The Periodic Table

JavaScriptCoder

00:16

@M.A.R. what do you mean “don’t even know”? You don’t know me, and most likely you don’t know someone like Martin irl, but you’ve probably seen some of our answer reviews...

Bounty Hunter

4

Q: Determining overtones bands of degenerate modes

I have a question of a more mathematical nature on the mathSE (Symmetric Direct Product Distributive?), but it hasn't gotten much attention. I think the chemical context might make for a better answer here. I'm trying to determine the symmetry of the second overtone band of the degenerate $\...

M.A.R.

01:11

@JavaScriptCoder are you considering being familiar with someone's online persona to be nothing? I don't.

There's certainly a difference between someone I've said a hi to, someone I've chatted with for couple of years, and someone whose username I haven't gotten to pronounce.

Secret

03:19

@Abcd No you cannot, cause the question have instructed us to assume 100% dissociation of the salt species

even though if this is not a question, but a real life scenario, that factor will be important in the equlibrium

Gaurang Tandon

03:52

@M.A.R. these first posters frequently offer very insightful responses about the most fundamental particles of our universe, enough to turn the world's working upside down; who knows one day one of their magnificent insights might win them the Nobel prize? ;P

Gaurang Tandon

04:21

anyone knows what kind of "addition reactions" cyclopropane can undergo?

(MS Chouhan; Advanced Problems In Organic Chemistry; 11th ed; Q31 in Alkanes chapter)

i mean, it seems easy but I don't have a clue

MollyCooL

@GaurangTandon Although i dont have much idea about it, my book says it undergoes Electrophillic addition, more specifically ring opening addition reactions

Gaurang Tandon

@MollyCooL does it give examples of a specific reagent?

like grignard or anything?

MollyCooL

hydrogen halide

HBr HCl

Gaurang Tandon

interesting...so cyclopropane + HCl -> 1-chloropropane?

MollyCooL

It also says, “ Due to ring strain in cyclopropane it is more reactuve towards addition of these two and less reactive towards Br2 and Cl2

Yes

Gaurang Tandon

04:33

which book?

MollyCooL

KS verma, Org Chem for JEE adv part 1

And i didnt even start learning anything in organic chem :(

Gaurang Tandon

nvm I don't own it; does it give a mechanism?

please send me a photo if you can? (and if you are on mobile)

MollyCooL

Yes Bromination mechanism

Wait

Nvm

I ll check if thats the mechanism gimme a minute

Gaurang Tandon

yep sure

MollyCooL

Theres a mechanism given for dimethyl cyclopropane

Gaurang Tandon

04:41

please share a photo if you can :)

MollyCooL

on ipad :(

idk wheres the option to click a pic and share

Gaurang Tandon

there's an upload button on the chatpage next to the textbox

MollyCooL

Nope only a send button

Is visible for me

Gaurang Tandon

oh :/ can you upload the image once you get on your pc? i will wait

MollyCooL

I ll try gettin on mobile

Even on mobile theres no such option :(

Gaurang Tandon

04:55

:(

Avnish Kabaj

@MollyCooL upload it as a random answer, copy the link and paste it here

Gaurang Tandon

or use postimages.org @MollyCooL

MollyCooL

Is that allowed lol

Okay

Avnish Kabaj

Or if you are on chrome tap on the three dots top right corner and request for the desktop site

MollyCooL

postimg.org/image/bve1ypmbh

Avnish Kabaj

04:59

Yeah that works

Gaurang Tandon

@MollyCooL thanks looking :)

MollyCooL

👍👍👍

Gaurang Tandon

does it have more examples there?

@MollyCooL ---^ ?

MollyCooL

More example of? @GaurangTandon

Gaurang Tandon

@MollyCooL of addition of a reagent to a cycloalkane ring

MollyCooL

05:11

Yes

Gaurang Tandon

then please share :)

MollyCooL

Same ringopening addition with Br2 and one mechanism stating bromination. Will send

postimg.org/image/nn1x91r31

Gaurang Tandon

woah thanks so much that's awesome :D

MollyCooL

06:13

No worries

Gaurang Tandon

07:58

@anyone owning MS Chouhan; Advanced Problems In Organic Chemistry; please see Q14 alkenes chapter; where we are to count number of transition states and intermediates

I think the answer should be 3TS and 2Intermed

but it's marked without reason

Abcd

08:38

@AvnishKabaj it doesnt, i use laptop

Avnish Kabaj

@Abcd arggggghhhhh

Siddharth Venu

09:24

anyone active?

i have a quick question

Gaurang Tandon

just post

@anyone owning MS Chouhan; Advanced Problems In Organic Chemistry; do you know the mechanism of q26 alkenes chapter? solution seems awkward. thanks!

