Question

Find the number of unsaturated products formed in given reaction

Answer 1

2

Answer 2

Solution

1. The substrate is a cyclohexane derivative having a –Cl and a –CH₃ on one carbon (say C₂) with adjacent carbons (C₁ and C₃) being substituted by –CH₃ groups.

2. Under heat with alcoholic KOH, an E2 elimination occurs. The –Cl leaves from C₂ and a β–hydrogen is removed from either of the two adjacent carbons (C₁ or C₃).

3. This yields two different regioisomeric cyclohexene derivatives (one with the double bond between C₁–C₂ and the other between C₂–C₃).

4. In each cyclohexene product the double bond is part of the ring and fixed so that no additional E/Z isomerism is possible.

Thus, the reaction produces 2 unsaturated products.

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Explanation (minimal):

• Substrate has Cl at C₂ and β–hydrogens at C₁ and C₃.

• E2 elimination with alc. KOH removes Cl from C₂ and a hydrogen from either C₁ or C₃.

• This forms two distinct cyclohexenes (regioisomers); each double bond in the ring is fixed.