Carbon and Its Compounds – Complete Notes: Carbon is a very important element found in all living organisms. It forms a large number of compounds due to its special properties.
कार्बन एक बहुत महत्वपूर्ण तत्व है जो सभी जीवित प्राणियों में पाया जाता है। यह अपनी विशेष गुणों के कारण बहुत सारे यौगिक बनाता है। For Objective Questions, Visit Learneasily8.
Covalent Bond (सहसंयोजक बंध) in Carbon Compounds
Carbon forms bonds by sharing electrons with other atoms. This type of bond is called a covalent bond.
Example:
CH₄ (Methane)
कार्बन अन्य परमाणुओं के साथ इलेक्ट्रॉनों को साझा करके बंध बनाता है। इसे सहसंयोजक बंध कहते हैं।
उदाहरण:
CH₄ (मीथेन)
Properties of Carbon (कार्बन के गुण)
(1) Catenation (श्रृंखलन)
Carbon can form long chains of carbon atoms.
Example:
C–C–C–C
कार्बन अपने ही परमाणुओं की लंबी श्रृंखला बना सकता है।
(ii) Tetravalency (चतुसंयोजकता)
Carbon has valency 4, so it forms four bonds.
कार्बन की संयोजकता 4 होती है, इसलिए यह चार बंध बनाता है।
Allotropes of Carbon (कार्बन के अपररूप)
| Type | English Description | Hindi Description |
|---|---|---|
| Diamond | Hardest substance | सबसे कठोर पदार्थ |
| Graphite | Good conductor | विद्युत का अच्छा चालक |
| Fullerenes | Special structure | विशेष संरचना |
Carbon and Its Compounds – Complete Notes: Hydrocarbons (हाइड्रोकार्बन)
Compounds made of carbon and hydrogen are called hydrocarbons.
कार्बन और हाइड्रोजन से बने यौगिकों को हाइड्रोकार्बन कहते हैं।
Types (प्रकार) of Hydrocarbons
1. Saturated Hydrocarbons (Alkanes)
- Single bond only
- Example: CH₄
- इसमें केवल एकल बंध होते हैं।
2. Unsaturated Hydrocarbons
- Double or triple bonds
- Example: C₂H₄
इसमें दोहरा या तिहरा बंध होता है।
Read Also: Metals and Non-Metals Class 10 Notes in Hindi + English | Assertion Reason & Case Study Questions
Functional Groups (क्रियात्मक समूह)
| Group | Formula | Example |
|---|---|---|
| Alcohol | –OH | Ethanol |
| Carboxylic Acid | –COOH | Ethanoic acid |
| Aldehyde | –CHO | Methanal |
ये समूह यौगिक के गुण निर्धारित करते हैं।
Homologous Series (समजात श्रेणी)
A series of compounds with similar structure and properties.
Example:
CH₄, C₂H₆, C₃H₈
Hindi:
ऐसे यौगिक जिनकी संरचना समान होती है और गुण मिलते-जुलते होते हैं।
Nomenclature (नामकरण)
Rules:
- 1 Carbon → Meth
- 2 Carbon → Eth
- 3 Carbon → Prop
Example:
- CH₄ → Methane
- C₂H₆ → Ethane
Important Chemical Reactions (महत्वपूर्ण अभिक्रियाएँ)
(i) Combustion (दहन)
Carbon compounds burn in air to produce CO₂ + heat.
Example:
CH₄ + O₂ → CO₂ + H₂O
(ii) Oxidation (ऑक्सीकरण)
Addition of oxygen.
(iii) Addition Reaction (संयोजन अभिक्रिया)
Hydrogen adds to unsaturated compounds.
(iv) Substitution Reaction (प्रतिस्थापन अभिक्रिया)
One atom replaces another.
Ethanol and Ethanoic Acid
Ethanol (C₂H₅OH)
Uses:
- Fuel
- Medicine
ईंधन और दवा में उपयोग
Ethanoic Acid (CH₃COOH)
Common name: Acetic acid
Uses:
- Vinegar
- Food preservation
READ MORE: Acids, Bases and Salts Class 10 Notes in Hindi + English | Assertion Reason & Case Study Questions
Soaps and Detergents (साबुन और डिटर्जेंट)
🧼 Soap (साबुन)
- Made from natural oils
- Does not work well in hard water
🧴 Detergent (डिटर्जेंट)
- Works in hard water
Cleansing Action (सफाई क्रिया)
Soap molecules form micelles that trap dirt.
