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Hydrocarbons
What are alkynes?
Alkynes. Open chain unsaturated hydrocarbons having the general formula CnH2n-2 and containing one triple bond (– C ≡ C –) in their molecules are called alkynes or acetylenes e.g.
Alkynes are further classified as terminal and non-terminal according to as the triple bond is present at the end of the chain or in between the chain.
The hydrogen atom attached to the terminal carbon is known as acetylenic hydrogen and the anion formed by removing acetylenic hydrogen is called acetylide or alky nide ion.
Naming of alkynes:
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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.
Why is light or heat necessary to initiate chlorination reaction of alkanes?
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