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Q.

Vapour density of an organic compound is 23. It contains 52.17% of carbon and 13% of hydrogen. The compound gives iodoform test. The compound is :

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a

ethanol 

b

dimethyl ether  

c

acetone 

d

methanol 

answer is A.

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Detailed Solution

ElementCarbonHydrogenOxygen
no. of moles52.1712=4.34131=1334.8316=2.17
Relative ratios4.342.17=2132.17=62.172.17=1

Empirical formula is C2​H6​O. 

The molar mass = 2× vapour density

                           =2×23 = 46

The compound is C2​H5​OH.

That is ethanol since it gives positive iodoform test.

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