BCHCT-131 EM 2026 SOLVED ASSIGNMENT

Description

Bachelor’s Degree Programme (BSCG/BSCM)
BCHCT-131: ATOMIC STRUCTURE, BONDING, GENERAL ORGANIC CHEMISTRY
AND ALIPHATIC HYDROCARBONS
Valid from 1st January, 2026 to 31st December, 2026

Note: Attempt all questions. The marks for each question are indicated against it.

PART-(A) (50)

1.Explain Geiger and Marsden’sa-particle experiment using a suitable diagram.

2.(a) Name different lines exhibited in the atomic spectrum of hydrogen.

(b) Write the de-Brogile relationship for dual nature of matter. Also define matter waves.

3.Briefly discuss photoelectric effect. Also give the explanation of this effect given by Einstein. (5)

4.(a) List the applications of Schrodinger equation. (3)

(b) Explain the significance of y and y2

5.What are four quantum numbers? Give their significance. (5)

6.(a) Explain the stability of half-filled and completely filled orbitals giving suitable examples.

 (b) Give any two examples of atoms showing anomalous electronic configurations. (2)

7.State and illustrate Fajan’s rules giving suitable examples. (5)

8.(a) What is electronegativity? Arrange the following in the decreasing order of their electronegativities: K, F and I. (3)

(b) Compare the characteristics of ionic and covalent compounds. (2)

9.(a) Write the resonance structures of dimethylsulphone. (2)

(b) Give the type of hybridisation in the following molecules: (i) BrF₅ (ii) XeF₂ (iii) [Ni(CN)₄]^2-

10.(a) Draw p_y-p_ycombination of atomic orbitals to give the suitable molecular orbitals. (3)

 (b) Calculate the bond order of F2 molecule from its molecular orbital configuration. (2)

PART-(B

)11. (a) Assign the E or Z configuration to the following molecule giving the steps involved: Also assign the priorities to the different groups. (3)

(b) How will you distinguish maleic acid and fumaric acid? (2)

12.(a) Assign R/S configuration to the following compound: Also give the steps involved.

(b) Give example of a meso compound. Also comment on its optical activity giving reason.

13.Draw the energy profile for various confirmations exhibited by cyclohexane. Also explain the relative energies of various conformations.

14.Explain the relative stability of the following carbocations:

 (i) methyl carbocation (ii) a tertiary carbocation (iii) a primary carbocation (iv) a secondary carbocation

15.(a) Differentiate between the basicity and nucleophilicity giving suitable examples. (5)

 (b) Briefly explain the mechanism of β-elimination.

16.(a) Briefly explain Kolbe’s electrolytic method for the synthesis of alkanes.

 (b) What is aromatisation of gasoline? Illustrate giving appropriate reactions.

17.(a) State and explain Saytzeff rule giving a suitable example.

18.(b) Explain retro Diels-Alder reaction giving a suitable example.

19.(a) (i) State Markowinkoff’s Rule. (ii) What is peroxide effect? Explain.

(b) Write the reactions for the hydroboration of propene followed by the oxidation by alkaline H₂O₂.

20.(a) How will you prepare 3-octyne from 1-hexyne? Write the steps involved. (2)

 (b) Write the products of oxidation of 2-hexyne using alkaline KMnO4.