Question

What are X and Y respectively in the following reaction sequence? 

• A.

  

• B.

  

• C.

  

• D.

  

Hint:

When an alkene is oxidized by KMnO_4, the oxidation usually introduces hydroxyl groups. The subsequent dehydration of alcohols commonly yields alkenes.

Answer 1

The Correct Option is A

In the given reaction sequence, isopentane is treated with KMnO_4, which is a strong oxidizing agent. KMnO_4 oxidizes the alkyl chain of isopentane to produce a hydroxylated intermediate (X). This results in the formation of 2-methyl-2-butanol as X. When 2-methyl-2-butanol undergoes dehydration, it forms 2-methyl-1-butene (Y), a major product. Thus, the correct answer is option (1), where X is 2-methyl-2-butanol, and Y is 2-methyl-1-butene.