Answer
A. Pentane
B. 3-Methylhexane
C. 2,3-dimethylpentane
Work Step by Step
A. The entire structure is one parent strand without branches. It has 5 C atoms, so pentane is correct.
B. The longest chain has 6 C atoms, so hexane is correct. A methyl substituent exists at the third C on the parent strand.
C. The two methyl substituents can be condensed as such: 2,3-dimethylpentane. It is redundant and incorrect to write 2-methyl-3-methyl pentane
