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What are the names of the isomers for C4H8Br2?

Answer 1

Well, I can find 9 isomers, if we do NOT count R/S.

The 2,3-dibromobutane would have free bond rotation about the C2-C3 bond, which is indicated with the "resonance" double arrow.

The general process was to shift the bromide around while taking symmetry into account, and then shift the methyl around while accounting for symmetry, and fill in any gaps you have left.

Names:
1,4-dibromobutane
1,3-dibromobutane (+ R/S)
1,3-dibromo-2-methylpropane
1,2-dibromobutane (+ R/S)
1,2-dibromo-2-methylpropane
2,3-dibromobutane (+ R/S)
1,1-dibromobutane
2,2-dibromobutane
1,1-dibromo-2-methylpropane

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Answer 2

Emilia Alvarez

The isomers for C4H8Br2 are:

1,2-Dibromobutane
1,3-Dibromobutane
2,3-Dibromobutane

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.