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Valency and Oxidation number are differe...

Valency and Oxidation number are different for an element. Valency of carbon is generally 4, however, the oxidation state may be `-4,-2 0,+2,-1` etc. In the compounds containing carbon. hydrogen and oxygen the oxidation number of carbon can be calculated as
`"Oxidation number of carbon"=(2n_(O)-n_(H))/(n_(C)`
Where, `n_(H), n_(O) and n_(C)` are number of respective atoms
In which of the following compounds, the valency of carbon is two?

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