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COMEDK20269 May 2026Morning ShiftChemistryHaloalkanes and HaloarenesActual

Identify the compounds A and B from the following reaction sequence:

Correct answer

1

Step-by-step solution

The final products of reductive ozonolysis of compound B are acetaldehyde ( CH ₃ CHO ) and 2-butanone ( CH ₃ CH ₂ COCH ₃ ). To find the structure of alkene B, we join the carbonyl carbons of the products with a double bond: CH ₃ CH = O + O = C ( CH ₃) CH ₂ CH ₃ reconstruct CH ₃ CH = C ( CH ₃) CH ₂ CH ₃ Thus, B is 3-methylpent-2-ene. Compound A undergoes dehydrohalogenation with alcoholic KOH to give B as the major product. According to Saytzeff's rule, the major product is the most substituted alkene. Now check the

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