Hydrocarbons are important organic compounds made of carbon and hydrogen, found in fuels like petrol, natural gas, and diesel. In Class 9 Chemistry Chapter 11, students will learn about alkanes, their structure, properties, and important reactions. This chapter also includes MCQs, short questions, and important long questions, making it very useful for exam preparation and building a strong foundation in organic chemistry.
📥 Download Chapter 11 Hydrocarbons Notes PDF
Skip to PDF contentStudents can now download the complete Class 10 Chemistry Chapter 11 – Hydrocarbons notes in PDF. These notes are written in easy-to-understand language, exam-focused, and cover all important topics:
-
Overview of Hydrocarbons
-
Alkanes and their properties
-
Important reactions of alkanes
-
MCQs, short questions, and important long questions
👉 Download Hydrocarbons Notes PDF
Frequently Asked Questions (FAQs)
Q1: What are hydrocarbons?
Hydrocarbons are organic compounds made up of only carbon and hydrogen atoms.
Q2: What are alkanes?
Alkanes are saturated hydrocarbons that contain only single bonds between carbon atoms.
Q3: Why are alkanes less reactive?
Because they have strong single bonds (C–C and C–H), which are difficult to break.
Q4: What is the main use of alkanes?
Alkanes are mainly used as fuels such as methane, propane, and butane.
Q5: What are important reactions of alkanes?
The main reactions include combustion, substitution, and cracking.
MCQs – Class 9 Chemistry Chapter 11
1. Hydrocarbons are compounds containing:
A) Carbon and Oxygen
B) Hydrogen and Oxygen
C) Carbon and Hydrogen ✅
D) Nitrogen and Hydrogen
2. General formula of alkanes is:
A) CₙH₂ₙ
B) CₙH₂ₙ₊₂ ✅
C) CₙH₂ₙ₋₂
D) CₙHₙ
3. Alkanes are also called:
A) Unsaturated hydrocarbons
B) Aromatic compounds
C) Saturated hydrocarbons ✅
D) Alcohols
4. Which bond is present in alkanes?
A) Double bond
B) Triple bond
C) Single bond ✅
D) Ionic bond
5. Alkanes are generally:
A) Highly reactive
B) Less reactive ✅
C) Very acidic
D) Soluble in water