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Hydrocarbons

Question
CBSEENCH11007903
Wired Faculty App

How will you explain the directive influence of -CHO group?

Solution

This can be explained by considering benzaldehyde in which -CHO group is an electron withdrawing group. The resonation structures of the molecules are:

 
The meta positions become comparatively the centre of high electron density. Hence -CHO group directs the incoming group (electrophile) to attack at the m-position. 

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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