This is a problem-solving reprise, not new content — it teaches students how to think across the Orgo 1 reactions rather than memorize them in isolation. The organizing tool is the functional-group interconversion map: a mental (or drawn) network showing which functional group can be turned into which, and by what reagent.

The core habit is retrosynthesis — working backward from the target. Instead of asking "what does this reagent do?", ask "what could have made this group, and one step before that, what made that?" Each backward step is a disconnection, and the fragment you work back to is a synthon/precursor. Students should practice drawing the retrosynthetic arrow (⇒) and naming the forward reagent for each step.

The Orgo 1 roadmap hubs students should be able to navigate by this point:

Alkenes as the central hub. Alkenes are made by elimination (E1/E2) from alkyl halides or by dehydration of alcohols, and they convert into a huge range of products by addition: Markovnikov hydration (acid or oxymercuration) → alcohols; anti-Markovnikov hydroboration-oxidation → alcohols; hydrohalogenation → alkyl halides; halogenation → vicinal dihalides; halohydrin formation; hydrogenation → alkanes; and oxidative cleavage (ozonolysis) → carbonyls.
Alkyl halides as the substitution/elimination crossroads. They interconvert with alcohols, ethers, alkenes, and (via SN2 with the right nucleophiles) many other groups.
Alcohols as a second hub. They come from alkene hydration or substitution and lead to alkenes (dehydration), alkyl halides, and carbonyls (oxidation).
Alkynes as a source of nucleophilic carbon: terminal alkyne deprotonation → acetylide → SN2 alkylation is the key C–C bond-forming reaction of Orgo 1, letting students build the carbon skeleton, not just decorate it.

The strategic points this reprise should drill: (1) always decide whether a step changes the carbon skeleton or only the functional group; (2) track regiochemistry (Markovnikov vs. anti-Markovnikov, Zaitsev vs. Hofmann) and stereochemistry (syn vs. anti addition, inversion in SN2) at every step, because a "correct" connectivity with the wrong stereochemistry is still wrong; and (3) recognize that most multi-step problems route through an alkene or an alcohol.

"Map the Route"