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IGNOU BCHCT-133 (January 2026 – December 2026) Assignment Questions
1. List the differences between thermodynamically reversible and irreversible processes with the suitable examples.
4. (a) Differentiate between enthalpy driven and entropy driven reactions with the help of suitable examples.
(b) What is the chemical potential? Explain it with its significance.
7. (a) Which factor affect the degree of ionization of weak electrolyte. Explain in brief.
(b) Calculate the pH of 0.010 𝑀 aqueous solution of NaOH at 25 ℃.
8. (a) Explain the effect of common ion on the ionization equilibrium of weak acids with the help of a suitable example.
PART B: FUNCTIONAL GROUP ORGANIC CHEMISTRY-I
11. (a) What is Hückel rule? Define this with suitable example.
(b) How would you prepare benzene from ethyne? Write its mechanism.
12. (a) What are the limitations of Friedel-Crafts alkylation reactions?
(b) Write the product of the following reactions.
13. (a) Write the mechanism of chlorination of methyl benzene.
(b) Predict the reactant of the following reaction:
15. (a) Which of the following compounds undergo 𝑆𝑁1/𝑆𝑁2 reaction? Explain.
(i) Benzyl chloride;
(ii) Chlorobenzene;
(iii) Chloroethene;
(iv) Chloroethyne
17. Write the mechanism of the formation of salicylic acid from phenol.
18. (a) Give two important features of the crown ethers.
(b) Write product for the following reactions:
19. How will you prepare primary, secondary and tertiary alcohols from same Grignard reagent?
20. How will you bring about following conversions?
a) Benzaldehyde to cinnamaldehyde
b) Benzaldehyde to cinnamic acid
c) Acetophenone to dypnone
d) Acetophenone to 1,2,3-triphenylbenzene
e) Acetophenone to 1-Phenyl-1,3-butanedione
IGNOU BCHCT-133 (January 2025 – December 2025) Assignment Questions
