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When is di- used in the name of a hydrocarbon? when the main chain contains two carbon atoms

when there are two different substituents
when there are two main chains of equal length
when there are two identical substituents

2 Answers

3 votes
D......hope it helps

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User CurveGamma
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3 votes
The answer is 'when there are two identical substituents'. 
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User Daniel Stenberg
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