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Organic Chemistry: Some Basic Principles and Techniques — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryOrganic Chemistry: Some Basic Principles and Techniques5 Marks
Question
  1. What type of intermediate species are formed by homolytic fission?
  2. Which substance is used as adsorbent in thin layer chromatography?
  3. Why is resonance hybrid is more stable than resonating structures?
  4. In Kjeldahl's method, which compound is formed during digestion i.e., reaction of organic compound with conc. $H_2SO_4$ on heating?
  5. Why is HCOOH more acidic than $CH_3COOH$?
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Answer

  1. Free radicals are formed by homolytic fission.
  2. Silica gel is used in thin layer chromatography.
  3. It is because resonance hybrid has lower energy as compared to resonating structures.
  4. $NH_3$ liberated by organic compounds reacts with $H_2SO_4$ to form ammonium sulphate.
  5. It is because $\ \ \ \ \ \ \ {\text{O}}\\\ \ \ \ \ \ \ \ \|\\\text{H}-\text{C}-\text{O}^{\ominus}$ is more stable than $\ \ \ \ \ \ \ \ \ \ \ \ \ \text{O}\\\ \ \ \ \ \ \ \ \ \ \ \ \ \|\\\text{CH}_3-\text{C}-\text{O}^{\ominus}$
group is electron releasing, it will increase negative charge on acetate ion making it unstable.

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