addition of cold HF to ethene and isobutane

Gaurang Tandon

10:22

Just replace $\ce{NaOH}$ with hot $\ce{H2O2}$ and you'll get the same cleavage $\ce{-COOH}$ reaction. That's the closest thing to a mechanism I found in sn sanyal. — Avnish Kabaj 47 secs ago

@AvnishKabaj what page number? (i've the book too)

Avnish Kabaj

10:41

@GaurangTandon it's not there can't find it I was looking for the same mechanism eons ago

Gaurang Tandon

duh

Gaurang Tandon

11:13

@MollyCooL You can and should enclose the numbers inside \pu as well, it gives a nice spacing ;) (wrt your latest edit)

@Abcd It isn't recommended to edit "hopeless questions" (wrt the ICl4- question) unless and until the OP posts some effort on his part; these hopeless questions almost always get closed within 2 days, and are deleted on the thirtieth day, making your valuable edit worthless

Avnish Kabaj

11:31

@GaurangTandon Strong sense of Deja Vu. Did you just copy paste the exact line Martin used for me

Gaurang Tandon

@AvnishKabaj i definitely don't recall when Martin said this to me or you; he might have said this, I might have read it, i may very well be almost quoting him, but i don't recall, so... (sorry for spoiling your anticipations hehe :P)

1,3-feeds

0

Q: Organic oxidation and reductions tag

I cannot find an earlier discussion pertaining to this tag, so I'll post this today. I've noticed the organic-reduction for a fair amount of time now. It has 14 questions tagged as of today. However, I cannot find the pertinent meta post about its creation. This is the only meta post relevant to...

discussion tags

MollyCooL

Sure @GaurangTandon

will use

Too many organic questions today and im like oh :/

Gaurang Tandon

12:29

@1,3-feeds @M.A.R. I heard you wanted me to make another meta post, so here it is ;)

@MollyCooL haha, I've been entirely studying MS Chouhan; Advanced Problems In Organic Chemistry today :P

M.A.R.

12:46

@GaurangTandon throws up

MollyCooL

13:06

@GaurangTandon Nice, I have been with the idea of starting organic but my mind goes all blank when I open that book of K.S Verma

Gaurang Tandon

@MollyCooL oh, I just posted another one for you ;)

@MollyCooL you've just started with class 12?

MollyCooL

13:41

12th starts from march 16 @GaurangTandon

Gaurang Tandon

@MollyCooL cool; bulk of o-chem is in class 12th actually, so don't worry :)

@AvnishKabaj you may want to remove that quote from wikipedia in your answer; it is entirely irrelevant to the main point

MollyCooL

Yes and in Class 11 i know only ncert level organic :(

@GaurangTandon dont you have yor boards now?

Gaurang Tandon

@MollyCooL they're over

MollyCooL

Oh nice! Next is Mains uh?

Gaurang Tandon

@MollyCooL yeah :) three weeks to go...

MollyCooL

13:48

All the very best!

Gaurang Tandon

thanks :)

MollyCooL

Im worried already that im gonna suck so bad in those exams :/ especially in physics

Gaurang Tandon

@MollyCooL your class 11th exams?

they're already over I guess?

MollyCooL

14:05

Yes got over by march 2

Gaurang Tandon

don't worry about them, as long as you know the concepts, noone cares of your marks in internals

Zhe

@GaurangTandon You're killing me with these edits of old posts

Avnish Kabaj

@GaurangTandon I went through your question clicked on all the links. I sort of realized that you mist have already figured all the stuff in my answer out . You're looking for a yes/no from a chemist right? I'm deleting my answer it doesn't add anything to the question

Gaurang Tandon

@Zhe i've almost stopped since yesterday? the posts I am editing are the ones that come up in my google searches

like I was reading up hsab theory yesternight

Zhe

@GaurangTandon k

Gaurang Tandon

14:06

and reading substituted alkenes today

MollyCooL

Nah! I said im worried bout mains and adv lol. @GaurangTandon

Gaurang Tandon

chem.se material is so good it almost always pops in all my google searches

@MollyCooL you still have an year, no worries ^_^

@AvnishKabaj i was talking about the latest answer, alkenes one

the first quote from wikipedia is irrelevant

Abcd

@GaurangTandon What to do in case of strong polyprotic bases? Add the OH- produced by all reactions?

Gaurang Tandon

@Abcd do you have any examples of strong polyprotic acids? ;)

Abcd

@GaurangTandon N Avasthi is smarter. He has given a hypothetical strong polyprotic base

Gaurang Tandon

14:10

@Abcd lol; he's wrong just read this post

This is the typical pattern. Roughly speaking, there are no strong polyprotic acids. — Ivan Neretin Feb 23 at 9:59

Abcd

@GaurangTandon roughly speaking

@GaurangTandon Hypothetical, who knows.

2 mins ago, by Abcd

@GaurangTandon What to do in case of strong polyprotic bases? Add the OH- produced by all reactions?

