A student takes about 2 ml ethanoic acid in a dry test tube and adds a pinch of sodium hydrogen carbonate to it. He reports the following observations
1) Immediately a colourless and odourless gas evolves with a brisk effervescence
2) The gas turns lime water to milky when passed through it.
3) The gas burns with an explosion when a burning splinter is brought near to it.
4) The gas extinguishes the burning splinter that is brought near to it
A) 1, 2, 3
B) 2, 3, 4
C) 3, 4, 1
D) 1, 2, 4
