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JEE Main levelNumerical answerDifficulty 2 of 3o4120

3-Bromo-3-methylhexane, $CH X_{3} CH X_{2} - C (CH X_{3}) (Br) - CH X_{2} CH X_{2} CH X_{3}$ , undergoes E1 elimination. Assume no carbocation rearrangement occurs. How many distinct alkenes can be formed in total? Count E and Z isomers of an alkene as separate compounds.

Numerical answer type, tolerance 0.5.

Answer: 5

Beta-hydrogens are on three different carbons. Loss from the ethyl

CH X_{3}

gives 3-methylhex-2-ene (E and Z, 2). Loss from the methyl group gives 2-ethylpent-1-ene (1). Loss from the propyl

CH X_{2}

next to the cation carbon gives 3-methylhex-3-ene (E and Z, 2). Total

2 + 1 + 2 = 5

.

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