H_3}C{H_2}Br}\limits_{\left( {IV} \right)} $

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To inhibit the growth of tumours, identify the compounds used from the following:

$(A)$ $EDTA$ $(B)$ Coordination Compounds of $Pt$ $(C)$ $D-$Penicillamine $(D)$ Cis - Platin

Choose the correct answer from the option given below:

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Which of the following molecule contains one pair of non-bonding electrons

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The major product obtained on treatment of
$CH_3CH_2CH(F)CH_3$ with $CH_3O^-/CH_3OH$ is

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A gas undergoes change from state $A$ to state $B$. In this process, the heat absorbed and work done by the gas is $5\, J$ and $8\, J$, respectively. Now gas is brought back to $A$ by another process during which $3\, J$ of heat is evolved. In this reverse process of $B$ to $A$

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Order of first ionization potentials of elements $Li, Be, B, Na$ is