BCHCT-133 EM 2024 SOLVED ASSIGNMENT

Description

ASSIGNMENT
CHEMICAL ENERGETICS, EQUILIBRIA AND FUNCTIONAL ORGANIC
CHEMISTRY I

Core Course in Chemistry
Course Code: BCHCT-133
Maximum Marks: 100
Note: Attempt all questions. The marks for each question are indicated against it.
1. a) Define and explain a thermodynamically reversible process. (5)
b) 0.25 mol of an ideal monoatomic gas undergoes isothermal expansion from a
volume of 2.0 dm3
to 10 dm3
at 27 oC. Calculate the maximum work that can be
obtained from this process. (5)
2. a) Define standard enthalpy of formation and describe a method for its direct
determination with the help of an example. (5)
b) Differentiate between enthalpy driven and entropy driven reactions with the help of
suitable examples. (5)
3. a) Give the statements of Zeroth, First, Second and the Third laws of thermodynamics
and outline their significance. (5)
b) What is reaction quotient and how is it helpful in determining the direction of a
given reaction? (5)
4. a) In the following equilibrium, predict the direction of shift of equilibrium for each
N2
(g) + 3H2
(g) 2NH3
(g) + 92 kJ
i) Addition of H2
ii) increased pressure
iii) lowering of temperature.
b) Define degree of ionisation of a weak electrolyte and discuss the factors affecting
it. (5)
5. a) Explain the effect of common ions on the ionisation equilibria of weak acids with
the help of a suitable example. (5)
b) Define solubility product constant and derive the relationships between solubility
and solubility product constants for salts of AB2, A2B types. (5)
6 a) List various methods of preparation of benzene and also write one chemical
reaction for each case.
(5)
Assignment Code: BCHCT-133/TMA/2024
condition listed below: (5)
PART A: CHEMICAL ENERGETICS AND EQUILIBRIA (50)
PART B: FUNCTIONAL GROUP ORGANIC CHEMISTRY-I (50)
4

b) Write the mechanism of Friedel-Craft’s alkylation. What are its limitations? (5)
7. a) Explain why Nitro group is meta-directing deactivator? (5)
b) Which one of the following would undergo faster SN2 reaction? Explain
CH3 – CH = CH – Cl or CH3CH2CH2 – Cl
(5)
8. a) In normal reaction conditions, chlorobenzene does not react with NaOH, but 1-
chloro-4-nitrobenzene reacts with NaOH in these conditions. Explain.
(5)
b) Write the chemical equation and mechanism of pinacol-pinacolone
rearrangement.
(5)
9. a) How will you perform following conversions? (5)
i) Phenol to p-bromophenol
ii) 1,3-dihydroxyphenol to 1-(2,4-dihydroxyphenyl)ethanal
b) How will you prepare tert-butylmethyl ether? (5)
10. a) Arrange the following carbonyl compounds in the order of their favourability for
formation of nitriles:
CH3CH2CHO, CH3COCH3, HCOH and PhCOCH