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Which of the following is the correct IUPAC name of given organic compound (X)?

1. 2-Bromo-2-methylbut-2-ene
2. 1-Bromo-2-methylbut-2-ene
3. 4-Bromo-3-methylbut-2-ene
4. 3-Bromo-3-methylprop-2-ene

Correct answer: 1-Bromo-2-methylbut-2-ene

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