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2-Bromopentane is heated with potassium ethoxide in ethanol. The major product obtained is

1. 2-ethoxypentane
2. pentene-1
3. trans-2-pentene
4. cis-pentene-2

Correct answer: trans-2-pentene

Solution

When 2-bromopentane reacts with potassium ethoxide in ethanol, an elimination reaction (E2 mechanism) occurs, favoring the formation of the more stable trans-2-pentene as the major product due to its lower steric hindrance.

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