r/chemhelp

Hi Folks,

This was a question from our last exam, which I got correct but I was close to selecting letter A.

Here is my thinking:
The lone pairs on B and D are not contributing to aromaticity and are therefore free to act as a source of electrons, this makes them more basic so we can eliminate these two options. Same situation for option A I guess, right?

The lone pair on C is contributing to aromaticity on this molecule, and is less available as a source of electrons (less available to act as a base).

What if we compared A to C and asked which is more acidic? Would C be more acidic because the conjugate base has resonance stabilization and option A does not?

Okay, thanks for your help!

I’m very confused where the bond disconnections are I know it’s between N - H and C = 0 bonds but that’s only 2 and I have 4 fragments to find where’s the other ones in these Qs

So I came across this question and I think that question is incorrect, I’ve attached my solutions too, please help me !!!

I am doing my summer work to go into AP Chemistry

I don’t want help with the problems and I already emailed my teachers about this but they are on summer break - where do I genuinely put my work to do the problem especially problems such as 9. as someone with large handwriting who shows a lot of work to avoid making mistakes. Should I attach a scrap paper and do my work there?

These two molecules baffle me. I can't tell where the hydrogens are pointing and what the orders of priority are.

Appreciate your help ⭐

Edit : My initial answers are S,S for both the molecules but the the book says otherwise so I kinda suspect if I get the orders of priority wrong here. I'm quite convinced that the hydrogens are pointing backwards

I use a retainer cleaner and when it makes contact with clothes, it discolors them with a brownish-like color reminiscent of a circle with its inner area being dark brown and the outer circle being lighter. The following chemicals that are in the retainer cleaner are in the image above

Which chemical/s are most likely to have caused this discoloration above? Asking for curiosity purposes. Also, is there a way to reverse the discoloration, preferably through affordable means? Thank you!

Not entirely sure of the last component I need to include with this problem. I know retrosynth-wise I'll do a Grignard and then a Diels, but I feel like I'm missing something. Can anybody help me with the steps? I don't need to draw the mechanism, but do need to have steps and intermediates. Many thanks.

Can somebody please explain how to do this in a simple way that makes sense?

I've really been trying to study for chem but I feel like I havent improved. What I do is read the textbook, then watch the lecture and attempt the questions but I still don't understand it. My main issue is that even though read the text and watch the lectures, I always forget some concept when trying a problem, leading me to not know how to start. I spend at least 4 hours every day studying for chem so its not the time that I doing wrong, its HOW im spending it is wrong but whenever I try to fix it, I don't see any improvement. Im worried that I'll fail this summer class. I really need advice on what to do. This is an example of the issue im having:

So in the example problem, I paused the video and attempted to do the problem. Since finding pH and were given titration and Molarity as well as Ka, i thought that we would just plug everything into the Henderson formula and get the pH (of course we would have to convert Ka to pKa). I did that and I got the answer wrong. I continued the video and saw that we actually had to make an ICE table and also had to recognize some rules regarding titration, which I had no idea about.

I hope someone has advice on what to do. I feel like the concepts don't stick, leading me to not know what to do in questions, making me panic and get them wrong. I feel like I treat it like bio class, which may be the reason why i struggle with it so much.

would this work? and if it doesnt how could i make it work?

Further clarification: this is not my homework, these are merely practice problems, I did not have homework on this stuff, so this is almost foreign. I can also upload pictures of my work if I need to

Does it matter how you draw your arrows when using curved arrows for resonance? For example, in this problem, I started the tails of my arrows in different places from the textbook's answer. Does either way suffice, or is it more "stable" or realistic to use the textbook's answer and why? Should you always choose the shortest path for arrows?

i'm not sure if i misunderstand regioselective, but i think of it as a reaction producing multiple constitutional isomers with a major/minor product

however, the answer key says that because multiple acetonides can form, the reaction is neither regioselective or stereoselective.

isn't a defining part of regioselectivity having two products that are constitutional isomers?

(image 2 for acetonide group the question provided)

My professor assigned additional problems to our lecture and I am completely stuck! His instructions were to “Use any resources needed to fill out the synthesis below. Any 3-carbon molecule may be used. Protecting groups may be necessary/included.” To begin I put my cut at C-N. Following that I identified the heteroatom as being two carbons away, meaning an epoxide was needed. I chose my three carbon material to be propylamine. Thus far is this correct? The trouble I was running into was forming the epoxide. Since there is no double bond present MCPBA isn’t an option at this point and Br2/H20 would add an additional alcohol to the already present OH. I have no idea where to go from here any help is appreciated!

Are these the two isoprene’s

Hi all, it’s been a few years since I’ve taken Orgo 1 and I’m doing a review assignment. Would someone mind walking me through the mechanism for this reaction?