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Which compound is an unsaturated hydrocarbon?

(1) hexanal (3) hexanoic acid
(2) hexane (4) hexyne

1 Answer

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The answer is (4) hexyne. The definition of unsaturated hydrocarbon is that there is one or more double bonds between carbon atoms. In hexanal and hexanoic acid, there is also double bond but it is not between carbon atoms. So they are not unsaturated hydrocarbon.
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