Answer:
Aldehydes can be obtained in
quantitative yield by the oxidation of primary alcohols provided these are removed
from the reaction mixture as soon as they are formed to prevent their further
oxidation to carboxylic acids.
Since aldehydes having boiling points
less than 373 K (b.p. of \[{{H}_{2}}O\]) can be easily removed by distillation,
therefore, propanal (b.p. 323 K) can be easily prepared from propanol-1 by distilling
it from the alcohol- acid dichromate solution.
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