Skip to content
MockCSS
All Chemistry Paper II papers

CSS past paper

CSS Chemistry Paper II Past Paper 2018

CSS Chemistry Paper II 2018 carries 100 marks over 3 hours. It has 7 questions.

Marks
100
Time
3 hours
Questions
7

Years

How to attempt: Attempt ONLY FOUR questions from PART-II. ALL questions carry EQUAL marks.

Questions

Question 1 (Part I) is the paper's MCQs, which are not reproduced here.

  1. Q. 2
    (20)
    • (a)
      Define Resonance and Resonance effect.
      (10)
    • (b)
      Write Short note on followings. (5+5)
      • (i)
        Tautomerism
      • (ii)
        Hyperconjugation.
  2. Q. 3
    (20)
    • (a)
      Complete the following reactions. (8×2=16)
      • (i)
        CHX3−CH=CHX2+KMnOX4→HX2O?\ce{CH3-CH=CH2 + KMnO4 ->[H2O] ?}
      • (ii)
        CHX3−CH=CHX2+→PressureNi Δ\ce{CH3-CH=CH2 + ->[Ni $\Delta$][Pressure]}
      • (iii)
        CHX3−CH=CHX2+\ce{CH3-CH=CH2 +} dil. HX2SOX4→\ce{H2SO4 ->}
      • (iv)
        CHX3−CH=CHX2+CHX3−C(=O)−H→\ce{CH3-CH=CH2 + CH3-C(=O)-H ->}
      • (v)
        CHX3−CH=CHX2+BrX2→CClX4\ce{CH3-CH=CH2 + Br2 ->[CCl4]}
      • (vi)
        CHX3−C≡CH+Na\ce{CH3-C#CH + Na} / liq NHX3→\ce{NH3 ->}
      • (vii)
        CH≡CH+NaNHX2→\ce{CH#CH + NaNH2 ->}
      • (viii)
        CH≡CH+HX2O→HX2SOX4 / HgSOX4\ce{CH#CH + H2O ->[H2SO4 / HgSO4]}
    • (b)
      1-Butyne forms a precipitate with an ammonical solution of silver nitrate where 2-Butyne does not. Why?
      (4)
  3. Q. 4
    Explain electrophilic substitution reaction mechanism with the help of:
    (20)
    • (i)
      Nitration
    • (ii)
      Sulphonation.
  4. Q. 5
    (20)
    • (a)
      Distinguish between: (4×3=12)
      • (i)
        Configuration and conformation
      • (ii)
        Enantiomer and Diastreomers
      • (iii)
        R. Convention and S. Convention
    • (b)
      Define specific rotation. How do you measure using polarimeter?
      (8)
  5. Q. 6
    (20)
    • (a)
      What do you mean by the setting of cement.
      (10)
    • (b)
      Discuss future of cement industry in Pakistan.
      (10)
  6. Q. 7
    • (a)
      Explain Aldol condensation reaction with examples.
      (10)
    • (b)
      What are proteins?
      (5)
    • (c)
      Explain Bio synthesis of cholesterol.
      (5)
  7. Q. 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.
  1. Part-II is to be attempted on the separate Answer Book.
  2. Attempt ONLY FOUR questions from PART-II. ALL questions carry EQUAL marks.
  3. All the parts (if any) of each Question must be attempted at one place instead of at different places.
  4. Candidate must write Q. No. in the Answer Book in accordance with Q. No. in the Q.Paper.
  5. No Page/Space be left blank between the answers. All the blank pages of Answer Book must be crossed.
  6. Extra attempt of any question or any part of the attempted question will not be considered.