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Question

In which compound among the following, carbon has a zero oxidation state?

A
CH4
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B
CH3Cl
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C
CH2Cl2
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D
CCl4.
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Solution

The correct option is C CH2Cl2
Sum of total oxidation state of all atoms = Overall charge on the compound.
Oxidation state of Cl is 1.Let oxidation state of C be x.
For CH4, applying above formula, x+4(1)=0,x=4.
For CH3Cl, applying above formula, x+3(1)+1(1)=0,x=2.
For CH2Cl2, applying above formula, x+2(1)+2(1)=0,x=0.
For CCl4, applying above formula, x+4(1)=0,x=+4.
oxidation state is 0 for C in CH2Cl2

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