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ChemistryOrganic Chemistry

What Is Orgo? Classify Addition, Elimination, and Substitution Reactions

Orgo is the campus shorthand for organic chemistry. Classify three textbook reactions as addition, elimination, or substitution by counting the species and tracking sigma and pi bond changes.

Question

Classify each of the following reactions as an addition, elimination, substitution, or rearrangement:

(a) CH3Br+KOH→CH3OH+KBr\mathrm{CH_3Br + KOH \rightarrow CH_3OH + KBr}

(b) CH3CH2Br→H2C=CH2+HBr\mathrm{CH_3CH_2Br \rightarrow H_2C{=}CH_2 + HBr}

(c) H2C=CH2+H2→CH3CH3\mathrm{H_2C{=}CH_2 + H_2 \rightarrow CH_3CH_3}

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Evidence boundary

This page treats OpenStax Organic Chemistry Problem 6-1 as a complete representative exercise for the course shorthand “orgo.” Orgo is an informal name for organic chemistry, and the page does not claim the search phrase corresponds to one specific original exam item. The three equations and their order are taken from that textbook problem without adding or removing any part. Classification here follows structural change only; no mechanism, rate, yield, or stereochemical conclusion is drawn.