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FPSC · CSS 2019

Chemistry, Paper II

80 marks · 3 hours · 6 questions
This paper Chemistry · all yearsQ. 2 · Elaborate the optical isomerism with…Q. 3 · Prepare a plausible synthesis for…Q. 4 · Describe the necessary conditions and…Q. 5 · Outline stepwise reaction mechanism for…Q. 7 · An unknown substance shows a…Q. 8 · Elucidate the various steps involved…With this paper← 20192020 →
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PART–II

Q. 2
  1. (a)Elaborate the optical isomerism with appropriate examples. [10]
  2. (b)Express the resolution and its applications. [5]
  3. (c)Explain the geometric isomerism in cyclic compounds. [5]
(20)
Q. 3
  1. (a)Prepare a plausible synthesis for each of the following transformation: A. B. C. D. E. F. [12]
  2. (b)Explain the type of hybridization in 1,3-Butadiene. [4]
  3. (c)Mention any three methods for preparation of Alkynes. [4]
(20)
Q. 4
  1. (a)Describe the necessary conditions and reagents required to convert benzene into the following. Nitrobenzene, Ethyl benzene, cyclohexane, Benz-aldehyde, Benzoic acid, and Chlorobenzene. [8]
  2. (b)Draw all possible structures of aromatic compounds with the formula C9H12 containing the benzene ring. [6]
  3. (c)How do you account for the fact that phenol is more easily attacked by electrophiles than nitrobenzene? [6]
(20)
Q. 5
  1. (a)Outline stepwise reaction mechanism for the following reactions: SN1 reaction between bromoethane and NaOH. SN2 reaction between 2-chloro-2-methyl propane and NaCN. [8]
  2. (b)Discuss the various factors, nature of substrate, solvent, catalyst, and the leaving group in SN2 reaction. [8]
  3. (c)How does methyl iodide react with the following reagents? Acetic acid, Mg, Alcoholic KOH and Na. [4]
(20)
Q. 7
  1. (a)An unknown substance shows a molecular ion peak at m/z=170 with a relative intensity of 100.The M+1 peak has relative intensity of 13.2 and the M+2 peak has an intensity of 1.00. What is the molecular formula for this substance? [10]
  2. (b)Mention the various tools to interpret the mass spectra. [5]
  3. (c)What is the nitrogen rule? Explain it with suitable examples. [5]
(20)
Q. 8
  1. (a)Elucidate the various steps involved in Glycolysis. [12]
  2. (b)Express the role of ATP in Glycolysis. [4]
  3. (c)Describe the pathway that leads to the formation of Lactic acid. [4]
(20)

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The 2019 CSS Chemistry paper set by the FPSC. Question wording only; questions marked “Not yet checked” have not been compared with the official paper yet.

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