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FPSC · CSS 2026

Chemistry, Paper II

100 marks · 3 hours · 7 questions · official PDF, 2 pages
Practice 20 MCQs
This paper Chemistry · all yearsQ. 2 · How the Resonance Effect plays…Q. 3 · Outline the following reactions of…Q. 4 · How primary, secondary and tertiary…Q. 5 · Discuss various classes of compounds…Q. 6 · Elucidate a structure that is…Q. 7 · Discuss the chemistry of fatty…Q. 8 · Draw a flow-sheet diagram and…With this paperPart-I MCQs20Official PDF2 pp← 2026
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Part II

Q. 2
  1. (a)How the Resonance Effect plays a significant role to conclude the basic and acidic strengths of molecules. Discuss with relevant examples. [12]
  2. (b)How the Hyperconjugation alters the properties of molecules? Discuss. [8]
(20)
Q. 3
  1. (a)Outline the following reactions of alkenes with suitable examples. [16]
  2. (b)Although the halogens are deactivator for electrophilic aromatic substitution but still they are ortho and para directors. Explain. [4]
(20)
Q. 4
  1. (a)How primary, secondary and tertiary amines can be differentiated by the Hinsberg's method? [9]
  2. (b)Ethanol is the only primary alcohol which gives a positive iodoform test. Outline the mechanism of this reaction. [6]
  3. (c)Phenol is converted to salicylaldehyde by the famous Reimer-Tiemann reaction. Draw the mechanism of this reaction. [5]
(20)
Q. 5
  1. (a)Discuss various classes of compounds which do not have any chiral carbon atoms but still they show chirality. [9]
  2. (b)Why 1,2- and 1,3-methylcyclohexanecarboxylic acid are optically active but 1,4-methylcyclohexanecarboxylic acid is not? Elaborate. [5]
  3. (c)Allocate the priority to various groups with the help of sequence rules and then assign R or S configuration (whichever is applicable) to the following molecules. [6]
(20)
Q. 6
  1. (a)Elucidate a structure that is consistent with each set of 1H-NMR data. i) C₁₁H₁₂O₄: δ 10.1 (1H, br s), 7.75 (1H, d, J = 16 Hz), 7.13 (1H, dd, J = 2.1, 8.1 Hz), 7.08 (1H, d, J = 2.1 Hz), 6.89 (1H, d, J = 8.1 Hz), 6.36 (1H, d, J = 16 Hz), 3.92 (3H, s) and 3.87 (3H, s). ii) C₁₀H₁₀O₅: δ 7.71 (1H, d, J = 16 Hz), 6.76 (2H, s), 6.38 (1H, d, J = 16 Hz), and 3.78 (3H, s). [10]
  2. (b)Sketch out the mass fragmentation pattern in CH3CH2COCH2CH2CH3 molecule. [6]
  3. (c)How can you distinguish between following pairs of compounds with the help of IR spectroscopy? PhCONH2 and PhCH2NH2 [4]
(20)
Q. 7
  1. (a)Discuss the chemistry of fatty acids and glyceryl trialkanoates in detail. [10]
  2. (b)How the numbering in steroids is carried out? Discuss the reactions and biological functions of cholesterol. [10]
(20)
Q. 8
  1. (a)Draw a flow-sheet diagram and elaborate the manufacturing and processing of paper in the paper industry. [16]
  2. (b)Elaborate why the fertilizers are necessary for proper plant growth. [4]
(20)

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About this paper

The 2026 CSS Chemistry paper set by the Federal Public Service Commission. Question wording only; questions marked “Not yet checked” have not been compared with the official paper yet. Open the official paper beside the questions to check any of them.

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