PUNJAB PUBLIC SERVICE COMMISSION
COMBINED COMPETITIVE EXAMINATION
FOR RECRUITMENT TO THE POSTS OF PROVINCIAL MANAGEMENT SERVICE-2021
CASE NO. 3C2022
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.
NOTE: Attempt any FIVE Questions in all. Attempt in Urdu or English.
Q.No.1 A. What is the necessary conditions for the absorption of IR radiation by the compounds? Which of the following molecules do not absorb in the IR region and why? (15 Marks)
(i) H2 (ii) HCl (iii) ICl (iv) N2 (v) H2O
B. Discuss the applications of Ultraviolet/Visible spectroscopy. (5 Marks)
Q.No.2 A. Discuss the effect of Hydrogen bonding on the boiling points and water solubility of organic compounds. (8 Marks)
B. What is essential difference between: (12 Marks)
(i) Inductive effect and Mesomeric effect
(ii) Resonance and Tautomerism
(iii) Conjugation and Hyperconjugation
Q.No.3 A. Describe the general mechanism by which benzene undergoes substitution reaction. (5 Marks)
B. Show the product formed (if any), by action of each of the following on benzene. (15 Marks)
(i) Conc. HCl (ii) Bromine Water (iii) Con. NaOH
(iv) Bromine water (v) Fuming H2SO4
Q.No.4 A. Write the structure of the following compounds. (10 Marks)
(i) 2-methylcyclobutanol (ii) t-amylalcohol (iii) o-nitrophenol
(iv) 2-iso-propyl-6-methylphenol (v) neo pentyl alcohol
B. Define and explain the following reactions: (10 Marks)
(i) Haloform reactions (ii) Canizzaro reactions
Q.No.5 A. What is optical isomerism? Discuss necessary conditions for it. How it can be determined? (10 Marks)
B. Write the resonance structure of: (10 Marks)
(i) Benzene (ii) Anthracene (iii) Naphthalene (iv) Phenanthrene
Q.No.6 A. Discuss the digestion, absorption and transport of proteins. (12 Marks)
B. Discuss structure and biological significance of nucleic acids. (8 Marks)
Q.No.7 A. What is Chromatography? How Column chromatography is used as an analytical technique? (10 Marks)
B. What is polymerization? Discuss and compare condensation polymerization with addition polymerization. (10 Marks)
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