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Depression in Freezing Point

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Question

What is the meaning of acetylation of acetic acid in preparing aldehydes by oxidising the alkyl group of benzene.

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Solution

Acetylation is defined as the process in which an acetyl group is introduced in a molecule. This can be done either by using acetic anhydride or by using acetyl chloride.

Acetic acid in the presence of dehydrating agent (P₂O₅) gets converted to acetic anhydride.
Methyl benzene under goes oxidation in the presence CrO₃ and acetic anhydride gives benzaldehyde.

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Q. Aldehydes, ketones and acids contain

C O

group.
(a) Name the product obtained by the reaction between Acetic acid and Ethanol.
(b) Give any two tests to distinguish between aldehydes and ketones.

Q. The freezing pint of benzene decreases by

{0.45}^{o} C

0.2 g

of acetic acid is added to

20 g

of benzene. If acetic acid is associates to form a dimer in benzene, find the percentage association of acetic acid in benzene.

(K_{f} f o r b e n z e n e = 5.12 k g m o l^{- 1})

Q. The freezing point of benzene decreases by

{0.45}^{o} C

0.2 g

of acetic acid is added to

20 g

of benzene. If acetic acid associates to form a dimer in benzene, percentage association of acetic acid in benzene will be :
(

K_{f}

= 5.12 K k g m o l^{- 1}

)

Q. The freezing point of a solution containing

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g of acetic acid in

20.0

g benzene is lowered by

{0.45}^{o} C

. The degree of association of acetic acid in benzene is:

[Assume acetic acid dimerizes in benzene and

K_{f}

= 5.12

^{- 1}

]

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