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Give the common name for the following compound (CH₃)₂CHCH₂-Br

A. Isobutyl bromide

B. Methyl bromide

C. propyl bromide

D. Butyl bromide

QUICK ANSWER…

A

DETAILS…

The common name for the following compound (CH₃)₂CHCH₂-Br is Isobutyl bromide, this is because it is an isomer of butyl bromide.

Recall that the compound can be arranged as follows:

This can be named as 1-bromo-2methylpropane which is an isomer of ordinary butyl bromide with the formula C₄H₉-Br. This is why it is called isobutyl bromide.

Now for the right answer to the above question:

1. Option A is correct. it is commonly called isobutyl bromide because the compound is an isomer of butyl bromide.
2. Option B is incorrect. not a methyl bromide.
3. C is incorrect. not a propyl bromide.
4. D is not the correct answer. not a butyl bromide but its isomer.

KEY-POINTS…

You may please note these/this:

• The compound (CH₃)₂CHCH₂-Br = 1-Bromo-2methylpropane.
• 1-Bromo-2methylpropane is an isomer of butyl bromide C₄H₉-Br.
• So, 1-Bromo-2methylpropane = isobutyl bromide.

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/ culled from 2021 JAMB-UTME CHEMISTRY question 1 /