MCQ
Zero dipole moment is present in
- A$N{H_3}$
- B${H_2}O$
- C$cis\, 1, \,2-dichloroethene$
- ✓$trans\, 1,\, 2-dichloroethene$
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$(i)$ $\begin{gathered}
HCN\left( {aq} \right) + {H_2}O\left( l \right) \rightleftharpoons {H_3}{O^ + }\left( {aq} \right) + C{N^ - }\left( {aq} \right) \hfill \\
{K_a} = 6.2 \times {10^{ - 10}} \hfill \\
\end{gathered} $
$(ii)$ $\begin{gathered}
C{N^ - }\left( {aq} \right) + {H_2}O\left( l \right) \rightleftharpoons HCN\left( {aq} \right) + O{H^ - }\left( {aq} \right) \hfill \\
{K_b} = 1.6 \times {10^{ - 5}} \hfill \\
\end{gathered} $
These equilibria show the following order of the relative base strength
| List $-I$ (Molecule / Species) | List $-II$ |
| $(P)$ $NO_2$ (Unpaired electron in) | $(1)$ Vacant $p-$ orbital involved in hybridization |
| $(Q)$ $B_2H_6$ | $(2)$ $sp^2-$ orbital |
| $(R)$ $ClO_3$ (Unpaired electron in) | $(3)$ $sp^3-$orbital |
| $(S)$ $CH_3^+$ | $(4)$ $120^o$ Bond angle |
