Which of the following pairs of compounds illustrates the law of multiple proportions?

K O H, C s O H

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H_{2} O, D_{2} O

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C_{2} H_{6}, C_{6} H_{6}

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K C l, K B r

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Solution

The correct option is C $C_{2} H_{6}, C_{6} H_{6}$
From the given options, we can see that a, b and d have different elements in the compounds and coming to option (c) we can see that two compounds have same elements and they vary in proportion. Same number of hydrogens are present in ethane and benzene. So the number of carbon atoms should be in the whole number ratio, which follows the law of multiple proportions.

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