Explanation:
1) 2 - hexene => six carbon chain with a double bond linking carbons number 2 and 3.
2) 6 bromo => Br bonded to carbon number 6
3) 2,3 dimethyl => one CH3 bonded to carbon 2 and one CH3 bonded to carbon 3
Final structure:
CH3 Br
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CH3 - C = C - CH2 - CH2 - CH2
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CH3
