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4.

1) A

2) В

3) Г

4) Б

5.  

C2H6O - w(C) = 38.7%; w(H) = 9.7%; w(O) = 51.5%

H2CO3 - w(C) = 19.3%; w(H) = 3.2%; w(O) = 77.3%

CH3OH - w(C) = 37.5%; w(H) = 12.6%; w(O)= 49.9%

6.

C6H12O6 - w(C) = 40%; w(H) = 6.7%; w(O) = 53.3%