Answer: 2- METHYLPENTANE
Step-by-step explanation:
general formula for alkanes is CnH(2n+2)
count the number of carbon atoms in the longest carbon chain which is 5 carbon atoms so
1 carbon atom - meth
2 carbon atoms- eth
3 carbon atoms- prop
4 carbon atoms- but
5 carbon atoms- pent
therefore its pentane
to substitute group is CH3 (which is methyl) and it is connected to the 2nd carbon atom in the longest carbon chain so the name is
2-methylpentane