CBSE  /  Class 12  /  Chemistry  /  Haloalkanes and Haloarenes

  • 1. 
    Good conductor of electricity and heat is

  • Anthracite coke
  • Diamond
  • Graphite
  • Charcoal

  • 2. 
    In which of the following allotropes of carbon, percentage of carbon is maximum?

  • Wood charcoal
  • Coconut charcoal
  • Graphite
  • None of these

  • 3. 
    The hybridisation of carbon in diamond is

  • sp
  • sp
  • sp
  • dsp

  • 4. 
    Organic compound must contain an element

  • oxygen
  • carbon
  • hydrogen
  • nitrogen

  • 5. 
    Alkene gives which of the following reactions?

  • Addition reaction
  • Substitution reaction
  • Both (a) and (b)
  • None of these

  • 6. 
    Single bond length between carbon-carbon is

  • 1.34 Å
  • 1.20 Å
  • 1.54 Å
  • none of these

  • 7. 
    Valency of carbon is

  • 1
  • 2
  • 3
  • 4

  • 8. 
    Criteria for purity of organic solid is

  • boiling point
  • melting point
  • specific gravity
  • none of these

  • 9. 
    Hybridisation of carbon in ethane is

  • sp
  • sp
  • sp
  • sp

  • 10. 
    Number of π bonds in ethyne is

  • 1
  • 2
  • 3
  • 4
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