(a)Illustrate the difference between the following with example: i. Tautomerism and Steric Effect ii. Centre of Symmetry and Axis of Symmetry [4]
(b)Why CICH2COOH and HCOOH are stronger acid than CH3COOH? [5]
(c)Explain how the Resonance effect makes the ortho and para positions of i) Phenol as nucleophilic center and ii) Nitrobenzene as electrophilic center [6]
(9)
Q. 2
(a)How will you synthesize Aldehyde starting from: i) Acid Chloride ii) Phenol iii) Toluene [9]
(b)Discuss the mechanism of following reactions: i) Aldol Condensation ii) Reimer-Tiemann Reaction. [7]
(c)What is the role of Tollen's reagent and Fehling's solution for the oxidation of aldehydes, but not for ketones? [4]
(16)
Q. 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? [6]
(c)Write a brief note on applications of UV/VIS Spectroscopy. [5]
(20)
Q. 4
(a)Starting from Benzene, how will you prepare the following: i) Benzoic acid ii) 2,5-Cyclohexadiene-1-carboxylic acid iii) t-Butyl benzene iv) Benzo trichloride [15]
(b)Discuss orientation in substituted Naphthalene [5]
(20)
Q. 5
(a)Explain any four methods for the resolution of a racemic mixture. [8]
(b)Define the following terms: i) Steroids ii) PCR iii) Epimerization iv) Oligosaccharides v) Composites vi) Vulcanization [12]
(20)
Q. 6
(a)What are Vitamins? How are they classified? Discuss the role of various vitamins in human body. [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]
(20)
Q. 7
(a)How would you classify pigments and what are the characteristics of a good pigment? [6]
(b)Write names and structures of the monomers from which each of the following polymers can be prepared i) Teflon ii) Orlon iii) Nylon 6 iv) Dacron v) Neoprene [5]
(c)Elaborate the following: i) Development of Chromatogram ii) Types of Addition Polymerization iii) Effect of Doping in Semiconductors. [9]
The 2020 PMS Punjab Chemistry paper set by the PPSC. Question wording only; questions marked “Not yet checked” have not been compared with the official paper yet.
Disclaimer Prep Right is independent and not affiliated with PPSC.