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Chemistry · Grades 10–12

Branched alkanes and locants · Revision sheet

Choose a parent chain and explain what a position number means.

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Learn the idea

Parent

For these simple acyclic alkanes, choose the longest continuous carbon chain.

Branches

A methyl group contributes one carbon outside the chosen chain.

Numbering

Number the chain to give the substituents the appropriate lowest set of locants.

Check

Count total carbons after naming and compare the described connectivity with the starting structure.

Explain without looking

  1. How many methyl substituents are indicated by dimethyl?
  2. Why can counting all carbons and adding -ane give an incorrect name for a branched structure?

Further reading and review references

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Independent educational review required. Grade bands are approximate; these are not officially aligned curricula.