Class XII

Freons diffuses unchanged into the stratosphere. It can --------------------------------------------------------------------------------
  1. Because freons diffuses unchanged into the stratosphere so cannot cause depletion ofozone layer.
  2. Answers B and C
  3. damages the natural ozone balance
  4. initiate radical chain in the stratosphere reactions
Boron is unable to form BF6− ion
  1. the atomic mass of Fluorine is large
  2. None of the above
  3. Due to absence of d orbital
  4. the atomic mass of Fluorine is small
Triiodomethane (Iodoform) is
  1. antiseptic drug
  2. Refrigerant
  3. Pesticide
  4. degreasing agent
For the same alkyl group, an alkyl bromide has a higher boiling point than alkyl fluoride because,
  1. -------------------------------------------------------------------------------- Iodide is bigger in size
  2. Iodide has more electrons
  3. all of these
  4. the magnitude of van der Waal forces
Alkyl halides are insoluble in water
  1. weak hydrogen bonds exist between water molecules
  2. the force of attraction between the alkyl halide and water is weaker and cannot overcome the force of attraction between alkyl halide and alkyl halide as also that of water and water molecules
  3. alkyl halides are non polar compounds
  4. high energy is released when newattractions are set up between the haloalkane and the water molecules
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