Question

what happens when 2- bromobutane is heated with alcoholic KOH?

Answer 1

Hii..
When 2-Bromobutane is heated with alcoholic KOH ..But-2-ene is the major product formed ..

By Saytzeff rule when an alkyl halide is heated or undergoes elimination the major product formed is Alkene ..

hope this helps!

Answer 2

Answer: when we 2- bromobutane is heated with alcoholic KOH we will get major yield of But-2ene and minor yeild of But-1-ene.

Explanation:

Haloalkanes give alkene when heated with alcoholic potassium hydroxide , Dehydrohalogenation reaction.The formation of more substituted alkene will be favored.

So, when we 2- bromobutane is heated with alcoholic KOH we will get major yield of But-2ene and minor yeild of But-1-ene.

$CH_CHBR-CH_3\overset{KOH/C_2H_5OH}\rightarrow CH_3CH=CHCH_3+CH_3CH_2CH=CH_2$