(a)Discuss 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? (i) H₂ (ii) HCl (iii) ICl (iv) N₂ (v) H₂O [15]
(b)Discuss the applications of Ultraviolet/Visible spectroscopy. [5]
(20)
Q. 2
(a)Discuss the effect of Hydrogen bonding on the boiling points and water solubility of organic compounds. [8]
(b)What is essential difference between: (i) Inductive effect and Mesomeric effect (ii) Resonance and Tautomerism (iii) Conjugation and Hyperconjugation [12]
(20)
Q. 3
(a)Describe the general mechanism by which benzene undergoes substitution reaction. [5]
(b)Show the product formed (if any), by action of each of the following on benzene. (i) Conc. HCI (ii) Bromine Water (iii) Con. NaOH (iv) Bromine water (v) Fuming HzSO+ [15]
(20)
Q. 4
(a)Write the structure of the following compounds. (i) 2-methylecyclobutanol (ii) t-amylalcohol (iii) o-nitrophenol (iv) 2-iso-propyl-6-methylphenol (v) neo pentyl alcohol [10]
(b)Define and explain the following reactions: (i) Haloform reactions (ii) Canizzaro reactions [10]
(20)
Q. 5
(a)What is optical isomerism? Discuss necessary conditions for it. How it can be determined? [10]
(b)Write the resonance structure of: (i) Benzene (ii) Anthracene (iii) Naphthalene (iv) Phenanthrene [10]
(20)
Q. 6
(a)Discuss the digestion, absorption and transport of proteins. [12]
(b)Discuss structure and biological significance of nucleic acids. [8]
(20)
Q. 7
(a)What is Chromatography? How Column chromatography is used as an analytical technique? [10]
(b)What is polymerization? Discuss and compare condensation polymerization with addition polymerization. [10]
The 2021 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.
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