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Yes, you wouldn't be able to tell if you were just given the molecular formula. Cis-trans isomerism is when there is a double bond and therefore restricted rotation, since pi bonds can't be rotated without being broken. Cis indicates that the functional groups appear on the same side of the double bond, whereas trans indicates that they appear on opposite sides.
yes, and it would by looking at where the isomer is. the isomer where the two methyl groups are on the same side of the double bond is called “cis”, and the isomer where the two methyl groups are on the opposite side is called “trans”.
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