1.

How is nitroethane prepared from- (1) ethane (2) ethul bromide (3) acetaldoxime?

Answer»

SOLUTION :(1) Preparation of nitroethane from ethane: When EHTANE is heated with conc. Nirtic acid, nitroethane is OBTAINED.
`underset("ethane")(CH_(3))-CH_(3)-underset("conc.")(HO)-NO_(2)overset(423 K "to" 698K)(to)underset("Nitroethane")(CH_(3)-CH_(2)-NO_(2)+H_(2)O`
(2) Preparation of nitroethane from ethyl bromide: When ethyl bromide is treated with sodium nitrite in te presence of solvent dimethyl sulphoxide (DMSO).
`underset("ethy bromide")(CH_(3)-CH_(2)-Br+NaNO_(2)overset(DMSO)(to) underset("nitroethane")(CH_(3)-CH_(2))NO_(2)+NaBr`
(3) Preparation of nitroethane from acetaldoxime: When acetaldoxime is oxidised in the presence of trifluoroperoxy ACETIC acid is obtained.
`CH_(3)-underset("acetaldoxime")overset(H)overset(|)(C)=N-OH+(O)overset("trifluoroperoxy acetic acid")(to)`
`CH_(3)-overset(H)overset(|)(C)=overset(O^(-))overset(|)(N^(+))-OHhArrunderset("Nitroethane")(CH_(3)-CH_(2))-overset(O^(-))overset(+|)(N)=O`


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