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Answer:
Explanation: The image shows a question that asks to identify the compound that shows cis-trans isomerism.
Cis-trans isomerism is a type of geometric isomerism that occurs when two identical groups are attached to the same carbon atom, and the two groups can be on the same side (cis) or opposite sides (trans) of the carbon atom.
Of the four compounds listed, only 2-butene can show cis-trans isomerism. This is because 2-butene has two identical methyl groups attached to the same carbon atom. The two methyl groups can be on the same side (cis-2-butene) or opposite sides (trans-2-butene) of the carbon atom.
The other three compounds cannot show cis-trans isomerism:
Ethane is a symmetrical molecule, so there is no difference between the cis and trans isomers.
2-methylpropane has two different groups (methyl and ethyl) attached to the same carbon atom, so there is no cis-trans isomerism.
2-pentyne has a carbon-carbon triple bond, which is linear, so there is no cis-trans isomerism.
Therefore, the answer to the question is 2-butene.