What is the number of possible structural isomers for bromopentane?
A) 1
B) 3
C) 6
D) 8

Bromopentane (C5H11Br) can have multiple structural isomers based on the arrangement of the carbon atoms and the placement of the bromine atom. To determine the number of possible structural isomers, we can systematically go through the different possibilities:

1-Bromopentane: This is the straight-chain isomer where the bromine atom is attached to the first carbon atom.

2-Bromopentane: In this isomer, the bromine atom is attached to the second carbon atom.

3-Bromopentane: The bromine atom is attached to the third carbon atom.

2-Methyl-1-bromopentane: This is an isomer where the bromine atom is attached to the first carbon atom, and there is a methyl group attached to the second carbon atom.

2-Methyl-2-bromopentane: In this isomer, the bromine atom is attached to the second carbon atom, and there is a methyl group attached to the second carbon atom as well.

3-Methyl-1-bromopentane: The bromine atom is attached to the first carbon atom, and there is a methyl group attached to the third carbon atom.

3-Methyl-2-bromopentane: In this isomer, the bromine atom is attached to the second carbon atom, and there is a methyl group attached to the third carbon atom.

3-Methyl-3-bromopentane: The bromine atom is attached to the third carbon atom, and there is a methyl group attached to the third carbon atom as well.

So, there are a total of 8 possible structural isomers for bromopentane. Therefore, the correct answer is D) 8.