COMBINED COMPETITIVE EXAMINATION
FOR RECRUITMENT TO THE POSTS OF
PROVINCIAL MANAGEMENT SERVICE -2020
SUBJECT: CHEMISTRY (PAPER-II)
TIME ALLOWED: THREE HOURS MAXIMUM MARKS: 100
NOTE:
i. All the parts (if any) of each Question must be attempted at one place instead of at different places.
ii. Write Q. No. in the Answer Book in accordance with Q. No. in the Q. Paper.
iii. No Page/Space be left blank between the answers. All the blank pages of Answer Book must be crossed.
iv. Extra attempt of any question or any part of the question will not be considered.
Attempt FIVE Questions in all. Attempt in Urdu or English.
Q.No.1 (a) Illustrate the difference between the following with example: (4+5=9)
i. Tautomerism and Steric Effect
ii. Centre of Symmetry and Axis of Symmetry
(b) Why ClCH₂COOH and HCOOH are stronger acid than CH₃COOH? (5)
(c) Explain how the Resonance effect makes the ortho and para positions of (3+3=6)
i) Phenol as nucleophilic center and
ii) Nitrobenzene as electrophilic center
Q No.2: (a) How will you synthesize Aldehyde starting from: (3×3=9)
i) Acid Chloride ii) Phenol iii) Toluene
(b) Discuss the mechanism of following reactions: (4+3=7)
i) Aldol Condensation ii) Reimer-Tiemann Reaction.
(c) What is the role of Tollen’s reagent and Fehling’s solution for the oxidation of aldehydes, but not for ketones? (4)
Q No.3: (a) Describe the main components and their role in a simple double beam IR Spectrophotometer. (9)
(b) Elaborate the principle of Raman Spectroscopy and how this spectroscopy is more advantageous over IR Spectroscopy? (4+2=6)
(c) Write a brief note on applications of UV/Vis Spectroscopy. (5)
Q No.4: (a) Starting from Benzene, how will you prepare the following: (3+4+4+4=15)
i) Benzoic acid ii) 2,5-Cyclohexadiene-1-carboxylic acid
iii) t-Butyl benzene iv) Benzo trichloride
(b) Discuss orientation in substituted Naphthalene (5)
Q No.5: (a) Explain any four methods for the resolution of a racemic mixture. (8)
(b) Define the following terms: (6×2=12)
i) Steroids ii) PCR iii) Epimerization
iv) Oligosaccharides v) Composites vi) Vulcanization
Q No.6: (a) What are Vitamins? How are they classified? Discuss the role of various vitamins in human body. (2+2+5=9)
(b) State applications of Column chromatography (3)
(c) What are the differences between Dyes and Pigments? (3)
(d) Discuss why Dyes are colored compounds? (5)
FOR RECRUITMENT TO THE POSTS OF
PROVINCIAL MANAGEMENT SERVICE -2020
SUBJECT: CHEMISTRY (PAPER-II)
TIME ALLOWED: THREE HOURS MAXIMUM MARKS: 100
NOTE:
i. All the parts (if any) of each Question must be attempted at one place instead of at different places.
ii. Write Q. No. in the Answer Book in accordance with Q. No. in the Q. Paper.
iii. No Page/Space be left blank between the answers. All the blank pages of Answer Book must be crossed.
iv. Extra attempt of any question or any part of the question will not be considered.
Attempt FIVE Questions in all. Attempt in Urdu or English.
Q.No.1 (a) Illustrate the difference between the following with example: (4+5=9)
i. Tautomerism and Steric Effect
ii. Centre of Symmetry and Axis of Symmetry
(b) Why ClCH₂COOH and HCOOH are stronger acid than CH₃COOH? (5)
(c) Explain how the Resonance effect makes the ortho and para positions of (3+3=6)
i) Phenol as nucleophilic center and
ii) Nitrobenzene as electrophilic center
Q No.2: (a) How will you synthesize Aldehyde starting from: (3×3=9)
i) Acid Chloride ii) Phenol iii) Toluene
(b) Discuss the mechanism of following reactions: (4+3=7)
i) Aldol Condensation ii) Reimer-Tiemann Reaction.
(c) What is the role of Tollen’s reagent and Fehling’s solution for the oxidation of aldehydes, but not for ketones? (4)
Q No.3: (a) Describe the main components and their role in a simple double beam IR Spectrophotometer. (9)
(b) Elaborate the principle of Raman Spectroscopy and how this spectroscopy is more advantageous over IR Spectroscopy? (4+2=6)
(c) Write a brief note on applications of UV/Vis Spectroscopy. (5)
Q No.4: (a) Starting from Benzene, how will you prepare the following: (3+4+4+4=15)
i) Benzoic acid ii) 2,5-Cyclohexadiene-1-carboxylic acid
iii) t-Butyl benzene iv) Benzo trichloride
(b) Discuss orientation in substituted Naphthalene (5)
Q No.5: (a) Explain any four methods for the resolution of a racemic mixture. (8)
(b) Define the following terms: (6×2=12)
i) Steroids ii) PCR iii) Epimerization
iv) Oligosaccharides v) Composites vi) Vulcanization
Q No.6: (a) What are Vitamins? How are they classified? Discuss the role of various vitamins in human body. (2+2+5=9)
(b) State applications of Column chromatography (3)
(c) What are the differences between Dyes and Pigments? (3)
(d) Discuss why Dyes are colored compounds? (5)
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