MCQ
Which of the following reactions represent $(s)$ redox process?
- AElectrochemical process for extraction of highly reactive metals and non $-$ metals.
- BManufacturing of caustic soda.
- CCorrosion of metals.
- ✓All of the above.
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$H_2C = C = CH - CH = O$
$sp^3$ - $sp^2$ - $sp$


$\mathop {{H_3}C\mathop C\limits^ \ominus {H_2}}\limits_{(i)} \,,$$\mathop {{H_2}C = \mathop C\limits^ \ominus H}\limits_{(ii)} $ and $\mathop {H - C \equiv \mathop C\limits^ \ominus }\limits_{(iii)} $
is in the order of