Answer:
3-bromopentane
Step-by-step explanation:
First, try to find the longest chain of carbons, which happens to be 5 carbon atoms long. A straight 5 carbon alkane is called pentane, so the IUPAC name will have pentane or some variation of it. Next, look for anything that is not part of the pentane chain you found. There is a bromine atom in the middle. From left to right label each of the carbons in increasing order using the numbers 1 through 5, and do the same from right to left. Bromine is on carbon number 3 in both cases (left to right and right to left), so the location of the bromine is 3. Since bromine is a substituent (meaning that the bromine is replacing the place of a hydrogen atom in a normal pentane molecule), the name is changed to bromo. The number goes first, so 3, then the name of the substituent, so bromo, then the longest chain, pentane. The final answer should be:
3-bromopentane (also add remember to add dash between 3 and bromo to show that the bromine is on carbon number 3)