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Question

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=2nOnHnC where, nH,nO and nC 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

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