9.13 - bonds usually are not drawn in to chemical formulas...

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Key: 13. Which of the following is an example of an alcohol which contains a double bond? a. methanol, which is methane with one hydrogen atom replaced by -OH. b. ethanol, which is CH 3 CH 2 OH c. benzene d. CH 2 CHOH e. H 2 C=CNH 2 f. none of these This problem requires you to understand functional groups and chemical notations. The only functional group that you really need to recognize is an alcohol group which is –OH. Let’s look at them one at a time. Answers a and b are wrong because there is no double bond. Answer c is wrong because there is no alcohol group Answer d is correct because there is both a double bond and an alcohol group. This is challenging because the double bond was not drawn in like it was in choice e. Since double
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Unformatted text preview: bonds usually are not drawn in to chemical formulas, it is important to be able to recognize them. Since there are only two hydrogens attached to the first carbon, and since carbon always makes four bonds, you must assume that it is making a double bond to its neighboring carbon. This is confirmed by looking at the second carbon. It is attached to a carbon, a hydrogen, and an alcohol group. Since it needs to make four bonds, there must be a double bond involved. Answer e is wrong because it contains an amine, not an alcohol....
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