Chapter Exam

Unit 13: Organic Chemistry - Hydrocarbon and Aromatic Hydrocarbon — Online MCQ Test

Q: Which of the following is the correct IUPAC name for CH3-CH2-CH3?

Answer: A. Propane — CH3-CH2-CH3 is a straight-chain alkane with three carbon atoms, so its IUPAC name is propane.

Q: The general formula of alkenes is:

Answer: B. CnH2n — Alkenes contain one carbon-carbon double bond, and for open-chain compounds their general formula is CnH2n.

Q: How many structural isomers are possible for C4H10?

Answer: B. 2 — C4H10 has two structural isomers: n-butane and isobutane (2-methylpropane).

Q: Which of the following compounds will have the highest number of structural isomers among the options?

Answer: C. C5H12 — Pentane (C5H12) has three structural isomers, which is more than the other options listed.

Q: A hydrocarbon gives a sooty flame and undergoes electrophilic substitution with chlorine in the presence of FeCl3. The compound is most likely:

Answer: C. Benzene — Benzene burns with a sooty flame due to its high carbon content and undergoes substitution with chlorine in the presence of Lewis acid catalysts like FeCl3.

CHEMISTRY · CLASS 11 INTERMEDIATE 1 YEAR · Telangana State Board

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Unit 13: Organic Chemistry - Hydrocarbon and Aromatic Hydrocarbon — Important Questions & Answers (FAQ)

Frequently asked questions from Telangana State Board CLASS 11 INTERMEDIATE 1 YEAR CHEMISTRY — Unit 13: Organic Chemistry - Hydrocarbon and Aromatic Hydrocarbon, with answers and explanations. These are sample questions; the exam has its own separate question set.

Which of the following is the correct IUPAC name for CH3-CH2-CH3?

A. Propane ✓
B. Propene
C. Propyne
D. Methylethane

Answer: A. Propane
CH3-CH2-CH3 is a straight-chain alkane with three carbon atoms, so its IUPAC name is propane.

The general formula of alkenes is:

A. CnH2n+2
B. CnH2n ✓
C. CnH2n-2
D. CnHn

Answer: B. CnH2n
Alkenes contain one carbon-carbon double bond, and for open-chain compounds their general formula is CnH2n.

How many structural isomers are possible for C4H10?

A. 1
B. 2 ✓
C. 3
D. 4

Answer: B. 2
C4H10 has two structural isomers: n-butane and isobutane (2-methylpropane).

Which of the following compounds will have the highest number of structural isomers among the options?

A. C3H8
B. C4H10
C. C5H12 ✓
D. C2H6

Answer: C. C5H12
Pentane (C5H12) has three structural isomers, which is more than the other options listed.

A hydrocarbon gives a sooty flame and undergoes electrophilic substitution with chlorine in the presence of FeCl3. The compound is most likely:

A. Ethane
B. Ethene
C. Benzene ✓
D. Propane

Answer: C. Benzene
Benzene burns with a sooty flame due to its high carbon content and undergoes substitution with chlorine in the presence of Lewis acid catalysts like FeCl3.

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