3 4-dichloro-2 5-dimethylhexane July 8, 2019 16 32 64 128 2 3-dichloro-4-methylhexane 3 3-dichloro-2 4-dimethylhexan-2-ol 3 methylhexane 2 5-dichloro-2 5-dimethylhexane melting point