The number of possible monobromination products, including cis-trans isomers, of methylcyclopentane is

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Monobromination of methylcyclopentane can occur at any of the five different carbon atoms: the one bearing the methyl group and the four in the cyclopentane ring. Each position leads to a unique product, resulting in a total of 5 possible monobromination products. There are no cis-trans isomers in this case because the introduction of a bromine atom does not create any situation where cis-trans isomerism is possible (it would require a double bond or a ring structure where substituents can be on either side, which is not applicable here).

The Number of Possible Monobromination Products, Including Cis-Trans Isomers, of Methylcyclopentane