Doubt from formula confirmation

What is the right formula of bleaching powder
Is it CaOCl2 or it is Ca(OCl)2

Second one I guess

But I am using CaOCl2 mostly. Any reason for 2nd one

I was unable to imagine first one structure ...
Second one is ionic compound like this

Clearly it’s the second one


Why so?

Also 2Ca(OH)2 + 2Cl2 β€”β€”β€”βŸ© Ca(OCl)2 + CaCl2 + 2H2O
And other one is in book pic

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Ok.
Then is it wrong to say that Ca(OCl)2 is the only formula of bleaching powder ?

Yes , and sorry for post#5