Question

All possible Isomers of Bromopentane. Actually there are 8 possible isomers for it. Please let me know if anyone knows all 8.

Answer 1

So pentane can either have 5 carbonsin a straight chain, or it can be branched. Pentane has two possible branched structures: 2-methylbutane("isopentane") and 2,2-dimethylpropane ("neopentane"). For 2-methylbutane, the possibilities for combining with bromine are: 1-bromo-2-methylbutane.
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