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Simplest organic compounds which contain only carbon and hydrogen are called hydrocarbons.they are straight-chain, branched chain, or cyclic molecules.

straight chain includes- alkanes alkenes and alkynes

branched chain : 2-methylbutane,2,2-dimethylpropane etc.. are eg.s

cyclic : alicyclic and aromatic compounds

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The combination of a hydrogen molecule and carbon molecule is known as hydrocarbons
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