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Standard XII

Chemistry

Introduction to Aromatic Compounds

The present i...

Question

The _________ present in the compound is oxidised to water which condenses on the cooler parts of the test-tube or in the bulb of delivery tube :

Hydrogen

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Copper

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Carbon soot

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None of the above

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Solution

The correct option is A Hydrogen
The given organic compound is mixed with dry copper oxide ( $C u O$ ) and heated in a hard glass tube. The products of the reaction are passed over (white) anhydrous copper sulphate and then bubbled through lime water. If copper sulphate turns blue due to the formation of $C u S O_{4} .5 H_{2} O$ (by water vapor) then the compound contains hydrogen. If lime water is turned milky by $C O_{2}$ , then the compound contains carbon.

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