Question

Number of alkyl chloride (including stereoisomers) which on reaction with alcoholic KOH gives 2-
Methylbut-2-ene as a major product : (By E-2 mechanism)

Answer 1

Answer:

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Answer 2

2-chloro-3-methyl-butane and its stereoisomers

Explanation:

• E2 is a bimolecular elimination reaction. It involves a single step .
• In an E2 elimination reaction , an alkyl chloride on reaction with alcoholic KOH gives alkene or substituted alkene as the major product.
• Normally, primary substituted alkyl halides undergo this reaction but there are certain possible secondary alkyl halides which also undergo E-2 elimination.
• In this case , the desired product is 2-methyl-but-2ene ,$CH_3C(CH_3)=C(H)CH_3$. If 2-chloro-3methyl-butane is the substrate then the desired product can be obtained.
• The 4 stereoisomers of the substrate have been shown in the image attached.