Selected MCQ

Current Question
In SN1 reactions, the rate-determining step is:
  • A. Nucleophilic attack
  • B. Carbocation formation
  • C. Proton transfer
  • D. Solvent evaporation
Correct Answer: B
Explanation:
SN1 rate depends on unimolecular leaving-group departure to form a carbocation.
Related Question 1
Which hormone controls metabolism rate?
  • A. Insulin
  • B. Thyroxine
  • C. Adrenaline
  • D. Estrogen
Correct Answer: B
Explanation:
Thyroxine regulates metabolic rate.
Related Question 2
Which phenomenon demonstrates quantization of angular momentum?
  • A. Diffraction
  • B. Zeeman effect
  • C. Photoelectric effect
  • D. Reflection
Correct Answer: B
Explanation:
Zeeman splitting arises from quantized angular momentum states.
Related Question 3
Which hormone increases heart rate?
  • A. Insulin
  • B. Adrenaline
  • C. Thyroxine
  • D. Estrogen
Correct Answer: B
Explanation:
Adrenaline stimulates cardiac activity.
Related Question 4
Which stage of mitosis separates sister chromatids?
  • A. Prophase
  • B. Metaphase
  • C. Anaphase
  • D. Telophase
Correct Answer: C
Explanation:
Chromatids move to opposite poles.
Related Question 5
Which process generates NADH?
  • A. Glycolysis
  • B. Photosynthesis light reaction
  • C. Fermentation only
  • D. Translation
Correct Answer: A
Explanation:
Glycolysis produces NADH.