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Hydrocarbons
5 Class 12 Chemistry questions with answers and explanations.
Printable worksheet with answer key
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Benzene has the formula:
- 1 C6H6
- 2 C5H5
- 3 C6H14
- 4 C6H12
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Alkenes mainly undergo:
- 1 No reactions
- 2 Elimination only
- 3 Substitution reactions only
- 4 Addition reactions
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The hybridisation of carbon in ethene is:
- 1 sp2
- 2 sp
- 3 sp3d
- 4 sp3
Show answer
Correct answer: sp2
Each carbon in ethene forms three sigma bonds, so sp2.
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Addition of HBr to propene follows Markovnikov's rule to give mainly:
- 1 Bromopropene
- 2 1-bromopropane
- 3 2-bromopropane
- 4 Propane
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Correct answer: 2-bromopropane
Hydrogen adds to the carbon with more hydrogens, so bromine goes on the middle carbon.
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Benzene reacts mainly by:
- 1 Nucleophilic addition
- 2 Addition
- 3 Free radical chain only
- 4 Electrophilic substitution
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Correct answer: Electrophilic substitution
The stable ring is kept and a hydrogen is replaced.