The correct sequence of photosynthesis in green plants is:
Absorption of light by Chlorophyll → Splitting of water to H2 and O2 → Reduction of CO2 → Carbohydrate formation
In the process of photosynthesis, first sunlight is trapped by chlorophyll and this is used for the photolysis of water molecule into oxygen and hydrogen [light-dependent reaction]. This is followed by reduction of carbon dioxide into carbohydrates by various plant enzymes [light independent reaction].