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Hydrocarbons
(i) The addition of hydrogen. Benzene reacts with hydrogen in the presence of a catalyst such as nickel or platinum at 473 to 573K under pressure to form cyclohexane.
(ii) The addition of halogens. Benzene reacts with chlorine or bromine in the presence of sunlight and absence of halogen carrier to form benzene hexachloride or benzene hexabromide.
BHC is used as an insecticide. It is sold under the name Gammexane or lindane.
(iii) The addition of ozone. Benzene reacts with ozone to form benzene tri ozonide.
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Name the metal which is a constituent of Grignard's reagent.
Name the products formed when an ethereal solution containing ethyl iodide and methyl iodide is heated with sodium metal.
Alkanes are less reactive. Why?
Out of n-pentane, isopentane and neopentane which has lower boiling point?
During the pyrolysis of alkanes C-C bonds break in preference to C-H bond. Why?
Define cracking.
What is the function of iodic acid in the iodination of alkanes? Can we use any other substance in its place?
What is alternation effect?
Arrange the following compounds in order of their increasing boiling points:
n-Pentane, n-Hexane, Ethane, 2-2-Dimethylpentane, 2-Methylpentane.
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