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Q. In which of the following compounds, carbon exhibits a valency of $4$ but oxidation state $-2$ ?

J & K CETJ & K CET 2011Redox Reactions

Solution:

In $CH _{3} Cl$,
carbon exhibits a valency of $4$ but oxidation state $-2$.
$x+3-1=0$
$x+2=0$
$x=2$