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How bad is 1% solution of HF? I was helping my mom clean the driveway rust stains, using some "weak" chemicals, when our neighbor walked over and offered to help. He brought over this nice rust remover poured on the driveway rust stains and it worked very well. So I looked at the list of active ingredients and my jaw dropped. Active ingredients are oxalic acid and hydrogen fluoride. Looking at actual msds sheet it says less that 1% concentration, but still surprised to see HF in $10/gal solution available at Wal-Mart.  No spills happened, no exposure or any other oopsies, but I am just curious how bad can it be... I bought 3 gallons of that same cleaner to finish driveway cleaning next week. Usually I'd not use things this bad unless I need to, so might still go with HCl instead of this cleaner. Just curious how careful should I be with 1% solution.  Goof off rust stain remover is the actual product if anyone wants to look up msds. It basically states HF <1% and oxalic acid  <10%.

What electrophile are you using? I have alkylated malonate with a triflate an got 100% O-alkylation, I think a softer electrophile like alkyliodide is better. If you want lithium you can use LDA.

Such a record is not yet Lewis structure. This is the semi-structural chemical formula.

H₃C-CH₂-CH₃ and
CH₃-CH₂-CH₃ are exactly the same formulas

One note on terminology: "CH3" is a methyl group, and not methane. Carbon makes 4 bonds, so CH3 is not a stand alone molecule, but rather a substituent/group that must be bonded to another carbon. Methyl is an alkyl group, and such groups end in "-yl". Alkanes are stable molecules where all the carbons make four bonds, and their names and in -ane. For example CH4 is methane.

Also, "methyl" doesn't really mean just one carbon. It literally means CH3. CH2 and CH have other names, but its probably best not to get too bogged down in terminology and focus on the concepts also.

(CH3)3C is also not a complete molecule, because the central carbon is only making three bonds. It is called a "tert-butyl" group. This article about isomers and terminology might be helpful: https://www.masterorganicchemistry.com/2011/11/10/dont-be-futyl-learn-the-butyls/