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Hydrocarbons

Question

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what are annulenes? Give one example.

Solution

These are monocyclic conjugated polyenes which contain an even number of carbon atoms in their molecules. For example [6] annulene.

[6] Annulene is aromatic because it contains

left parenthesis 4 straight n plus 2 right parenthesis straight pi space electrons

.

Some More Questions From Hydrocarbons Chapter

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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