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The name for

is…

• A. 1 -methylpentane 
• B. 3-methylbutane
• C. 2-methylbutane 
• D. 1 -dimethylpropane

QUICK ANSWER…

C

SOLUTION…  

The following steps can be used to name the compound above:

• Take the longest carbon chain = 4 (and not 3) = butane (since all the bonds are single bonds)
• Then take the shortest route to the branched chain. This means the methyl group is attached to carbon number 2 and not 3.
• Name the compound according to the above rules as 2-methylbutane

Now for the right answer to the above question:

1. Option A is incorrect. the methyl group is not attached to the first carbon.
2. Option B is incorrect. the methyl group is not attached to the 3rd carbon, assuming the shortest route.
3. C is correct. The methyl group is attached to the second carbon, assuming the shortest route.
4. D is not the correct answer. The longest chain will include one of the extreme carbons on the left-hand side. Don’t be deceived by the diagram.

QUICK TIPS…

You may please note these/this:

• There is a set of rules to be obeyed when naming organic compounds, learn these rules and keep yourself updated.

Use the questions and answers session to deal further on this topic…

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/ culled from 2018 JAMB-UTME Chemistry question 17 /