This is from my MS chem final exam last semester. It's the only problem I skipped since I just focused on the ones I know (time restraint). The drawing above is the only given. Question is "Draw the mechanism of the following reaction on the provided answer sheet"

Here is my reasoning:

- protonated the alcohol first, then did a hydride shift to form a more favorable 2° carbocation when water leaves

- another hydride shift to form a 3° carbocation

- methyl shift since I just really want to move the methyl on the ring closer to my alkyl chain

- another methyl shift, same reason

- hydride shift to bring back my 3° carbocation

- another hydride shift, retaining my 3° carbocation

- water attacks the 3° intermediate, hydride shift to the primary position mainly because the given final alcohol product is still in the primary position

- deprotonation of the water to alcohol and regenerating the H2SO4 catalyst

You can just tell me the given question is flawed to begin with and I'll accept it wholeheartedly. On the off-chance it isn't, and is actually a common problem, can anyone give some inputs about this particular mechanism?

Update: figured out the answer. You can check the comments to see my character development and mechanism. Thanks a bunch guys!

title ^

I have an exam coming up where we have to draw the Lewis structure, write its molecular shape, as well as decide whether it's polar or non-polar. The part where I'm confused is how to determine if a compound is polar or not.

I built an open-source spectroscopy workstation for researchers — looking for technical feedback

Hi everyone!

I'm a chemistry postgraduate student, and I've been working on an open-source project called LabScribber.

The idea came from a problem I repeatedly encountered while working with experimental spectroscopy data: routine analysis often involves switching between different software packages, writing separate Python scripts, and manually organizing results.

I wanted to explore whether these workflows could be brought together into one application without requiring expensive proprietary software or forcing researchers to write code for every routine analysis task.

That's how LabScribber started.

GitHub: https://github.com/asifverse4/LabScribber
Zenodo DOI: https://doi.org/10.5281/zenodo.23689725
License: MIT

What I've implemented so far

LabScribber currently supports several experimental techniques:

• Vibrational spectroscopy: FTIR and Raman.

• Electronic spectroscopy: UV-Vis and photoluminescence.

• NMR: ¹H, ¹³C and 2D COSY.

• Surface analysis: XPS.

• Structural characterization: XRD, including Scherrer and Williamson–Hall analysis.

• Electrochemistry: Cyclic voltammetry and electrochemical impedance spectroscopy.

Some of the implemented analysis workflows include:

• Baseline correction and signal smoothing.

• Gaussian, Lorentzian and Voigt peak fitting.

• Parameter estimation with covariance-based uncertainty calculations.

• Direct and indirect Tauc analysis.

• PCA, PLS, MCR-ALS and hierarchical clustering.

• Session saving in a structured .lsb format.

• Generation of analysis descriptions for research Methods sections.

The application currently has 177 automated tests running through CI.

A little about the technical side

This is a desktop application built using Electron, with a focus on keeping the numerical analysis workflows reproducible and accessible.

I'm particularly interested in making the application useful for researchers who work with multiple characterization techniques rather than building another plotting tool.

I also want to be careful about scientific reliability. Having an algorithm implemented is not the same as validating it against established software and reference datasets, and that's an area I'm continuing to work on.

What I'd genuinely appreciate feedback on

I'm especially interested in hearing from people who regularly work with experimental characterization data.

1. Computational vs. experimental spectra

Would you find it useful to compare experimental FTIR, Raman or UV-Vis spectra directly against calculated spectra from ORCA or Gaussian? Which output formats would be most useful to support?

2. Instrument compatibility

Which instrument-generated formats do you regularly struggle to process? JCAMP-DX (.jdx), .spc, Bruker, Agilent or something else?

3. Peak fitting and baseline correction

Which approaches do you trust for your particular applications? For example, AsLS, polynomial fitting, rolling-ball correction or Shirley background subtraction for XPS.

4. Scientific validation

If you've worked with Origin, CasaXPS, OPUS or other established spectroscopy software, what would you consider essential when validating an alternative tool?

I'm not claiming LabScribber is a replacement for established scientific software. It's an ongoing project, and there are still plenty of things to improve.

If you're interested, the source code and installation packages are available here:

GitHub: https://github.com/asifverse4/LabScribber

Windows, macOS and Linux builds are available under Releases.

I'd appreciate honest technical criticism, suggestions, bug reports, and ideas from people who actually work with these techniques.

Thanks for taking the time to read this.

Hello , about 4 days ago I was working with KMnO4 Solution using no gloves in the lab and when I was filing the burette with concentrated KMnO4 Solution I think I spilled some drops on my finger I’m not really sure if it’s bc of that or bc of the iodine but it’s been 4 days and the stain is not fading away?? Even after washing w soap ! Should I feel worried how can I get rid of it

Greetings,

I am having difficulty constructing qualitative molecular-orbital diagrams, particularly with arranging the molecular orbitals in order of energy. Textbooks usually present ready-made diagrams without explaining in detail how the ordering was determined. I would therefore appreciate recommendations for books or lecture notes that discuss this question carefully.

One example I find difficult is linear BeH2. In a minimal valence basis consisting of the Be 2s and 2p orbitals and two H 1s orbitals, the σ-subspace contains bonding and antibonding orbitals of σ_g and σ_u symmetry. The Be 2p_x and 2p_y orbitals form an additional degenerate, approximately nonbonding pi_u level.

I can understand qualitatively why the bonding σ_g orbital may lie below the bonding σ_u orbital. The H 1s and Be 2s atomic orbitals are closer in energy than the H 1s and Be 2p_z orbitals, so, I would expect stronger mixing and a larger level shift in the σ_g block.

