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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$$=\displaystyle\frac{2n_O-n_H}{n_C}$$ 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?


A
Carbenes
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B
Allenes
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C
Alkenes
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D
Ketenes
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Solution

The correct option is A Carbenes
By seeing the structures we can say that only carbenes has a valency of two.
707637_665661_ans_5e862d3103434a7096d077ce85721e81.png

Chemistry

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