KHYBER PAKHTUNKHWA, PUBLIC SERVICE COMMISSION
COMPETITIVE EXAMINATION FOR THE POSTS OF
PROVINCIAL MANAGEMENT SERVICES (BPS-17) 2022
CHEMISTRY PAPER – II
TIME ALLOWED: 03 HOURS MAX MARKS: 100
Note: Attempt any five questions. All questions carry equal marks.
Q.No. 1 a) Explain geometries of the following molecules on the bases of VBT. (15)
i) ICl2 ii) SbF5-2 iii) [PF6] iv) H2O v) IF7
b) Justify this statement on the basis of Moiecular Orbital Theory, “O2 is a paramagnetic moleculeā.
Q.No.2 a) How will vou differentiate between Order and Molccularity? What are the factors which affect the Reaction Rate Constant? (10)
b) What is meant by the Second Order reaction? Derive the kinetic equation for Second Order reaction. What are the units of k for a second order reaction? (10)
Q.No.3 a) Describe the mechanism of Enzyme Catalysis. What are important featuces of Enzyme Catalysis? (15)
b) How will you comgare physical adsorption and chem’sorption? (05)
Q.No.4 a) What is meant by Conformational Analysis? Discuss the conformational analysis for ethane. (10)
b) Explain the mechanism, kinetics and stereochemistry of Swi and Sn2 reactions with examples. 10)
Q.No. 5 a) What is Aldol condensation? Discuss its mechanism with suitable examples. 10)
b) How are aldehydes synthesized? Discuss various methods for the preparation of aldehydes. (10)
Q.No.6 a) What are Electrophilic Substitution Reactions? Discuss their mechanism with suitable examples. (12)
b) Benzene has a hexagonal planar structure. Justify this statement. (08)
Q.No.7a) What are Amines? How are they classified? Describe five methods for the synthesis of aromatic amines. (12)
b) What are Azo dyes? How are they prepared. Discuss their uses. 08)
Q.No.8a) What are Petrochemicals? Explain their importance. What is the future of Petrochemical industry? (10)
b) What are Vitamins? How are they classified? Discuss their role in human body. (10)
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