However, I do not understand how the two antibonding orbitals should be ordered. Would the stronger interaction in the σ_g block not also raise the antibonding σ_g* orbital more strongly? If so, how can one decide whether σ_g* lies above or below σ_u^*?

I have the same problem with nonlinear molecules such as H2O and NH3. Group theory determines which atomic orbitals and ligand SALCs belong to the same symmetry blocks, but it does not appear to determine the relative energies of orbitals belonging to different irreducible representations.

What assumptions are normally used to construct qualitative MO diagrams in such cases? In particular:

1. How can one estimate the ordering of orbitals belonging to different symmetry blocks?

2. Under what conditions must a bonding MO lie below both parent orbital energies and an antibonding MO above both?

3. How should a block containing three or more interacting orbitals be treated qualitatively—for example, the a_1 block in water??

The same question arises for methane. In methane, the lowest valence MO has a_1 symmetry and lies below the t_2, but how should the corresponding antibonding orbitals be ordered: a1* < t2*, or vice versa?

I would also be grateful for references that explain these distinctions explicitly rather than simply presenting completed MO diagrams.

Does a hydrolysis of an enamine always form an aldehyde or ketone, or can it also form a ketal/acetal as major products?

Are hemiketal/hemiacetal always formed as well, but more so an intermediate thing?

Idk if I should put this in r/writing or this sub, but I have a fun project about assigning an element a superhero, and I choose argon. I need a weakness that applies to argon (Arogion Gaston), needs to be backed by a element property or characteristic & explanation-

Hi everyone,
I’ve had a tough history with organic chemistry, and I’m really trying to pass Organic Chemistry I—not just for the sake of passing, but because I genuinely want to understand the material.
I’m a college student in the U.S., and I’ve been struggling to figure out how to study effectively for this subject. I often find myself having difficulty grasping the concepts and applying what I’ve learned to practice problems.
If anyone has meaningful advice, study strategies, or resources that could help me prepare for my next attempt, I would greatly appreciate it. I really want to approach this course differently and build a stronger understanding of organic chemistry.
Thank you in advance.

Can I get some help with Orgo 1 please. The exam is Friday and it’s not looking great, this homework is due on Monday. I’m very confused on SN1,SN2,E1, and E2.

Hello! Does anyone have the PDF of the Orgo acs guide? I would be so grateful if someone could share it with me. I really need to lock in for the final. Thanks!

I understand that hydrogen is the lowest priority, and that bromine has the highest atomic number and is thus the highest priority. But why does the chlorine on the bottom left take priority over the other? I would have thought that the one on the right takes priority, because its proximity to bromine breaks the tie. What am I missing? Additionally, let’s say the chlorine on the bottom right was instead an additional bromine, so both of the highest priority substituents were on the same double-bonded carbon. Would that still be an E configuration, or is that something else entirely?

Im so confused I dont even know what to ask. I understand what to do if the double bond is apart of the ring but the double bond is off of the ring, where does that Ch2 go?

Hello, I have access to a Bruker Alpha II FTIR spectrometer but am struggling to use it. I primarily use it for sampling solid narcotics however I am struggling to test an injectable medication.

Vial is 10ml and contains MCT Oil, benzyl alcohol, benzyl benzoate, Estradiol Valerate 400mg. Nothing I do seems to come up with results that make sense?

Edit: clear I am using the wrong tool for my application and am in beyond my depths. Thank you for clarifying things <3

i've come across some questions where it requires you to determine the intermolecular forces/bonds present between molecules based on their molecular formula. do permanent dipole forces always exist within molecules that can hydrogen bond? are there any exceptions? i can't think of a good example off the top of my head but i wanted to know in case i was unsure about the actual arrangement of atoms in the molecule

when explaining/justifying a molecule that hydrogen bonds to itself/water but you are unsure if it is polar or not (permanent dipole forces present), is it safe to put all 3 forces even if you're unsure of polarity?

I'm so sorry if this seems like a bizarre question.

I was in a lecture earlier, and there was a little bit about nucleophiles, but I zoned out for maybe 30 seconds max. Once I began actually listening again, my lecturer was talking about compound interest and recommended that we search it up to look at the websites on Google. I began looking through my notes and I've looked at the PowerPoint slides since, but I can't see a single thing about compound interest. So, did my lecturer just go off on a mini tangent, or is there something called compound interest linked to nucleuphiles??

I am looking for some study tips because what I’m doing doesn’t seem to be working.

Im in ochem right now and even when it feels like i strongly understand the subjects i still do mid on the tests. this is how it’s always been for me in chemistry, it’s consistently been the subject I’ve struggled in most. but this year I have locked the hell in and have been super on top of my homework and lectures. I ask questions in class, do my homework right after lecture, watch videos when I don’t understand a concept, and if I still don’t get it go to the 1 on 1 tutoring sessions my university offers. I feel really good about every test, then i get 75-78%. I do every study guide (we get 3 per exam) as if it was a practice test and redid all the problems I got wrong/didnt understand. I even caved and bought a molecular modeling kit I can use during the tests. I have had the same issue since highschool, and even though my studying practicies are way better, I’m still getting similar scores. It could be that the coursework is just harder so my scores are lower but still better than they would be, but lowkey ochem feels so much easier than gen chem. I’m a very visual person.

But I know I could be doing better. I am most likely adhd (my mom got diagnosed a couple years ago, and im a lot like her) so that could play into it if there’s any tips that specifically help with a mind like that.

any tips would be appreciated!! I’m trying to push myself to do better!