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Question

The molecular mass of acetic acid dissolved in water is $$60$$ and when dissolved in benzene it is $$120.$$ This difference in behaviour of $$CH_3COOH$$ is because

A
Acetic acid fully dissolves in benzene
B
Acetic acid does not fully dissolve in water
C
Acetic acid does not ionize in benzene
D
Water prevents association of acetic acid
Solution
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Correct option is A. Water prevents association of acetic acid
Acetic acid (molar mass 60 g/mol) dimerizes in benzene due to the presence of hydrogen bonding between its molecule hence the molecular weight becomes double than that of normal value. while Water prevents the association of acetic acid.

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Q1
The molecular mass of acetic acid dissolved in water is $$60$$ and when dissolved in benzene it is $$120.$$ This difference in behaviour of $$CH_3COOH$$ is because
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Q2
Acetic acid (CH3COOH) associates in benzene to form double molecule. 1.75 g of acetic acid when dissolved in 100 g of benzene raised the boiling point by 0.46C. The degree of association of acetic acid in benzene is (Kb=2.57 K kg mol1).
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Q3

Acetic acid undergoes dimerisation, when dissolved in benzene (as shown in figure)
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Which among the following relation is correct?
(where, α = degree of association,
d = observed vapour density,
D = Theoretical vapour density).


656940_9bd773c8a3864ca898e74a45ba7a1408.png
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Q4
Acetic acid, when dissolved in water, it dissociates into ions reversibly because it is a:
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Q5

Acetic acid dissolved in benzene shows a molecular weight of:


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