Step up reactions in elementary organic chemistry [closed]








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What are some elementary (high school level) step up reactions? (in which the length of the carbon chain of an organic molecule is increased by one)


**Background:** I was looking for a way to methyl chloride to acetone (spoilers: I still haven't found one :( I could use Wurtz reaction to form ethane from methyl chloride, but I don't know of a way to add one more carbon to this alkane. I found [this question](https://chemistry.stackexchange.com/questions/23840/organic-chemistry-alkanes-step-up-reaction), but it only focuses on the ketene reagent's action on alkanes. I suppose there might be many more such "step up" reagents and their many more compounds which can be "stepped up". Hence, my question.




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PS: A term related to "Step up" is "Step down", which observed in Hunsdiecker reaction and Hoffmann Bromamide reaction.