@GaurangTandon This is the point to focus on

Should I add?

Avnish Kabaj

@GaurangTandon me2

Abcd

@AvnishKabaj Any thoughts on this?

Avnish Kabaj

@Abcd it's a pretty long derivation I found it in Bruce H Mahan

Gaurang Tandon

@AvnishKabaj your latest answer is actually good, and I think it's completely accurate; just the first part seems irrelevant to me

Avnish Kabaj

14:15

@GaurangTandon Chalo ok

Abcd

@AvnishKabaj ... What do you mean? Which derivation?

Gaurang Tandon

@Abcd well by a polyprotic base do you mean something like Mg(OH)2?

Abcd

@GaurangTandon $\ce{X(OH)_3}$, polyacidic base sorry

Gaurang Tandon

duh, you'd confused me there; well you may consider the reaction to be like this
X(OH)3 -> X^3+ + 3OH^-

though I wonder if such bases exist

getting it?

Abcd

@GaurangTandon nah, Kdissociation 1, Kdissociation 2 .are given

Gaurang Tandon

14:18

@AvnishKabaj eh, i had asked you to delete only the first irrelevant part, and not the whole answer, the second part was correct as I already said facepalm

Abcd

@AvnishKabaj Humble request to tell the thing you are speaking of, clearly. I don't get it most of the times

Gaurang Tandon

@Abcd then do similar to what you would do to calculate concentration of various species in aqueous H3PO4; you must be having one such example in your fiitjee question bank

Avnish Kabaj

@Abcd 5

Abcd

@GaurangTandon Let me share the question w/ you.

@AvnishKabaj Again!

Avnish Kabaj

@Abcd no idea as of now still have to revise.

But of I remember correctly

Half of both the pkas

MollyCooL

14:22

@any1 what is the question!?

Abcd

@GaurangTandon If first dissociation of $\ce{XOH3}$ is $100 \%$ where as second dissociation is $50 \%$ and third dissociation is negligeble then pH of $4\times 10^{-3}\pu{M}$ $\ce{X(OH)3}$ is ?

Avnish Kabaj

@GaurangTandon undeleted . Do whatever you want to I'll take a look later on

@MollyCooL 5

Abcd

@AvnishKabaj WHAT 5????

MollyCooL

Wdym by 5?

Abcd

Yeah @GaurangTandon we are supposed to add

I get the right answer using that..

Gaurang Tandon

14:24

@AvnishKabaj looks much neater to me now ^_^ what do you say?

@Abcd how did you conclude that this is a strong polyacidic base -_- ????

clearly third dissoc is neglected

Abcd

@GaurangTandon $\ce{H2SO4}$ is strong as well.

Despite Ka2 being less

Gaurang Tandon

@Abcd it is always given in the question that it is strong, right?

Abcd

@GaurangTandon no

Ka datas are given

Avnish Kabaj

@GaurangTandon yep. Sifting information is a pretty useful skill

Gaurang Tandon

@AvnishKabaj great

@Abcd please allow me to give up

MollyCooL

14:31

What is the answer that is given?

@Abcd

Suddenly everyone is silent -_-

Gaurang Tandon

anyone knows the "M rule of stability"? that rule supposedly explains why vic-diiodopropane is unstable...

did any of you find this in March/KSVerma/Claygen/etc?

Avnish Kabaj

@GaurangTandon can you write the IUPAC name

Gaurang Tandon

@AvnishKabaj 1,2-diiodopropane

Abcd

@MollyCooL 11.78

Gaurang Tandon

no, I am sorry, the "M rule" explains the addition of HI to 3-iodo-propene to form 1,2-diiodopropane

ohhhhh arrghhh!

it's markovnikoff rule

i feel absolutely stupid now -_-

Avnish Kabaj

14:47

Lulz

Gaurang Tandon

but still, why is 1,2-diiodopropane unstable?

idk the reason

any clues in March/KSVerma/Claygen/etc

?

???

MollyCooL

Even i got 11.78 @Abcd

I was thinking what M rule were you talkin bout :P

Gaurang Tandon

15:09

@MollyCooL hehe :P

M.A.R.

15:42

@GaurangTandon material is not even half of it

The hell? Who calls Markonikov the M rule?

That's just stupid. And lazy.

Stuzy

Laztupid

Gaurang Tandon

@M.A.R. definitely, you won't believe me for how long this kept me confused

i wonder if this would be a good question for puzzling.se xD

Gaurang Tandon

16:08

6

A: Resources for learning Chemistry

Software ChemOffice Professional Commercial software for drawing molecular structures, 3D models and many more. High price but most higher education institutes will provide students/staff with free institutional licenses. MarvinSketch Freeware (closed-source) for drawing molecular structures wi...

does anyone realize this is missing the most popular ChemDraw for ages now?

i don't know enough about it to add it in myself

Loong