Question
Predict the % product formation in the given reaction :
This question was previously asked in
CUET PG 2026 Agri-Business Management Question Paper (25-Mar-2026) (Shift 2)
The correct answer is
X = 71%, Y = 29%
To determine the % product formation in the given reaction, let's analyze the reaction step-by-step:
The reaction given is a dehydrohalogenation reaction involving the elimination of HBr from the compound using alcoholic KOH as a base. This type of reaction typically forms alkenes.
Let's look into the possible products:
- The starting compound is 2-bromo-2-methylbutane, which can undergo elimination to form two different alkenes:
- (X) CH3CH=C(CH3)2
- (Y) CH3CH2C(CH3)-CH=CH2
- According to Zaitsev's rule, the more substituted alkene is usually the major product in an elimination reaction. In this case:
- (X) is more substituted compared to (Y), making (X) the major product.
Given the options provided:
- X = 71%, Y = 29%
- X = 29%, Y = 71%
- X = 50%, Y = 50%
- X = 0%, Y = 100%
The correct answer is X = 71%, Y = 29%, because product (X) is favored due to it being the more substituted alkene, consistent with Zaitsev's rule.
Therefore, the major product is (X) with a formation percentage of 71%, while the minor product is (Y) with a formation percentage of 29%.
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