H2o = neutral = water Ch3oh = none = methanol Koh = strong base = potassium hydroxide Cscl= salt = cesium chloride H2so4 = strong acid = sulfuric acid C12h22o11 = none = sucrose C6h6 = none = benzene Ni(no3)2 = salt= nickel(II) nitrate K2so4= salt = potassium sulphate H2co3 = weak acid = carbonic acid Hope this helps you!
C2H4 is CH2=CH2, it has one double bond that means it has pi electrons.