Which one of the following has only primary hydrogen atom?

1.	Which one of the following has only primary hydrogen atom?
Answer» isobutane propanamide cyclohexane 2, 3-dimethyl-2butene Solution :`H_(3)C-UNDERSET(underset(CH_(3))(\|))(C )=underset(underset(CH_(3))(\|))(C )-CH_(3)`

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