FEDERAL PUBLIC SERVICE COMMISSION

COMPETITIVE EXAMINATION-2018 FOR RECRUITMENT TO POSTS IN BS-17
UNDER THE FEDERAL GOVERNMENT

CHEMISTRY, Paper-2

TIME ALLOWED: THREE HOURS
PART-I(MCQS): MAXIMUM 30 MINUTES
PART-I (MCQS) MAXIMUM MARKS = 20
PART-II MAXIMUM MARKS = 80

NOTE:

• (i) Part-II is to be attempted on the separate Answer Book.
• (ii) Attempt ONLY FOUR questions from PART-II. ALL questions carry EQUAL marks.
• (iii) All the parts (if any) of each Question must be attempted at one place instead of at different places.
• (iv) Candidate must write Q. No. in the Answer Book in accordance with Q. No. in the Q.Paper.
• (v) No Page/Space be left blank between the answers. All the blank pages of Answer Book must be crossed.
• (vi) Extra attempt of any question or any part of the attempted question will not be considered.

PART-II

Q.No. 2.

• (a) Define Resonance and Resonance effect. (10)
• (b) Write Short note on followings. (5+5) (20)
  • (i) Tautomerism
  • (ii) Hyperconjugation.

Q.No. 3. (a) Complete the following reactions. (8×2=16)

Question No 3, Chemistry Paper-2, CSS 2018

• (i) CH3-CH=CH> + KMnO4 H20 > ?
• (ii) CH3-CH=CH, + NiA Pressure
• (ii) CH3-CH=CH2 + dil. H2SO0,————_»> ?
• (iv) CH3-CH=CH, + CH3 — C-H—————->
• (v) CH3-CH=CH2 + Br2 CCly ;
• (vi) CH; —C= CH; + Na/lig N4;>-———>
• (vii) CH=CH+NaNH, ————>
• (viii) CH=CH+H20 H2804 /HgSO.,

(b) 1-Butyne forms a precipitate with an ammonical solution of silver nitrate where 2-Butyne does not. Why? (4) (20)

Q.No. 4. Explain electrophilic substitution reaction mechanism with the help of:

• (i) Nitration
• (ii) Sulphonation. (20)

Q.No. 5.

• (a) Distinguish between: (4×3=12)
  • (i) Configuration and conformation
  • (ii) Enantiomer and Diastreomers
  • (iii) RR. Convention and S. Convention
• (b) Define specific rotation. How do you measure using polarimeter? (8) (20)

Q.No. 6.

• (a) What do you mean by the setting of cement. (10)
• (b) Discuss future of cement industry in Pakistan. (10) (20)

Q.No. 7.

• (a) Explain Aldol condensation reaction with examples. (10)
• (b) What are proteins? (5)
• (c) Explain Bio synthesis of cholesterol. (5)

Q.No. 8. Explain the following: (4 marks each) (20)

• (a) Beers Lamberts Law. (b) Wood Wards Fieser Rule
• (c) Hooks Law (d) Basic principle of NMR?
• (e) Chemical Shift.

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