Assertion: Chemical formula of Bleaching powder is CaOCl2.
Reason: Calcium oxide reacts with chlorine to form bleaching powder.

Dear student

Bleaching powder is Calcium Oxychloride (CaOCl2)

The common name of calcium Oxychloride is bleaching powder and its chemical formula is CaOCl2. It is prepared by the action of chlorine gas on dry slaked lime [Ca(OH)2]. Hence, the raw material required for the preparation of bleaching powder are chlorine gas and dry slaked lime. 

Following is the equation for preparation of the compound

Ca(OH)2 + Cl2 → CaOCl2 + H2O
Calcium hydro-oxide reacts with chlorine to form bleaching powder not calcium-oxide.
Hence Option C is correct.
Hope it is clear

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