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FPSC · CSS 2012

Chemistry, Paper II

100 marks · 3 hours · 7 questions
This paper Chemistry · all yearsQ. 2 · What is the difference between…Q. 3 · Discuss the rate law of…Q. 4 · Describe the differences between physical…Q. 5 · Discuss stereoisomerism in compounds having…Q. 6 · Discuss the structure of Grignard…Q. 7 · How would you prepare the…Q. 8 · Write main steps in the…With this paper← 20122013 →
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Part II

Q. 2
  1. (a)What is the difference between Valance Bond Theory and Molecular Orbital Theory? [8]
  2. (b)Draw the molecular orbital diagram of CO molecule showing sigma pi bonding, nonbonding and anti bonding molecular orbitals. [8]
  3. (c)Discuss the difference between the hybridization of SO 2_2 and SO 3_3 [4]
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(20)
Q. 3
  1. (a)Discuss the rate law of SN 1_1 mechanism. [6]
  2. (b)What is the importance of half life in the determination of order of reactions? [6]
  3. (c)What is pseudo first order reaction? & What is its importance? [8]
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(20)
Q. 4
  1. (a)Describe the differences between physical adsorption and chemiadsorption. [8]
  2. (b)The data of Langmuir for the adsorption of Nitrogen on mica at 90 K given: P(atm) 2.8 3.4 4.0 4.9 6.0 7.3 9.4 12.8 17.9 23.5 Amt adsorbed cumm 12.0 13.4 15.1 17.9 19.0 21.6 23.9 25.5 28.2 30.8 Estimate the surface area of the mica sample in the Langmuir experiment at 20°C & 760mm? [8]
  3. (c)Define Homogenous catalyst & Hetrogenous catalyst. [4]
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Q. 5
  1. (a)Discuss stereoisomerism in compounds having 2 similar asymmetric carbon atoms. [6]
  2. (b)Draw Fisher projection formulae for the following compounds: R & S 2-Bromopentane R & S 3-chloro-1-pentane R & S 3-chloro-3Methyloctane R & S 2-pentanol [8]
  3. (c)What do you understand by the terms Z & E isomers? Illustrate your answer with example. [6]
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Q. 6
  1. (a)Discuss the structure of Grignard reagent. [4]
  2. (b)How these compounds can be prepared by Grignard reagent? Ethane Acetic acid 2-Butanol [12]
  3. (c)What is diazotisation reaction? [4]
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Q. 7

How would you prepare the following compounds from benzene? Name each reaction as well: (i) Acetophenone (ii) Bromobenzene (iii) Maleic anhydride (iv) Toluene (v) Benzaldehyde

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Q. 8
  1. (a)Write main steps in the formation of following polymers: Nylon 6,6 and polyester by condensation polymerization. Polyethlene by Free Radical Polymerization. [6]
  2. (b)Differentiate between oil, fat & wax with examples. [9]
  3. (c)What are alkaloids? [5]
(20)

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The 2012 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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