Carbon present in the compounds is oxidised to carbon dioxide which:

turns blue litmus red

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turns lime water milky

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turns solution to green

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has no effect on solution

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Solution

The correct option is B turns lime water milky
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 vapour) then the compound contains hydrogen. If lime water is turned milky by $C O_{2}$ , then the compound contains carbon.

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