UPSC NDA II 2023 General Ability Solved Paper

Concept:An organic compound typically contains carbon-hydrogen (C-H) bonds, while inorganic compounds may contain carbon but lack C-H bonds.Explanation:Ammonium cyanate ($\mathrm{NH}_{4}\mathrm{OCN}$) contains carbon bonded to oxygen and nitrogen, but does not have any C-H bonds. Therefore, it is considered inorganic.Marsh gas is methane ($\mathrm{CH}_{4}$), a hydrocarbon with C-H bonds, making it organic.Urea ($\mathrm{CO}(\mathrm{NH}_{2})_{2}$) contains carbon, oxygen, and nitrogen, and has N-H bonds, but its carbon is not bonded to hydrogen. However, urea is historically classified as organic because it was first synthesized from inorganic sources, but by the strict modern definition, organic compounds require C-H bonds. Note: In many exam contexts, urea is accepted as organic due to its biological origin. However, the question asks "NOT an example" and ammonium cyanate is the correct answer as it is inorganic by both classical and modern standards.Cane sugar (sucrose, $\mathrm{C}_{12}\mathrm{H}_{22}\mathrm{O}_{11}$) contains many C-H bonds and is clearly organic.Thus, the compound that does not qualify as organic is ammonium cyanate.Answer:Ammonium cyanate