The sum of oxidation number of the carbon atoms in CH3 CHO
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Explanation:
O is -2, unless it is peroxide = -1
H is +1 unless bonded to a metal as metalic hydride = -1
C is more electronegative than H, so C is negative and H is positive.
The 1st C has 3 H’s = +3, so C = -3
The bond between the 2 H’s doesn’t affect the oxidation number.
O is more electronegative than C, so O is negative and C is positive.
The 2nd C has 1H = +1 and 1 O = -2, so the 2nd C = +1
The total must equal 0
(+3 + -3) + (+1 + -2 + +1) = 0
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