Oxidation number of carbon in a given compound

1. A.
   $-2$
2. B.
   $-3$
3. C.
   $+3$
4. D.
   $+4$

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1. A.
   -2
2. B.
   $\ + 2$
3. C.
   zero
4. D.
   $\ + 4$

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1. A.
   $+2$
2. B.
   $+3$
3. C.
   $+4$
4. D.
   $+6$

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1. A.
   $\mathrm{CH_4}$
2. B.
   $\mathrm{CCl_4}$
3. C.
   $\mathrm{CF_4}$
4. D.
   $\mathrm{CO_2}$

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