The Periodic Table

12:44 AM

chemistry.stackexchange.com/review/suggested-edits/79481

could any organic chemist check this suggested edit and see if it is correct? --^ i'll likely avoid approving edits that change the core of the answer in such radical manner

Anonymous

2:55 AM

@Martin-マーチン @abcd google.co.in/url?sa=t&source=web&rct=j&url=https://…

Abcd

Anonymous

Yeah, shared for the same.

Anonymous

Huckels rule is derived from like how many electrons go in bonding molecular orbital and how many electrons go in antibonding. And on the basis of which one is greater, stability is known? So, why can't we apply the same for inorganic ones?

Gaurang Tandon

4:55 AM

I mistook SE site as a homework site for a moment

2

Q: Given coordinates of center, equation of tangent to a circle, what is their point of contact?

A circle centre $(-6,3)$ has a tangent with equation $$3X + 2Y = 40$$ What are the coordinates of the point of contact of the tangent with the circle?

geometry

6

Q: Area of triangle

A triangle is inscribed in a circle. The vertices of triangle divide the circle into three arcs of length 3, 4 and 5 units, then find the area of triangle.

geometry triangle area

interesting

236 views and a net of 13 votes on the parent post?!

13

Q: Are we happy with the Q&A books?

Editorial note: Voting will be open until the end of next weekend (29 April), at which point we will make a decision based on the usual number of upvotes criterion. In light of the "unearthing" (or re-unearthing) of the Q&A e-books, I'd like us to consider as a community whether we are conte...

discussion featured

doesn't even follow Parreto's principle

arrggghhh

Martin - マーチン

7:24 AM

@DivyankaChaudhari Counting rules are an oversimplification. This one only works well for the cases where you actually have degenerate orbitals and orbital contributions are equal among the participating atoms (i.e. a reasonably high symmetry). If that does not apply any more, you'll have a special case and that means that these counting rules need to be modified.

You should rather focus on why these rules work for the cases for simple monocyclic hydrocarbons, and the underlying explanations, then you don't need to rely on an arbitrary number. And don't treat aromaticity as some property; it is only a word for an ideal bonding situation and a certain reactivity.

s. patroller

8:11 AM

In short: not everything that counts can be counted :P

Anonymous

8:29 AM

Got it. I thought a little on that what my capacity allows.

Nehal Samee

10:54 AM

@Zhe But if $\alpha$ is the degree of dissociation , then wouldn't it be $a-a\alpha$ for PCl5 ... ? Your line will be correct if I say $\alpha mole is dissociated in equilibrium ...?

Zhe

11:52 AM

@NehalSamee Ah, sorry, bad reading.

Then just replace $x$ with $\alpha$

1,3-feeds

12:26 PM

0

Q: What is "User cannot suggest edits to this questions"?

I recently came across a poorly written question and thought of suggesting some edits to correct some spellings, mathjax and format it for a better look. But, after I was completed and clicked on suggest edits, this is what I came across: Couldn't understand what and why this was? Any help w...

support suggested-edits

Bounty Hunter

2:07 PM

1

Q: Why do chromyl bromide and chromyl iodide not exist?

It is known that chromyl chloride exists (popularly known as the product of a test for presence of chloride ion) but chromyl bromide and chromyl iodide are unknown. Why is it so? Why don't they exist? I'd guess it has something to do with the large size of bromine and iodine compared to chlorine...

inorganic-chemistry stability

Abcd

2:44 PM

1

A: Nitrosonium ion in the nitration of phenols

Possibly the electrophile is molecular $\ce{HNO3}$. Nitric acid is strong but not super-strong ($\mathrm{p}K_\mathrm{a} = -1.3$), so solutions on the order of a mole per liter have a significant amount of molecular $\ce{HNO3}$. As $\ce{NO2(OH)}$ this can transfer its nitryl ($\ce{NO2+}$) ion moie...

This doesn't directly or indirectly answer his question. Why was my not an answer flag declined?

@GaurangTandon nice to see you generously open so many bounties these days.

Gaurang Tandon

3:43 PM

@Abcd well most of my janitorial duties are well carried out by being above 3.1k-rep, and I really don't see a point in having excess rep beyond what I require, especially when there's such decent questions left unanswered. So, yeah, I like putting bounties :-)

@Abcd NAA flag is only for the extreme cases. This may be a vague attempt at answering the question. So, in such cases, it's better to downvote and leave a comment instead of flagging for straightway deletion.

Abcd

@GaurangTandon Put bounties on some of my good questions too please :P

Gaurang Tandon

@Abcd hehe :P tbh, though, I was really humbled by the fantastic answers my previous bounty got. Especially the one by Matthew.

Abcd

@GaurangTandon What is their alternative to back bonding? for instance $\ce{p_{\pi} - d_{\pi}}$ back bonding

Gaurang Tandon

I'm sure Chem.se ochemists are not against back bonding

They are just against the excitable d orbitals

Abcd

@GaurangTandon They are not against p pi d pi backbonding?

Gaurang Tandon