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Q.

10ml of an alkane on complete combustion gave 40ml of CO2 under the same conditions. The formula of the alkane is

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a

C2H6

b

C5H12

c

C4H10

d

C3H8

answer is D.

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Detailed Solution

All the carbon from the hydrocarbon is in the CO2. It is given that 10ml of alkane produces 40ml of CO2.

So, the ratio of alkane(CnH2n+2) and CO2 is 1:4.

1 mole of hydrocarbon has four moles of carbon.

i.e. n=4

So, the formula of alkane is C4H10.

Therefore, option D is correct.

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