NEET
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- NEET
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- Haloalkanes and Haloarenes
NEET · Chemistry · Haloalkanes and Haloarenes
Given below are two statements: Statement-I : 2-Bromo pentane on...
Given below are two statements:
Statement-I : 2-Bromo pentane on reaction with alcoholic KOH gives 1-pentene as a major product.
Statement-II : In dehydrohalogenation reactions the preferred product is always that alkene which has lesser number of alkyl groups attached to the doubly bonded c -atoms.
In the light of the above statements, choose the most appropriate answer from the options given below:
Options
- ABoth statements-I and II are correct.
- BStatement-I is correct but Statement-II is incorrect.
- CBoth Statement-I and II are incorrect
- DStatement-I is incorrect but Statement-II is correct.
Correct answer
C. Both Statement-I and II are incorrect
Step-by-step solution
Statement-I is incorrect because 2-Bromo pentane on reaction with alcoholic KOH gives 2-pentene as the major product, not 1-pentene.
Statement-II is correct because in dehydrohalogenation reactions, the preferred product is indeed the alkene with the lesser number of alkyl groups attached to the doubly bonded carbon atoms, following Zaitsev's rule.
Zaitsev's rule states that in elimination reactions, the more stable alkene (with more alkyl groups) is formed, but in this case, it's actually the less stable alkene that's formed because of the reaction conditions (alcoholic KOH). However, the statement-II itself is correct in general.