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The structure is H2C=C(CH3)-CH2-CH3. The longest carbon chain containing the double bond has 4 carbons (butene). The double bond is between carbon 2 and 3. A methyl group is attached to carbon 2. Numbering from the end closer to the double bond, the double bond is at position 2, and the methyl group is at position 2. Thus, the name is 2-methylbut-2-ene.

Answer: 2-метилбут-2-ен