Class 9 Chemistry · Chapter 11 · Test 3
Important Reactions of Alkanes
24 MCQs covering the chemical reactivity of alkanes paraffins halogenation substitution reactions photochemical reactions chlorine substitution and combustion of alkanes.
24 questions · 20 min · 24 marks
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Sample questions
The first 5 of 24. Try each one, then tap to see the answer.
Question 1
What does the term paraffin mean when used for alkanes?
- ALittle affinity
- BHigh reactivity
- CStrong acidity
- DHigh solubility
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Answer: A
Alkanes are called paraffins which means little affinity.
Question 2
Why are alkanes chemically inert to most laboratory reagents?
- ATheir bonds are almost non-polar
- BThey contain ionic bonds
- CThey contain free electrons
- DThey are highly acidic
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Answer: A
The C-H and C-C bonds are almost equally shared because carbon and hydrogen have similar electronegativities.
Question 3
What type of bonds make alkanes almost non-polar?
- AC-H and C-C bonds
- BC-O and O-H bonds
- CC-Cl and H-Cl bonds
- DN-H and N-O bonds
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Answer: A
C-H and C-C bonds are almost equally shared and make alkanes almost non-polar.
Question 4
Which reaction is an important reaction of alkanes?
- AHalogenation
- BNeutralization
- CPrecipitation
- DElectrolysis
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Answer: A
Alkanes undergo halogenation under suitable conditions.
Question 5
What happens in a substitution reaction of an alkane?
- AA hydrogen atom is replaced by another atom or group of atoms
- BHydrogen atoms are all removed
- CCarbon atoms are removed
- DOxygen is added to every carbon
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Answer: A
In substitution reactions a hydrogen atom of an alkane is replaced by another atom or group of atoms.
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