Question

A hydrocarbon has four carbon atoms in it. Suggest three skeleton structures it can form.

Answer 1

it can form only 2
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Answer 2

1.CH3-CH2-CH2-CH2 (butane)
2.CH2=CH-CH2-CH3 (butene)
3.CH≡C-CH2-CH3 (butyene)
4.CH3-CH-CH3 (2-methlypropane)
              ↓
            CH3