CHE-GE-1(H)(R/B)NC Past Paper Dec 2023 PDF

+3 Sem-I CHE-GE-1(H)(R/B)NC Dec,2023 Atomic structure, Bonding, General Organic Chemistry &...

+3 Sem-I CHE-GE-1(H)(R/B)NC Dec,2023 Atomic structure, Bonding, General Organic Chemistry & Aliphatic Hydrocarbons Full Marks : 60 Time : 3 hrs Figures in the right hand margin indicate marks PART-I 1.Answer all questions or fill in blanks as required. [8x1] a. Which orbital out of 3d, 4S and 5S has highest energy? b. Which quantum number helps to determine the shape of an orbital? c. According to Bohr’s theory, the angular momentum of the electron in the 4 th orbitis: ℎ ℎ ℎ i) 16 ii) 4 iii) 2 iv) None of these d. The shape of CO2 molecule is _____ ? e. The electron deficient species are called as ___ ? f. The shape of Carbanion ion is ____ ? g. The general formula of alkyne is _______ ? h. Alkaline KMnO4 Solution is called as ______ ? PART-II 2. Answer any Eight of the following questions [8x1.5] a.Write the values of n, l and m for the 4S electron. b. State Pauli’s exclusion principle. c. Write the electronic configuration of O2 molecule on the basis of MOT. d. Define – Lattice energy. e. What do you mean by Chiral Carbon atom ? Give an example. f. Assign R/S notation to the following Fischer formula: g. How do acetylene be prepared from Calcium Carbide ? h. Complete the following: CH3-CH==CH2 + HBr ⎯⎯⎯⎯⎯ ? i.What happens when ethylene is treated with alkaline KMnO4 solution ? j. What is Huckel’s rule ? 1  PART-III 3. Answer any Eight of the following questions [8x2] a. Discuss Heisenberg’s uncertainty principle. b. Write the significance of 𝜑 and 𝜑 ? c. Derive De-Broglie equation. d. Explain about polarizing power and polarizability.. e. NH3 molecule has pyramidal shape – Explain. f. Compare the basic nature between ethyl amine and aniline with reason. g. What are nucleophiles ? Give an example. h. State Markownikoff’s rule with an example. i. What is Birch reduction? j. What happens when ethylene undergo Ozonolysis ? PART-IV 4. Give a brief account of different quantum numbers. OR Write notes on: [3+3] i) de-Broglie’s principle ii) Hund’s rule of maximum multiplicity 5. Explain Fajan’s rule with examples. Covalent character in ionic compounds depends upon the polarizing power and polarizability-Discuss OR Explain VSEPR theory and discuss the shape of H2O molecule with the help of this theory. [3+3] 𝟏 𝟏 6. What are Carbocations? Discuss the structure and stability of Carbocation intermediates. [1+2 +2 ] 𝟐 𝟐 OR Write notes on; i) Electromeric effect ii) Homolysis and Heterolysis [3 +3 7. a) Write the general method of preparation of alkynes by: i) dehalogenation of tetra halides ii) dehydrohalogenation of vicinal-dihalides. b) How does propyne react with alkaline KMnO4 ? OR a) State and explain Saytzeff’s rule. b) Complete the followingreactions: 𝟏 i) CH3-CH==CH2 ⁄ ? [1 ] 𝟐 𝟏 ii) CH3-CH2-Cl + KOH (Alc) → ? [1 ] 𝟐 ***** 2