State the oxidation number of carbonyl carbon in methanal and methanoic acid respectively:
A
0 and 0
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B
0 and +2
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C
+1 and +2
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D
+1 and +3
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Solution
The correct option is B0 and +2 Let the oxidation number of carbonyl carbon in methanal (HCHO) and methanoic acid (HCOOH) is x and y .respectively In HCHO, 2(+1)+x+(−2)=0 2+x−2=0 x=0 In HCOOH 2(+1)+y+2(−2)=0 y=2