PUNJAB PUBLIC SERVICE COMMISSION
COMBINED COMPETITIVE EXAMINATION
FOR RECRUITMENT TO THE POSTS OF
PROVINCIAL MANAGEMENT SERVICE, ETC-2022
CASE NO. 2C2023
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) Differentiate between (1) Conjugation and hyper conjugation
(2) Covalent bond and hydrogen bond (3) Localized and delocalized bond
(4)Resonance effect and Inductive effect (5) Inter and Intra molecular hydrogen bonding. (10 Marks)
b) Compare the basicity of (1) aniline and amine,(2) Primary, secondary ,and ter.alcohol and acidity of (1)phenol and alcohol (2) Flourochloro ,and bromo acetic acid (3) 1-chloro,2-chloro and 3-chloro butanoic acid (10 Marks)
Q.No.2 a) Write short notes on the following:
(i) Finger print region (ii) Chromophores
b) Discuss the principle of IR spectroscopy. How will you distinguish between following pairs of compounds on the basis of IR spectroscopy:
(i) Ethyle alcohol and diethyl ether (ii) Accetic Acid and Ethyle acetate
(8+12=20 Marks)
Q.No.3 a) How will you prepare the following compounds starting from alcohol?
(1) Pentanal (2) 2-Butanone (3) 3-pentanone (4) Cyclohexanone (5) Benzyl isopropyl ketone
(6) 2,2 dimethyl 2-pentanone
b) Write the expected products of aldol condensation between
(1) Acetaldehyde and formaldehyde (2) Acetaldehyde and acetone
(12+8=20 Marks)
Q.No.4 a) How aromatic compounds are being prepared by following methods:
(i) Wurtz-Fitting method (ii) Friedel- Crafts reactions
b) Discuss the following electrophilic reactions of Benzene:
(i) Halogenation (ii) Nitration and (iii) sulphonation
(10+10=20 Marks)
Q.No.5 a) What are Lipids? How you can classify them. Discuss their importance.
b) What are Proteins? Discuss the structure and general properties of proteins.
(10+10=20 Marks)
Q.No.6 a) Explain the difference between: (1)Stationary phase and mobile phase(2)Retention time and retention volume (3) Adsorption and partition chromatography(4) Liquid liquid chromatography and liquid solid chromatography.
b) How the Thin layer chromatography is performed? (16+4=20 Marks)
Q.No.7 a) What are semi -conductors? How they can be classified?
b) What is PET? Discuss its manufacturing and applications.
(10+10=20 Marks)
Q.No.8 a) Discuss Inorganic Pigments in detail.
b) Define Detergents. Discuss the classification of Detergents.
(8+12=20 Marks)
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