How many chiral centers are in the following compound ?

Column $-I$	Column $-II$
$(A)$ Ionisation potential	$(P)\; O < F < N$
$(B)$ Electronegativity	$(Q)\; N < O < F$
$(C) \;Z_{eff}$	$(R) \;O < N < F$
$(D)$ Electron affinity	$(S)\; N < C< O$

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The difference in energy between the molecular orbital formed and the combining atomic orbitals is called

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Which of the following compound has plane of symmetry ?

$\begin{array}{*{20}{c}}
{R = - CH - Cl}\\
{|\,\,}\\
{\,\,\,\,C{H_3}}
\end{array}\,\,\,\,,\,\,\,\,\,\,\,\,\,\,\begin{array}{*{20}{c}}
{S = - CH - Cl}\\
{|\,\,}\\
{Br}
\end{array}$

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Incorrect order of ionisation energy is

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$HCl$ does not show peroxide effect since
$C{{H}_{3}}-CH=C{{H}_{2}}+\overset{\centerdot }{\mathop{X}}\,\to C{{H}_{3}}-\overset{\centerdot }{\mathop{C}}\,H-C{{H}_{2}}X$ $(I)$
$C{{H}_{3}}-\overset{\centerdot \,\,\,\,}{\mathop{CH}}\,-C{{H}_{2}}X+H-X\to C{{H}_{3}}-C{{H}_{2}}-C{{H}_{2}}X+\overset{\centerdot }{\mathop{X}}\,$ $(II)$

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The enthalpy change at $298\,K$ for decomposition is given in the following two steps

Step $I\,\,:$ ${H_2}O(g)\, \to \,H(g)\, + \,OH(g)\,;$ $\Delta H = 498\,kJ\,mol^{-1}$

Step $II\,\,:$ $OH(g)\, \to \,H(g)\, + \,O(g)\,;$ $\Delta H = 428\,kJ\,mol^{-1}$

The bond enthalpy of the $O-H$ bond is....$kJ\,mol^{-1}$

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Would gaseous $ HCl$ be considered as an Arrhenius acid

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