Hindi:
साबुन के अणु मैल को घेरकर साफ करते हैं।
Important Points for Exam (परीक्षा के लिए महत्वपूर्ण बिंदु)
- Carbon forms covalent bonds
- Shows catenation and tetravalency
- Hydrocarbons are of two types
- Functional groups decide properties
- Ethanol and ethanoic acid are important
Conclusion (निष्कर्ष)
Carbon is a versatile element that forms a wide variety of compounds essential for life and industry.
Hindi:
कार्बन एक बहुमुखी तत्व है जो जीवन और उद्योग के लिए अत्यंत महत्वपूर्ण यौगिक बनाता है।
Assertion–Reason Questions: Carbon and Its Compounds
👉 Instructions:
For each question, choose the correct option:
(A) Both Assertion and Reason are true, and Reason is the correct explanation of Assertion
(B) Both Assertion and Reason are true, but Reason is not the correct explanation
(C) Assertion is true, but Reason is false
(D) Assertion is false, but Reason is true
Q1. Assertion: Carbon forms a large number of compounds.
Reason: Carbon shows catenation property.
👉 Answer: (A)
Q2. Assertion: Carbon forms covalent bonds.
Reason: Carbon cannot easily gain or lose electrons.
👉 Answer: (A)
Q3. Assertion: Diamond is a good conductor of electricity.
Reason: It has free electrons.
👉 Answer: (D)
Q4. Assertion: Graphite conducts electricity.
Reason: It has free electrons.
👉 Answer: (A)
Q5. Assertion: Saturated hydrocarbons are less reactive.
Reason: They have only single bonds.
👉 Answer: (A)
Q6. Assertion: Unsaturated hydrocarbons undergo addition reactions.
Reason: They contain double or triple bonds.
👉 Answer: (A)
Q7. Assertion: Ethanol is used as fuel.
Reason: It produces clean energy when burned.
👉 Answer: (A)
Q8. Assertion: Ethanoic acid turns blue litmus red.
Reason: It is acidic in nature.
👉 Answer: (A)
Q9. Assertion: Soap does not work well in hard water.
Reason: It forms scum with calcium and magnesium ions.
👉 Answer: (A)
Q10. Assertion: Detergents are effective in hard water.
Reason: They do not form scum with ions.
👉 Answer: (A)
Q11. Assertion: Covalent compounds have low melting and boiling points.
Reason: They have weak intermolecular forces.
👉 Answer: (A)
Q12. Assertion: Carbon has valency 4.
Reason: It has 4 electrons in its outermost shell.
👉 Answer: (A)
Q13. Assertion: Methane is a saturated hydrocarbon.
Reason: It has only single bonds.
👉 Answer: (A)
Q14. Assertion: Ethene decolorizes bromine water.
Reason: It is an unsaturated hydrocarbon.
👉 Answer: (A)
Q15. Assertion: Functional groups determine chemical properties.
Reason: They are reactive parts of molecules.
👉 Answer: (A)
Q16. Assertion: Homologous series have similar chemical properties.
Reason: They have the same functional group.
👉 Answer: (A)
Q17. Assertion: Carbon compounds are poor conductors of electricity.
Reason: They do not have free ions.
👉 Answer: (A)
Q18. Assertion: Addition reactions are used to convert unsaturated compounds to saturated ones.
Reason: Hydrogen is added to break double bonds.
👉 Answer: (A)
Q19. Assertion: Vinegar contains ethanoic acid.
Reason: Ethanoic acid gives sour taste.
👉 Answer: (A)
Q20. Assertion: Soap molecules form micelles in water.
Reason: Soap has hydrophilic and hydrophobic ends.
👉 Answer: (A)
Read Also: Chemical Reactions and Chemical Equations Class 10 Notes (Hindi + English)
Case Study Questions: Carbon and Its Compounds
Case Study 1: Catenation and Tetravalency
Passage (English):
Carbon has a unique ability to form long chains of atoms, known as catenation. It also has a valency of four, allowing it to form stable covalent bonds with many elements.
अनुच्छेद (Hindi):
कार्बन में अपने ही परमाणुओं की लंबी श्रृंखला बनाने की क्षमता होती है जिसे श्रृंखलन कहते हैं। इसकी संयोजकता 4 होती है, जिससे यह स्थिर सहसंयोजक बंध बनाता है।
Questions:
- Why does carbon form a large number of compounds?
कार्बन इतने अधिक यौगिक क्यों बनाता है?
(A) Due to low atomic mass
(B) Due to catenation and tetravalency
(C) Due to high reactivity
(D) Due to metallic nature
Answer: (B)
- What is catenation?
श्रृंखलन क्या है?
Answer: Ability of carbon to form long chains of atoms.
(कार्बन द्वारा लंबी श्रृंखला बनाना)
- Assertion: Carbon forms stable bonds.
Reason: Carbon shares electrons.
Answer: (A)
- Name one compound showing catenation.
Answer: Ethane (C₂H₆)
Case Study 2: Hydrocarbons
Passage (English):
Hydrocarbons are compounds made of carbon and hydrogen. They are classified into saturated and unsaturated hydrocarbons depending on the type of bonds present.
अनुच्छेद (Hindi):
हाइड्रोकार्बन कार्बन और हाइड्रोजन से बने यौगिक होते हैं। इन्हें बंध के प्रकार के आधार पर संतृप्त और असंतृप्त में बाँटा जाता है।
Questions:
- Which type of hydrocarbon has double bonds?
(A) Alkane
(B) Alkene
(C) Alcohol
(D) Acid
Answer: (B)
- Give one example of saturated hydrocarbon.
Answer: Methane (CH₄)
- What happens in addition reaction?
Answer: Hydrogen adds to unsaturated compounds.
- Assertion: Alkanes are less reactive.
Reason: They have only single bonds.
Answer: (A)
Case Study 3: Ethanol and Ethanoic Acid
Passage (English):
Ethanol is an alcohol used as fuel and solvent. Ethanoic acid is a weak acid used in vinegar and food preservation.
अनुच्छेद (Hindi):
एथेनॉल एक अल्कोहल है जिसका उपयोग ईंधन और विलायक के रूप में होता है। एथेनोइक अम्ल एक कमजोर अम्ल है जिसका उपयोग सिरके में होता है।
Questions:
- What is the functional group of ethanol?
Answer: –OH
- What is the common name of ethanoic acid?
Answer: Acetic acid
- Why is ethanoic acid acidic?
Answer: It releases H⁺ ions in solution.
- Assertion: Ethanol is used as fuel.
Reason: It burns to produce heat.
Answer: (A)
Case Study 4: Soaps and Detergents
Passage (English):
Soaps are made from natural oils and fats, while detergents are synthetic. Soap molecules have a hydrophilic and hydrophobic end, forming micelles to clean dirt.
अनुच्छेद (Hindi):
साबुन प्राकृतिक तेलों से बनता है जबकि डिटर्जेंट कृत्रिम होते हैं। साबुन के अणु जल-प्रेमी और जल-विमुख भाग रखते हैं जो मैल हटाते हैं।
Questions:
- Why does soap not work in hard water?
Answer: Forms scum with Ca²⁺ and Mg²⁺ ions
- What is micelle formation?
Answer: Soap molecules surround dirt particles
- Which is better in hard water?
(A) Soap
(B) Detergent
(C) Both
(D) None
Answer: (B)
- Assertion: Detergents clean better in hard water.
Reason: They do not form scum.
Answer: (A)
Case Study 5: Allotropes of Carbon
Passage (English):
Carbon exists in different forms called allotropes such as diamond and graphite. Diamond is very hard, while graphite conducts electricity.
अनुच्छेद (Hindi):
कार्बन के विभिन्न रूप होते हैं जिन्हें अपररूप कहते हैं जैसे हीरा और ग्रेफाइट। हीरा कठोर होता है जबकि ग्रेफाइट विद्युत का चालक होता है।
Questions:
- Which allotrope conducts electricity?
Answer: Graphite
- Why is diamond hard?
Answer: Strong 3D network of bonds
- Assertion: Diamond is used in cutting tools.
Reason: It is very hard.
Answer: (A)
- Assertion: Graphite is soft.
Reason: Layers slide over each other.
Answer: (A)