MCQ
The incorrect statement among the following is
- ✓$C_ {60}$ is an allotropic form of carbon
- B$O_3$ is an allotropic form of oxygen
- C$S_8$ is the only allotropic form of sulphur
- DRed phosphorus is more stable in air than white phosphorus
No. of $\pi-$ bonds $=4$
(b)
No. of $\pi-$ bonds $=4$
Total $\pi-$ bonds $=8$
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$\begin{array}{*{20}{c}}
{C{H_3} - CH - CH - C{H_2} - C{H_3}} \\
{\,\,\,|\,\,\,\,\,\,\,\,\,\,\,\,\,\,|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \\
{\,\,CN\,\,\,\,\,\,\,\,\,CH = C{H_2}\,\,}
\end{array}$


Product $(A)$ is
$(A)$ Hydrated $Al _2 O _3$ precipitates, when $CO _2$ is bubbled through a solution of sodium aluminate.
$(B)$ Addition of $Na _3 AlF _6$ lowers the melting point of alumina.
$(C)$ $CO _2$ is evolved at the anode during electrolysis.
$(D)$ The cathode is a steel vessel with a lining of carbon.