Solved MCQs for B.Sc. 6th (VI) Semester Chemistry
Are you a B.Sc. Chemistry 6th Semester student preparing for your upcoming exams? Multiple Choice Questions (MCQs) are an excellent way to test your understanding and enhance your confidence before the final papers. In this post, we provide carefully selected and solved MCQs from the key topics covered in the sixth semester syllabus. These questions follow the latest university patterns and are ideal for quick revision and practice.
📘 Why Practice MCQs for B.Sc. 6th Semester Chemistry?
Practicing MCQs not only strengthens your grasp on theoretical concepts but also improves your problem-solving speed and accuracy. With topics ranging from Organic Chemistry to Inorganic and Physical Chemistry, MCQs help you focus on important points and prepare effectively.
🧪 Topics Covered in B.Sc. 6th Semester Chemistry
The MCQs provided below cover questions from the following core areas:
- Coordination Chemistry
- Organometallics and Bioinorganic Chemistry
- Spectroscopy (UV, IR, NMR)
- Organic Synthesis and Named Reactions
- Electrochemistry and Surface Chemistry
- Quantum Chemistry and Thermodynamics
✅ Solved MCQs for B.Sc. Chemistry 6th Semester
Warm up questions
Q1. Which of the following ligands is bidentate?
A) NH₃
B) EDTA
C) H₂O
D) CO
Answer: B) EDTA
Q2. In NMR spectroscopy, TMS is used as:
A) Solvent
B) Standard reference
C) Reagent
D) Catalyst
Answer: B) Standard reference
Q3. Wilkinson’s catalyst is used for:
A) Oxidation
B) Hydrogenation of alkenes
C) Hydrolysis
D) Isomerization
Answer: B) Hydrogenation of alkenes
Q4. The unit of molar conductivity is:
A) S m² mol⁻¹
B) Ω⁻¹ cm⁻¹
C) S cm² mol⁻¹
D) Ω cm² mol⁻¹
Answer: C) S cm² mol⁻¹
Q5. Which of the following follows Huckel’s rule?
A) Cyclobutadiene
B) Benzene
C) Cyclooctatetraene
D) Cyclopentadiene
Answer: B) Benzene
Solved MCQs for B.Sc. 6th (VI) semester Chemistry
Q#1 A strong signal at 3400 cm⁻¹ in an IR spectrum indicates the presence of a(n):
(A) Carbonyl
(B) Amine
(C) Alcohol
(D) Alkane
Answer: Alcohol
Q#2 Which bonds would be expected to have the highest frequency stretch?
(A) Carbon–bromine single bond
(B) Carbon–carbon double bond
(C) Carbon–carbon triple bond
(D) Carbon–carbon single bond
Answer: Carbon–carbon triple bond
Q#3 Which bonds would be expected to have the lowest frequency stretch?
(A) C–Cl
(B) C–Br
(C) C–I
(D) C–F
Answer: C–I
Q#4 In UV-Visible spectroscopy, if an auxochrome shifts the position of absorption to a longer wavelength there will be:
(A) Hyperchromic effect
(B) Bathochromic shift
(C) Hypochromic effect
(D) Hypsochromic shift
Answer: Bathochromic shift
Q#5 The separation of resonance frequencies of protons in different structural environments from some chosen standard is called ______
(A) Proton resonance
(B) Chemical exchange
(C) Spin–spin splitting
(D) Chemical shift
Answer: Chemical shift
Q#6 Which is independent of applied magnetic field in PMR spectroscopy?
(A) Spin–spin splitting
(B) Chemical shift
(C) Both of these
(D) None of these
Answer: Spin–spin splitting
Q#7 The compound displays the following PMR spectrum only:
(i) Triplet for 3 protons
(ii) Quartet for 2 protons
It is likely to be:
(A) CH₃CH₂Br
(B) CH₃CH₂OCH₃
(C) CH₃CH₂OH
(D) CH₃–O–CH
Answer: CH₃CH₂Br
Q#8 Which arrangement is most stable?
