BCHCT 131 Atomic Structure, Bonding, General Organic Chemistry And Aliphatic Hydrocarbons Solved Assignment 2025-26

BCHCT 131 Atomic Structure, Bonding, General Organic Chemistry And Aliphatic Hydrocarbons Solved Assignment is specially prepared for BSCG and BSCM students who want clarity, accuracy, and safe scoring in IGNOU Chemistry. This paper covers atomic models, quantum mechanics, molecular orbital theory, stereochemistry, reaction mechanisms, elimination rules, carbocation stability, alkanes, alkynes, and synthesis reactions. Each answer is written strictly as per IGNOU mark distribution with correct chemical symbols, equations, configurations, and structured explanations so you know exactly what to write and how much to write.

Why BCHCT 131 Requires Precision in Writing

Chemistry assignments are different from theory subjects. Even a small mistake in equation, configuration, or rule can reduce marks. Examiners check clarity of reaction mechanism, correct stereochemical assignment, proper use of rules like Markowinkoff, Saytzeff, Fajan’s rule, and accurate molecular orbital logic. That is why structured, symbol-accurate and step-wise explanations are essential.

BCHCT 131 Assignment Questions (As Per IGNOU)

PART – A

Explain Geiger and Marsden’s α-particle experiment using a suitable diagram. (5)

(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. (5)

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

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

(b) Explain the significance of ψ and ψ². (2)

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

(a) Explain the stability of half-filled and completely filled orbitals giving suitable examples. (3)

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

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

(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)

(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⁻ (3)

(a) Draw pπ-pπ combination 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

(a) Assign the E or Z configuration to the given molecule and explain the steps involved. (3)

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

(a) Assign R/S configuration to the given compound and explain the steps involved. (3)

(b) Give example of a meso compound. Also comment on its optical activity giving reason. (2)

Draw the energy profile for various conformations exhibited by cyclohexane and explain their relative energies. (5)

Explain the relative stability of the following carbocations: (i) methyl carbocation (ii) tertiary carbocation (iii) primary carbocation (iv) secondary carbocation (5)

(a) Differentiate between basicity and nucleophilicity with suitable examples. (3)

(b) Briefly explain the mechanism of β-elimination. (2)

(a) Explain Kolbe’s electrolytic method for synthesis of alkanes. (5)

(b) What is aromatisation of gasoline? Illustrate with reactions. (2)

State and explain Saytzeff rule with example. (3)

Explain retro Diels-Alder reaction with example. (2)

(a) State Markowinkoff’s Rule and explain peroxide effect. (3)

(b) Write reactions for hydroboration of propene followed by oxidation by alkaline H₂O₂. (2)

(a) How will you prepare 3-octyne from 1-hexyne? Explain steps. (3)

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

BCHCT 131 Assignments Details

Course Code: BCHCT-131 Course Name: Atomic Structure, Bonding, General Organic Chemistry And Aliphatic Hydrocarbons Programme: BSCG / BSCM University: IGNOU Assignment Code: BCHCT-131/TMA/2026 Maximum Marks: 100 Weightage: 30%

BCHCT 131 Assignment Submission End Date-upto

For students enrolled in July 2025: 30th April 2026 – Coordinator of the learner support center For students enrolled in January 2026: 30th September 2026 – Coordinator of the learner support center

How This BCHCT 131 Solved Assignment Helps You Score

Each answer is structured according to 2, 3, and 5 mark expectations. Mechanisms are written step-by-step. Hybridisation, MO configurations, carbocation stability and stereochemical assignments are clearly explained with logic. Chemical symbols, superscripts, subscripts and reaction arrows are preserved exactly as required in IGNOU format so you don’t lose marks for technical errors.

Why Choose Our BCHCT 131 IGNOU Solved Assignments?

• Answers follow exact IGNOU chemistry depth with correct reactions, rules, mechanisms, and stereochemical logic.
• Mark-wise structured writing prevents overwriting and under-writing mistakes.
• Complex topics like MO theory and R/S configuration are simplified step-by-step.
• Correct chemical equations and symbols are preserved without alteration.
• Fully aligned with 2025-26 assignment booklet.
• Strong conceptual clarity helps in term-end exam preparation.

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FAQs

Is BCHCT 131 difficult?

BCHCT 131 becomes difficult only when concepts like MO theory, stereochemistry, and reaction mechanisms are not clearly understood. With structured explanations and correct chemical representation, it becomes a scoring paper.

Can I copy these answers directly?

You should rewrite answers in your own handwriting. This PDF guides you on structure, reaction steps, and mark-wise depth so you can safely reproduce them.

Are chemical symbols and reactions preserved?

Yes. All equations, subscripts, superscripts, configurations and reaction arrows are kept exactly as required in IGNOU format.

Will this help in term-end exams?

Yes. Most theoretical questions repeat in exams. Preparing assignments improves conceptual clarity and answer presentation.

Is this assignment valid for 2025-26?

Yes. It is strictly based on the official 2025-26 IGNOU assignment booklet and follows current evaluation standards.

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