Choose the class of inorganic compounds described by the General formula C n H 2 n:
A. alkanes
B. alkenes
C. alkynes
D. alkanols
2. Mark the correct statement about the value of proteins:
A. proteins are needed by plants as raw materials for the production of amino acids
B. living organisms use proteins as a source of energy
C. proteins are the main building material for animal cells
D. proteins are used to remove excess glucose from the body
3. Polyvinyl chloride monomer has the formula - CH 2 = CHCl. Choose the formula of the polymer:
A. (- CHCl - CHCl -) n
B. (- CH 2 - CHCl -) n
C. (- CHCl = CCl 2 -) n
4. Specify the name of the synthetic polymer:
A. nucleic acid
B. calcium carbonate
C. kapron
D. formic acid
5. Choose the correct statements:
A. cracking is used to obtain lubricants
B. kerosene - automotive fuel
C. solid residue after distillation of oil is used as asphalt
D. during cracking there is a splitting of molecules of heavy hydrocarbons
6. Indicate the sign of a qualitative reaction to polyhydric alcohols:
A. formation of a white amorphous precipitate
B. release of brown gas
C. discoloration of the solution
D. dissolution of the blue precipitate

а) CH4 -> C2H2 -> C6H6 -> C6H5Cl
1. 2СH4---(1500 C)---> C2H2+3H2
2. 3C2H2---(t и активированный уголь)-->C6H6
3. C6H6+Cl2--(t)--> C6H5Cl+ HCl
b) CaCO3 -> CaC2 -> C2H2 -> C2H4 -> C2H5Cl
1. CaCO3 + 4C = CaC2 + 3CO
2. CaC2 + H2 = Ca + C2H2
3. C2H2+H2--->C2H4
4. C2H4+HCl---> C2H5Cl
c) CH4 -> C2H6 -> C3H8 -> C6H14
1. Из CH4 Нельзя одним действием получить С2H6, значит так :
2СH4 + Cl2 = CH3Cl + HCl
2CH3Cl + 2Na = C2H6 + 2NaCl.
2. Из С2H6 Нельзя одним действием получить С3H8, значит так : 
С2H6 + Cl2 = C2H5Cl + HCl
C2H5Cl + CH3Cl +2Na = C3H8 + 2NaCl
3.  Из C3H8 Нельзя одним действием получить C6H14, значит так : 
С3H8 + Cl2 = C3H7Cl + HCl
2C3H7Cl + 2Na = C6H14 + 2NaCl

Объяснение:

По данной сокращенной ионной форме составить уравнения реакций в молекулярной форме: а) Zn2+ + S2−→ ZnS↓ ; б) Fe + Cu2+ → Fe2+ + Cu ; в) CO2 + 2OH− → CO32− + H2O ; г) Cr(OH)3 + OH− → CrO2− + 2 H2O д) NO2− + H+ → HNO2 е) 2 H+ + S2− → H2S

а) Zn2+ + S2−→ ZnS↓ ;   ZnCl2  +  Na2S   =  ZnS↓  +  2NaCl  

б) Fe + Cu2+ → Fe2+ + Cu ;   Fe + CuSO4  = FeSO4 + Cu↓

в) CO2 + 2OH− → CO32− + H2O ;  CO2 + 2NaOH = Na2CO3 + H2O

г) Cr(OH)3 + OH− → CrO2− + 2 H2O

Cr(OH)3 + KOH = KCrO2 + 2 H2O

д) NO2− + H+ → HNO2

 KNO2   +   HCl   =   HNO2   +  KCl  

е) 2 H+ + S2− → H2S       2HCl  +   Na2S      =   H2S   +   2NaCl