Question

(xviii) acetic anhydride from ethanol ?

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Answer 1

Answer:

Yes it is possible to prepare acetic anhydride from ethanol by the following process.

Explanation:

This process involve three steps .:

STEP.:.1:.

First of all by oxidation convert the ethanol (alcohol) to ethanal (aldehyde)

$ethanol + |0| \frac{k2cr2o7}{h2so4} = = > ethanal$

STEP.:.2:.

On further oxidizing ethanal (aldehyde) is converted into etanoic acid (carboxylic acid)

$ethanal + |0| \frac{k2cr2o7}{h2so4} = = > ethanoic \: acid$

STEP.:.3:.

Then finally the carboxylic acid is dehydrated to form acid anhydride by heating the ethanoic acid (also known as acetic acid) with a dehydrating agent such as P2O5

$ethanoic \: acid \: \frac{ p2o5 \: \: }{ - h2o \: \: } > acetic \: anhydride$