IGNOU BCHCT-133 Solved Assignment 2026 (January & July 2026) – BSCG/BSCM/BSCBCH/BSCAPS – English Medium PDF

📌 Programme: BSCG (B.Sc. General), BSCM (B.Sc. Major), BSCBCH (B.Sc. Biochemistry), BSCAPS · Course: BCHCT-133 — Chemical Energetics, Equilibria and Functional Organic Chemistry-I · Session: January 2026 & July 2026 · Last date: 30 Mar 2026 (Jan 2026) / 30 Sep 2026 (Jul 2026), as per IGNOU portal.

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IGNOU BCHCT-133 assignment (January 2026 & July 2026) ke ye sawaal is PDF mein solved hain:

1. Q1. List the differences between thermodynamically reversible and irreversible processes with the suitable examples. 5 marks
2. Q2. Derive a relation between temperature and volume for an adiabatic process. 1.00 mole of helium gas at temperature of 100 ℃ undergoes reversible adiabatic expansion from an initial volume of 5 𝑑𝑚3 to 30 𝑑𝑚3. Calculate the final temperature of the gas by assuming that the helium behaves ideally and has 𝐶𝑉,𝑚 = 12.47 𝐽𝐾−1𝑚𝑜𝑙−1. 5 marks
3. Q3. Two molecule of ∝ −𝐷 −glucose condense in enzyme catalyzed reaction to give a molecule of disaccharide, maltose. Calculate the enthalpy of the reaction. The enthalpies of combustion of crystalline ∝ −𝐷 −glucose and maltose at 25 ℃ are −2809.1 𝑘𝐽𝑚𝑜𝑙−1 and 5645.5 𝑘𝐽𝑚𝑜𝑙−1, respectively. 5 marks
4. Q4. (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. 5 marks
5. Q5. In the equilibrium mixture of three ideal gases A, B, C 𝐴 (𝑔) ⇋ 𝐵 (𝑔) + 𝐶 (𝑔) obtained by dissociation of 𝐴 to the extent of 20 % at a total pressure of 1.0 𝑎𝑡𝑚, what are the partial pressure of 𝐴, 𝐵 and 𝐶. 5 marks
6. Q6. Consider the following reaction 𝑁2 + 3 𝐻2 ⇋ 2𝑁𝐻3 In which direction, towards reactants and towards products, does the reaction shift if the equilibrium is stressed by each change? (i) 𝐻2 is added (ii) 𝑁𝐻3 is added (iii) 𝑁𝐻3 is removed. 5 marks
7. Q7. (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 ℃. 5 marks
8. Q8. (a) Explain the effect of common ion on the ionization equilibrium of weak acids with the help of a suitable example.
   (b) The pH of an aqueous solution of lactic acid 𝐶𝐻3𝐶𝐻(𝑂𝐻)𝐶𝑂𝑂𝐻-a weak acid was found to be 2.7. Calculate the concentration of solution if 𝐾𝑎 for lactic acid is 1.4 × 10−4 . 5 marks
9. Q9. Arrange the following salts of magnesium in the order of increasing solubilities: MgF2, MgCO3, Mg3(PO4)2 [Given (as printed in the official PDF): Ksp = 3.7 × 10⁻⁸; Ksp = 3.5 × 10⁻⁸; and Ksp = 1.0 × 10⁻²⁵ at 25 °C, in the same order as the salts listed]. 5 marks
10. Q10. A 1.00 𝑚𝑜𝑙 sample of 𝑁𝑂𝐶𝑙 was placed in a 2.00 𝐿 reactor and heated to 227 °𝐶 until the system reached equilibrium. The contents of the reactor were then analyzed and found to contain 0.056 𝑚𝑜𝑙 of 𝐶𝑙2. Calculate 𝐾 at this temperature. The equation for the decomposition of 𝑁𝑂𝐶𝑙 to 𝑁𝑂 and 𝐶𝑙2 is as follows: 2𝑁𝑂𝐶𝑙(𝑔) → 2𝑁𝑂(𝑔) + 𝐶𝑙2(𝑔) 5 marks
11. Q11. (a) What is Hückel rule? Define this with suitable example.
    (b) How would you prepare benzene from ethyne? Write its mechanism. 5 marks
12. Q12. (a) What are the limitations of Friedel-Crafts alkylation reactions?
    (b) Write the product of the following reactions: (i) Benzene + H2SO4 + SO3 → ? (ii) Benzene + chlorobenzene with AlCl3 → ? (iii) Benzene + 3H2 with Ni, 425–525 K, 25 atm → ? 5 marks
13. Q13. (a) Write the mechanism of chlorination of methyl benzene.
    (b) Predict the reactant of the following reactions: (i) ? → terephthalic acid (benzene-1,4-dicarboxylic acid) with KMnO4, H2O; (ii) ? → benzoic acid with KMnO4/Δ, then benzoic acid + Br2/FeBr3 → m-bromobenzoic acid; (iii) ? → toluene (methylbenzene) with AlCl3. 5 marks
14. Q14. (a) Arrange the following molecules in order of increasing boiling points. Give reason for this trend: CHCl3, CH2Cl2, CH3Cl, CCl4
    (b) Complete the following reactions: (i) Cyclohexanol + SOCl2 → ? (ii) 1-Methylcyclohexene + HBr (peroxide) → ? (iii) H2C=CHCH2CH3 + Br2 (heat) → ? 5 marks
15. Q15. (a) Which of the following compounds undergo SN1/SN2 reaction? Explain. (i) Benzyl chloride; (ii) Chlorobenzene; (iii) Chloroethene; (iv) Chloroethyne
    (b) Write the product and mechanism of the following reaction: 2-bromoanisole (o-bromomethoxybenzene) + NaNH2 in liquid NH3 → ? 5 marks
16. Q16. Complete the following reaction and write its mechanism: 1-propanol (CH3CH2CH2OH) + TsCl/pyridine → A; A + NaI/acetone → B. 5 marks
17. Q17. Write the mechanism of the formation of salicylic acid from phenol. 5 marks
18. Q18. (a) Give two important features of the crown ethers.
    (b) Write the product for the following reactions: (i) Cyclohexyl tert-butyl ether + HI → ? (ii) Methyloxirane (propylene oxide) + (i) PhMgBr (ii) H3O⁺ → ? (iii) A trisubstituted epoxide (2-ethyl-2,3-dimethyloxirane, stereo-defined) + H2SO4/EtOH → ? 5 marks
19. Q19. How will you prepare primary, secondary and tertiary alcohols from same Grignard reagent? 5 marks
20. Q20. How will you bring about following conversions? (1x5)
    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 5 marks

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