1. Which structural feature is found in most unsaturated hydrocarbons and never in a saturated hydrocarbon? O a branched carbon chain a single covalent bond O bonds between carbon and hydrogen atoms O a double or triple covalent bond​

Saturated hydrocarbons can form only single covalent bond while unsaturated hydrocarbons can form double or triple bond

Therefore A double or triple covalent bond

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if you're asking what comes out, it's steam.