Chapter Exam

Chapter 11: Fundamentals of Organic Chemistry — Online MCQ Test

Q: Which of the following is considered the fundamental element of organic chemistry?

Answer: B. Carbon — Organic chemistry is defined as the study of carbon-containing compounds.

Q: The process of purifying a solid organic compound by dissolving it in a suitable solvent at high temperature and then cooling is called:

Answer: C. Recrystallization — Recrystallization is the standard method for purifying solid organic compounds based on differential solubility.

Q: In the Lassaigne's test for nitrogen, the blue color is due to the formation of:

Answer: A. Ferric ferrocyanide — The blue color in Lassaigne's test is due to the formation of Prussian blue, which is ferric ferrocyanide.

Q: Compare the acidity of phenol, ethanol, and acetic acid. Which order is correct?

Answer: B. Acetic acid > Phenol > Ethanol — Acetic acid is the strongest due to resonance stabilization of the carboxylate ion, followed by phenol, then ethanol.

Q: In a Dumas method, if 0.3g of an organic compound gives 50ml of nitrogen collected at 300K and 715mm Hg pressure, the percentage of nitrogen is approximately:

Answer: C. 20% — Using PV=nRT and calculating mass of N2, the percentage is determined to be approximately 20%.

CHEMISTRY · CLASS 11th · Tamil Nadu State Board

Practice Chapter 11: Fundamentals of Organic Chemistry with a free chapter-wise online MCQ test for Tamil Nadu State Board CLASS 11th CHEMISTRY. This chapter covers: Exploring organic chemistry foundations this chapter details classification IUPAC nomenclature structural isomerism and stereoisomerism. Students study organic compound purificatio.... AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter 11: Fundamentals of Organic Chemistry — Important Questions & Answers (FAQ)

Frequently asked questions from Tamil Nadu State Board CLASS 11th CHEMISTRY — Chapter 11: Fundamentals of Organic Chemistry, with answers and explanations. These are sample questions; the exam has its own separate question set.

Which of the following is considered the fundamental element of organic chemistry?

A. Oxygen
B. Carbon ✓
C. Nitrogen
D. Hydrogen

Answer: B. Carbon
Organic chemistry is defined as the study of carbon-containing compounds.

The process of purifying a solid organic compound by dissolving it in a suitable solvent at high temperature and then cooling is called:

A. Sublimation
B. Distillation
C. Recrystallization ✓
D. Chromatography

Answer: C. Recrystallization
Recrystallization is the standard method for purifying solid organic compounds based on differential solubility.

In the Lassaigne's test for nitrogen, the blue color is due to the formation of:

A. Ferric ferrocyanide ✓
B. Ferrous ferricyanide
C. Ferrous ferrocyanide
D. Ferric ferricyanide

Answer: A. Ferric ferrocyanide
The blue color in Lassaigne's test is due to the formation of Prussian blue, which is ferric ferrocyanide.

Compare the acidity of phenol, ethanol, and acetic acid. Which order is correct?

A. Ethanol > Phenol > Acetic acid
B. Acetic acid > Phenol > Ethanol ✓
C. Phenol > Acetic acid > Ethanol
D. Acetic acid > Ethanol > Phenol

Answer: B. Acetic acid > Phenol > Ethanol
Acetic acid is the strongest due to resonance stabilization of the carboxylate ion, followed by phenol, then ethanol.

In a Dumas method, if 0.3g of an organic compound gives 50ml of nitrogen collected at 300K and 715mm Hg pressure, the percentage of nitrogen is approximately: