Class 11 - Chemistry - Alkanes - Questions and Answers
Chapter: Hydrocarbons
Very Short Answer Based Questions (VSQA)
Q1: What are hydrocarbons?
Answer: Hydrocarbons are the compounds of carbon and hydrogen are obtained from coal and petroleum.
Q2: What are alkanes?
Answer: Alkanes are saturated open-chain hydrocarbons containing C—C single bonds.
Q3: How C-C atoms are joined in alkanes? What are the lengths of C-C and C-H bonds?
Answer: In alkanes, C-atoms are tetrahedrally joined together in which C—C and C—H bond lengths are 154 pm and 112 pm respectively.
Q4: What type of hybridisation is found in C-atoms of alkanes?
Answer: All the C-atoms in alkanes are sp³ -hybridised.
Q5: Draw the structure of a methane molecule?
Answer:
Q6: What is the generic formula for alkanes?
Answer: CₙH₂ₙ₊₂
Q7: List the names of the first ten alkane members
Answer:
| No. of C-atoms | Formula (I) | Formula (II) | Name |
|---|---|---|---|
| 1 | CH₄ | CH₄ | Methane |
| 2 | C₂H₆ | CH₃CH₃ | Ethane |
| 3 | C₃H₈ | CH₃CH₂CH₃ | Propane |
| 4 | C₄H₁₀ | CH₃(CH₂)₂CH₃ | Butane |
| 5 | C₅H₁₂ | CH₃(CH₂)₃CH₃ | Pentane |
| 6 | C₆H₁₄ | CH₃(CH₂)₄CH₃ | Hexane |
| 7 | C₇H₁₆ | CH₃(CH₂)₅CH₃ | Heptane |
| 8 | C₈H₁₈ | CH₃(CH₂)₆CH₃ | Octane |
| 9 | C₉H₂₀ | CH₃(CH₂)₇CH₃ | Nonane |
| 10 | C₁₀H₂₂ | CH₃(CH₂)₈CH₃ | Decane |
Structure Of Atom - Important Points To Remember
Mole Concept
Discoveries In Atomic Structure
Law of Chemical Combinations
Thermodynamics
Equilibrium - What are reversible and irreversible reactions?
Four New Elements Added in Periodic Table
Quiz On Gases
Ch 9 - Hydrogen (Very Short Q & A)
Ch14 - Environmental Chemistry - Atmospheric Pollution (Concept Points)
Chemistry Half Year Question Paper (2018-19)
Soaps and Detergents
Periodic Table
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