for problem 12 a,b, and c

15 a and b

20 all

please answer all asap

Problem 2.12 Which cycloalkanes show cis, trans isomerism? For each that does, draw both isomers. (a) (b) (c) Problem 2.15 Arrange the alkanes in each set in order of increasing boiling point. (a) 2-Methylbutane, 2,2-dimethylpropane, and pentane (b) 3,3-Dimethylheptane, 2,2,4-trimethylhexane, and nonane 2.20 E Indicate whether the compounds in each set are constitutional isomers. (a) CH3CH2OH and CH3OCH3 (b) (c) (d) (e) and CH3CH2CH2CH2CH3 (f) and CH2=CHCH2CH2CH3