4. What is the IUPAC name of the following compound? CH3 CH3-CH2-CH2-C-CH3 -C; 1 CH3 A) 4,4-dimethylpentane B) 1-tert-butylpropane C) 2,2-dimethylpentane D) 1,1,1-trimethylbutane 5. The correct IUPAC name of the following compound is A) B) 2-ethyl-3,5-dimethylheptane. 6-ethyl-5,5-dimethylheptane. C) 3,4,4-trimethyloctane. D) 5,5,6-trimethyloctane. 6. The common name of the following group is CH3CH2CH- CH3 A) n-butyl. B) sec-butyl. C) isobutyl. D) tert-butyl