Question

Two isomeric compounds A and B have carbon 52.17%.
Hydrogen 13.04% and the rest being oxygen If their mol mass
is 46 find the molecular formula. Also draw the structures of A
and B and name the type of isomerism​

Answer 1

Carbon ; number of moles = 52.17/12

=4.34

Hydrogen ; number of moles = 13/1

=13

Oxygen ; number of moles = 34.83/16

= 2.17

Relative ratios ; Carbon : 4.34/2.17

= 2

Hydrogen : 13/12.7

= 6

Oxygen : 2.17/2.17

= 1

Empirical formula is C²H6O

The molar mass = 2× vapour density

=2×23 = 46

The compound is C2H5OH

That is ethanol since it gives positive iodoform test.

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