(A) Triplet state (T₁)
(B) Singlet state (S₁)
(C) Singlet state (S₂)
(D) Triplet state (T₂)
Answer: Triplet state (T₁)
Q#9 Quantum yield for most photochemical reactions is either less or greater than 1, whereas it should have been 1 according to Einstein’s law. It is because of:
(A) Primary processes
(B) Termination processes
(C) Secondary processes
(D) None of these
Answer: Secondary processes
Q#10 Benzophenone reacts with isopropyl alcohol in presence of light to form benzopinacol. The reaction is an example of:
(A) Photodimerization
(B) Photodegradation
(C) Photoisomerization
(D) Photoreduction
Answer: Photoreduction
Q#11 Direct irradiation of butadiene alone results in the reaction:
(A) Photodimerization
(B) Photoisomerization
(C) Photoreduction
(D) Photooxidation
Answer: Photodimerization
Q#12 Photolysis of acetone at room temperature to yield biacetyl and other products is:
(A) Norrish type I reaction
(B) Norrish type II reaction
(C) Paterno–Büchi reaction
(D) None of these
Answer: Norrish type I reaction
Q#13 Photodimerization of dibenzyl ketone to form dibenzyl and CO is a reaction called ______
(A) Photodimerization
(B) Photoisomerization
(C) Norrish type I reaction
(D) Norrish type II reaction
Answer: Norrish type I reaction
Q#14 Hexane-2-one undergoes photolysis to form propene and acetone. The reaction is an example of:
(A) Norrish type I reaction
(B) Paterno–Büchi reaction
(C) Norrish type II reaction
(D) Photoaddition
Answer: Norrish type II reaction
Q#15 Norrish type II reaction involves which of the following?
(A) Hydrogen abstraction
(B) Hydride ion abstraction
(C) Proton abstraction
(D) Rearrangement without abstraction
Answer: Hydrogen abstraction
Q#16 Reaction of ketones and alkenes in the presence of light to form oxetanes is known as:
(A) Norrish type I reaction
(B) Paterno–Büchi reaction
(C) Diels–Alder reaction
(D) Norrish type II reaction
Answer: Paterno–Büchi reaction
Q#17 Photoirradiation of cyclic α,β-unsaturated ketones results in:
(A) Photoreduction
(B) Photodimerization
(C) Photodegradation
(D) Photoisomerization
Answer: Photodimerization
Q#18 Which will absorb at higher wavelength in UV region?
(A) 1,4-Pentadiene
(B) 1,3-Pentadiene
(C) Anthracene
(D) Naphthalene
Answer: Anthracene
Q#19 Which factor will not shift the absorption of ultraviolet radiation to longer wavelength?
(A) Steric hindrance
(B) Resonance
(C) Auxochrome
(D) Conjugation
Answer: Steric hindrance
Q#20 Greatest energy is associated with which radiations?
(A) Ultraviolet
(B) X-ray
(C) Infrared
(D) Visible
Answer: X-ray
Q#21 The electronic transition which requires maximum energy is:
(A) n → σ*
(B) π → π*
(C) n → π*
(D) σ → σ*
Answer: σ → σ*
Q#22 The value of molar extinction coefficient (ε) is related to:
(A) Wavelength of absorption
(B) Probability of transition
(C) Frequency of absorption
(D) All of A, B, and C
Answer: Probability of transition
Q#23 Bathochromic shift is shifting to:
(A) Lower wave number
(B) Higher wave number
(C) Lower wavelength
(D) None of these
Answer: Lower wave number
Q#24 Hypsochromic effect in IR spectrum:
(A) Increases the intensity of absorption
(B) Lowers the intensity of absorption
(C) Lowers the wavelength of absorption
(D) Increases the frequency of absorption
Answer: Lowers the wavelength of absorption
Q#25 A chemical reaction that occurs as a consequence of light absorption is called:
(A) Fluorescence
(B) Photoreduction
(C) Chemiluminescence
(D) Photochemical reaction
Answer: Photochemical reaction
💡 Exam Tips for Chemistry MCQs
- Focus on definitions, laws, and standard values.
- Practice reaction mechanisms and structures.
- Revise named reactions and their applications.
- Review previous year question papers for recurring patterns.
📚 Final Words
We hope these Solved MCQs for B.Sc. 6th Semester Chemistry help boost your confidence and support your preparation. Keep practicing regularly and revise the syllabus thoroughly. For more study materials, notes, and mock tests, stay tuned to our website!
🔍 FAQs – B.Sc. 6th Semester Chemistry MCQs
Q1. Are these MCQs suitable for all universities in India?
Yes, these questions are based on the general syllabus followed by most Indian universities. However, always cross-check with your university syllabus.
Q2. How should I study Chemistry MCQs effectively?
Understand the theory behind each question. Practice regularly, and try mock quizzes to build speed.
Q3. Can I download these MCQs as a PDF?
Yes, we will soon provide a downloadable PDF version for easy offline practice.
Q4. Where can I find MCQs for other semesters?
You can explore our blog section for solved MCQs of other semesters.
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