Which of the following is correct order of acidic character
H2O>C2H2>C2H6>C2H4
K2H2>C2H4>C2H6>H2O
H2O>C2H2>C2H4>C2H6
C2H2>H2O>C2H4>C2H6
H2O>HC≡CH>H2C=CH2>CH3−CH3