Chemistry question about compounds and formulas!

Two compounds containing copper and oxygen were found to contain the following masses:
Compound A: 32.10 g Cu and 17.90 g Cl
Compound B: 23.64 g Cu and 26.37 g Cl

Are the compounds the same? if not, what is the lowest whole number mass ratio of coppper that combines with a given mass of chlorine?
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identify the incorrect names of formulas:
a) calcium (II) oxide
b) aluminum oxide
c) Na2C204
d) Mg(NH4)2

I think they are not the same cpds: How? If u sum up their weights(Compound A)=50.
Cu=32.10/50=0.642/0.358=1.8=2
Cl=0.358/0.358=1
Cu2Cl
Compound B: Cu= 23.64/50.01= 0.473.0473=1
Cl= 0.527/0.473=1
CuCl: Lowest mass number mass ratio will be 1.

A. Is wrong. It is just called Calcium Oxide.
D is also wrong. They are both positive cations so they dont combine.

32.10 / 63.5 = 0.5
17.90 / 35.453 = 0.5

CuCl

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23.64 / 63.5 = 0.37
26.37 / 35.453 = 0.74

CuCl2

Not the same compound.