Which of the following is the correct representation of cis-2-butene?

Which of the following is the correct representation of cis-2-butene?

Step 1: Understand that cis-2-butene is an alkene, which means it has a double bond.
Step 2: Identify the carbon atoms in butene. Butene has four carbon atoms (C1, C2, C3, C4).
Step 3: Recognize that the '2' in cis-2-butene indicates that the double bond is between the second and third carbon atoms (C2=C3).
Step 4: Note that 'cis' means that the two methyl groups (CH3) are on the same side of the double bond.
Step 5: Draw the structure: Place the two methyl groups (CH3) on the same side of the double bond between C2 and C3.
Step 6: Write the full structure: The correct representation is CH3-CH=CH-CH3, with the two CH3 groups on the same side.

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