A small piece of sodium metal is added to a organic liquid `C_2H_6O`, taken in a dry test-tube. Bubbles are produced in the test-tube. When a burning match-stick is brought near the mouth of the test-tube, the gas burns with a 'pop' sound, making a little explosion
(a) Name the functional group present in the organic liquid.
(b) Write the name and formula of an organic liquid having this functional group.