- ATrigonal bipyramidal
- ✓Square bipyramidal
- CPentagonal bipyramidal
- Ddistorted tetrahedral

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$(I)\,C{H_3}O\mathop C\limits^ \oplus {H_2}$ is more stable than $C{H_3}\mathop C\limits^ \oplus {H_2}$
$(II)\,M{e_2}\mathop C\limits^ \oplus H$ is more stable than $C{H_3}C{H_2}\mathop C\limits^ \oplus {H_2}$
$(III)\,C{H_2} = CH - \mathop C\limits^ \oplus {H_2}$ is more stable than $C{H_3}C{H_2}\mathop C\limits^ \oplus {H_2}$
$(IV)\,C{H_2} = \mathop C\limits^ \oplus H$ is more stable than $C{H_3}\mathop C\limits^ \oplus {H_2}$
In an experiment, $2.0$ $moles$ of $NOCl$ was placed in a one-litre flask and the concentration of NO after equilibrium established, was found to be $0.4$ $mol / L$. The equilibrium constant at $30^{\circ} C$ is $.......\times 10^{-4}$
$(A)$ $CO _2, C _2 H _4, NO$ and $HCl$
$(B)$ $NO _2, O _3, HCl$ and $H _2 SO _4$
$(C)$ $BCl _3, NO , NO _2$ and $H _2 SO _4$
$(D)$ $CO _2, BCl _3, O _3$ and $C _2 H _4$