The molecular weight of A is 72, and A only contains two elements, C and H, with a mass ratio of 5: 1. The number of carbon atoms in A is 72×5 1+5÷ 12=5, and the number of H atoms is 72× 1 1+5. They are n-pentane, isopentane and neopentane. The highest boiling point is n-pentane, and only one monochloroform is neopentane. B is an oxygen derivative of hydrocarbon, and there is only one functional group in the molecule, so silver mirror reaction can occur. It shows that B contains an aldehyde group, and the formula amount of aldehyde group is 29, so the formula amount of hydrocarbon group is 72-29=43, so the hydrocarbon groups are C3H7- and C3H7-.

CH3CH2CH2CHO or (CH3)2CHCHO. C can react with sodium bicarbonate to release carbon dioxide, indicating that there are carboxyl groups in C, and the amount of carboxyl groups is 45, so the amount of alkyl groups is 72-45=27, and there should be two C3 H, so it is vinyl.

Therefore, C is CH2=CHCOOH, and E is a high molecular compound, so E generated by CE addition polymerization is polyacrylic acid, and G generated by the reaction of E with methanol is methyl polyacrylate.

The molecular weight of (1)A is 72, and A only contains C and H? Two elements, and the mass ratio is 5: 1, the number of carbon atoms in molecule A is 72×5 1+5÷ 12=5, and the number of H atoms is 72×1+5 ÷/kloc-.

So the answer is: c5h12; ; 3; ch 3c H2 ch 2ch2 ch 3； Neopentane or 2,2-dimethylpropane;

(2)B is an oxygen-containing derivative of hydrocarbon, with only one functional group in the molecule, which can produce silver mirror reaction, indicating that B contains aldehyde group, and the molecular weight of aldehyde group is 29, so the molecular weight of hydrocarbon group is 72-29=43, so there are two kinds of hydrocarbon groups, namely, C3H7- and C3H7-, which are propyl and isopropyl, so the structural formula of B is CH3CH2CH2CHO? Or (CH3)2CHCHO. ..

So the answer is: ch3ch2ch2cho; ; (CH3)2ch CHO；

(3)C can react with sodium bicarbonate to release carbon dioxide, indicating that there are carboxyl groups in C, and the molecular weight of carboxyl groups is 45, so the molecular weight of hydrocarbon groups is 72-45=27, which should have 2 C and 3 H, so it is vinyl.

So c is CH2=CHCOOH, and e is a polymer compound. Therefore, E produced by addition polymerization of C is polyacrylic acid, and G produced by reaction of E with methanol is methyl polyacrylate.

So the answer is: ① CH2 = chcooh; ②+nCH3OH catalyst heating+NH2O; Esterification or substitution reaction.