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Question

A small piece of sodium metal is added to a neutral organic liquid, taken in a dry test-tube. Bubbles of a gas 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.

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Solution

(a) When we treat ethanol with sodium metal, sodium ethoxide is formed and hydrogen gas is released.

C2H5OH+NaheatC2H5ONa+H2

So, the functional group present in the organic compound will be alcohol (OH).

(b) Ethanol (C2H5OH) has the functional group alcohol.

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