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Q.

The empirical formula of an organic gas containing carbon and hydrogen is CH2. The mass of 1 litre of this organic gas is exactly equal to that of 1 litre of N2. Therefore, the molecular formula of organic compound is:​

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a

C3H6

b

C2H4

c

C4H8

d

C6H12

answer is C.

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Detailed Solution

Molecular mass of the gas = Molecular mass of N2 = 28 g 

Molecular formula mass = n X (Empirical formula mass) 

Empirical formula mass of the gas = 12 + 2 = 14 g 

Therefore, n = 28/14 = 2 

Hence the molecular formula is (CH2)2 or C2H4. 

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