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Question

Draw the Structure of 3-Bromopentane.

A
CH3CH2CH(Br)CH2CH3
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B
CH3CH2CH2CH2CH2Br
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C
Both a and b
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D
None of the above
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Solution

The correct option is A CH3CH2CH(Br)CH2CH3
Option A is correct.
There are numerous possible constitutional isomers of bromopentane. Specifically, the bromine atom can be attached to any of the carbon atoms (although there are only three unique possibilities because the 2 end carbons are identical). So you could have:
  • 1-bromopentane (same molecule as 5-bromopentane, but lower number is used)
  • 2-bromopentane (same molecule as 4-bromopentane, but lower number is used)
  • 3-bromopentane

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