PUNJAB PUBLIC SERVICE COMMISSION
COMBINED COMPETITIVE EXAMINATION FOR
RECRUITMENT TO THE POSTS OF
PROVINCIAL MANAGEMENT SERVICE, ETC. – 2015
SUBJECT: CHEMISTRY (PAPER-II)
TIME ALLOWED: THREE HOURS
MAXIMUM MARKS: 100
Q.1. a). Explain the term “ Inductive effect” and discuss its role in the reactivity of organic compounds.
b). Explain
(i).Why a molecule having plane symmetry does not show optical activity ?
(ii).What is Huckel Rule for Aromaticity?
(iii).Why phenol show acidic behavior ?
(iv).What is importance of finger print region in IR-Spectrum?
(v).What is Oppenauer oxidation?
Q.2. a). Discuss acid and base catalyzed aldol condensation reaction of carbonyl compounds? What is its synthetic application?
b). Explain with examples:
(i).Resonance effect
(ii).Orientation in substituted naphthalene.
Q.3. a). What is conformational isomerism? Discuss conformational analysis of cyclohexane.
b). Discuss any four methods of resolution of a racemic mixture.
Q.4. a). Discuss different types of molecular transitions which are brought about by absorption of
(i).Ulteraviolet Radiation
(ii).Infra-red Radiation
b).Define following terms:
(i). Bathochromic Shift
(ii). Hypochromic Shift
(iii). Lamberts Law of Absorption
(iv). Overtones
(v). Fermi Resonance
Q.5. a). What is thin layer chromatography? Why it is advisable to aplly TLC to a mixture before Proceeding for Column chromatography?
b). Explain the following terms:
(i). Gradient elution
(ii). Retention Factor
(iii). Adsorption and partition chromatography
(iv). Condensation polymerization
(v). Mordanting in dying process
Q.6. a). What are liquid crystals? Discuss their types and applications.
b). Define detergents. Discuss their chemical classification and major applications.
Q.7. a). What are semi-conductors ? discuss role of doping in the preparation of n-type and p-type semi-conductors.
b). What are liquids ? Discuss their classification and role in living organism.