An alkane can show structural isomerism if it has at least ______ carbon atom
1)1
2)2
3)3
4)4

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Answer:

2) 3 carbons

Explanation:

The alkane with one carbon is methane but it has no isomer.

The alkanes starting with propane only have isomers

Explanation:

An alkane can show structural isomerism if it has at least __4__ carbon atom