Question
How will you bring about the following conversion?
Ethane to bromoethene.
Ethane to bromoethene.
✓
Answer
Ethane to bromoethene.
$\text{HC}_3-\text{HC}_3\xrightarrow[\text{or heat}]{\text{Br}_2/\text{UV light}}\text{CH}_3-\text{CH}_2\text{Br}+\text{HBr}\ \\ \text{Ethane}\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{Bromoethane}\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ -\text{HBr}\Bigg\downarrow\text{KOH(alc),}\Delta\\ \ \ \text{BrCH}_2-\text{CH}_2\text{Br}\xleftarrow{\text{Br}_2/\text{CCl}_4}\text{CH}_2\equiv\text{CH}_2\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \\ \ \ \text{vic-Dibromide}\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{Ethene}\\ \ \ \ \ \Delta\Bigg\downarrow\text{KOH(alc)}\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \\ \ \ \text{CH}_2= \text{CHBr}\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \\ \ \ \text{Bromoethane}\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ $
$\text{HC}_3-\text{HC}_3\xrightarrow[\text{or heat}]{\text{Br}_2/\text{UV light}}\text{CH}_3-\text{CH}_2\text{Br}+\text{HBr}\ \\ \text{Ethane}\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{Bromoethane}\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ -\text{HBr}\Bigg\downarrow\text{KOH(alc),}\Delta\\ \ \ \text{BrCH}_2-\text{CH}_2\text{Br}\xleftarrow{\text{Br}_2/\text{CCl}_4}\text{CH}_2\equiv\text{CH}_2\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \\ \ \ \text{vic-Dibromide}\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{Ethene}\\ \ \ \ \ \Delta\Bigg\downarrow\text{KOH(alc)}\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \\ \ \ \text{CH}_2= \text{CHBr}\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \\ \ \ \text{Bromoethane}\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ $
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