Make up the equation of reactions: a) methane → methanol → bromomethane ↓ acetylene → ethanal

Make up the equation of reactions: a) methane → methanol → bromomethane ↓ acetylene → ethanal → acetic acid → ethyl ester of acetic acid; b) ethane → chloroethane → ethanol → diethyl ether ↓ carbon dioxide Indicate the belonging of each substance to the class of organic compounds.

Here are the records of the reaction equations:
a) CH4 + Cl2 = CH3Cl + HCl – chloromethane (alkanes) is released;
CH3Cl + KOH = CH3 – OH + KCl – methanol (alcohol) was obtained;
CH3OH + HBr = CH3Br + H2O – bromomethane (alkanes) formed;
2CH3Br + 2Na = 2NaBr + C2H6 – ethane (alkanes) is released;
C2H6 = C2H4 + H2 – obtained ethylene (alkenes);
C2H4 = H2 + C2H2 – acetylene (alkynes) released;
C2H2 + H2O = H2C = CHOH (vinyl alcohol) = H3C – CHO – ethanal (aldehyde) was obtained;
Н3С – СНО + Ag2O = CH3 – COOH + 2Ag – acetic acid (carboxylic acid) is released;
CH3COOH + C2H5 – OH = CH3COO – C2H5 + H2O – ethyl acetate was formed (ester).
b) C2H6 + Cl2 = C2H5Cl + HCl – obtained chloroethane (alkanes);
C2H5Cl + KOH = C2H5 – OH + KCl – ethanol (alcohol) is released;
C2H5 – OH + C2H5 – OH = C2H5 – O – C2H5 + H2O – diethyl ether (ether) was formed;
C2H5 – O – C2H5 + H2O = 2C2H5 – OH – ethanol (alcohol) was obtained;
С2Н5 – ОН + 3О2 = 2СО2 + 3Н2О – carbon dioxide and water are released.