In which of the following compounds the oxidation number of carbon is not zero? (a) \( \mathrm{H...

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In which of the following compounds the oxidation number of carbon is not zero?
(a) \( \mathrm{HCHO} \)
(b) \( \mathrm{CH}_{3} \mathrm{COOH} \)
(c) \( \mathrm{C}_{12} \mathrm{H}_{22} \mathrm{O}_{11} \)
(d) \( \mathrm{CH}_{3} \mathrm{CHO} \)
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