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A student takes about 2ml of ethanoic ac...

A student takes about 2ml of ethanoic acid in a test tube and adds a pinch of `NaHCO_3` to it. He reports the following.
Immediately a colourless and odourless gas evolves with a brisk effervescene.
The gas turns lime water milky
The gas burns with an explosion when a burning splinter is brought near it
The gas extinguishes the burning splinter.

A

I,iiand iv

B

I,iii and iv

C

ii,iii and iv

D

I,ii and iii

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