All compounds are organic except
Correct answer: B. NH4CNO
- A. (H₂N)2CO
- B. NH4CNO
- C. CH₂NO₂
- D. CH4
Explanation
The correct answer is ammonium cyanate (NH4CNO), which is not considered an organic compound as it lacks carbon-hydrogen (C-H) bonds, a fundamental characteristic of organic chemistry. In contrast, urea (H₂N)₂CO, CH₂NO₂, and methane (CH4) all contain C-H bonds, thus categorizing them as organic compounds. The absence of C-H bonds in ammonium cyanate distinguishes it as inorganic.
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About Classification of Organic Compounds
Organic compounds are classified by carbon skeleton into open-chain, branched-chain and cyclic compounds, including homocyclic and heterocyclic types. The classification also uses functional groups to distinguish hydrocarbons, halo compounds, alcohols, aldehydes, ketones, carboxylic acids and their derivatives, which is different from naming compounds by IUPAC rules.
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