Applied to a chemical species, the term expresses a thermodynamic property in reference to a standard, stating that one state is lower in energy than another. The tag should be applied to questions seeking answers with respect to the stability (or instability) of a certain chemical species, ...

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Why doesn't H-O-O-O-O-O-O-O-O-H exist? [duplicate]

The question has its roots in why only carbon mainly shows catenation. I don't see why such a compound cannot be formed. Why don't we have a whole branch dealing with such compounds other than organic ...
0
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1answer
41 views

Stability of Phenoxide Ion

The Phenoxide Ion is more stable than the Phenol itself because more stabilized resonance structures. But on the other hand we say phenoxide ions are more susceptible to electrophilic attack as they ...
1
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1answer
48 views

Nitrogen molecule vs carbon-carbon triple bond stability

Why does the triple bond in the nitrogen molecule convey stability, whereas a triple bond between carbon atoms conveys instability?
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2answers
138 views

Which tautomer of hexane-2,4-dione is more stable?

Which tautomer will be more stable? Both 1 and 2 show intramolecular hydrogen bonding and form 6 membered cyclic ring, thus increasing the stability. I think I need to compare the effect of the ...
1
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1answer
27 views

Is Tollen's test safe?

Tollen's test is an important test to distinguish between aldehyde and ketone. $$\ce{2 [Ag(NH3)2]+ + RCHO + H2O → 2 Ag(s) + 4 NH3 + RCO2H + 2 H+}$$ But is this reaction safe? Is there any threat in ...
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0answers
37 views

What is the order of stability of the following carbocations?

Here's my attempt: So clearly the first 2 are more stable than the last 2 as they involve resonance in ring i.e. the mesomeric effect. Also as the 1st one has a bigger carbon group attached to it ...
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1answer
58 views

Which complexes are stable: ammine complexes or carbonyl complexes?

According to Wikipedia, A spectrochemical series is a list of ligands ordered on ligand strength and a list of metal ions based on oxidation number, group and its identity. $$\ce{I- < ...
6
votes
2answers
86 views

Why Cu+ is unstable in aqueous medium?

This was one of the question that was given in the school exam. But what I am expecting is that $\ce{Cu+}$ attains a $d^{10}$ configuration by losing one electron from s-subshell. Since it has fully ...
4
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1answer
62 views

Order of reactivity of carbonyl compounds towards nucleophilic addition

Arrange the following according to reactivity towards nucleophilic addition reaction: I have already seen this post regarding the reactivity. It helped me to some extent. $\ce{Cl}$ increases ...
7
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1answer
367 views

Why is sulfur hexafluoride highly stable?

I was just reading about p Block elements from two different books. Both books say that $\ce{SF6}$ is extremely stable in 16th group due to steric reasons but my question is why is it more stable than ...
4
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1answer
46 views

Stability of alkenes by hyper conjugation

I have learnt that for carbocations, electrons are delocalized from the $\ce{C-H}$ $\sigma$-bond to the empty p-orbital of carbon. Moreover, alkenes are stabilized by the delocalization of electron ...
6
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3answers
87 views

Why is diene more reactive than alkene?

The chemical reduction of 1,3-butadiene with sodium in alcohol gives mainly the 1,4-addition product that is but-2-ene. Under these condition the isolated double bond are not reduced. This suggest ...
10
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1answer
119 views

Stability of isomers of N4O

I have googled and found that the structure of $\ce{N4O}$ is linear with a positive and negative charge on 2 nitrogen atoms. But, the following structure seems more stable because it fulfils octet for ...
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0answers
15 views

Can there be gaps in autoignition temperatures?

I recently saw a request for solids that auto-ignite between 80C and 160C. I can't find any, and none have yet been suggested. Which leads me to the theoretical question: Is it possible for there to ...
1
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1answer
66 views

Why does Iodine form Cations sometimes?

It is reported that iodine forms compounds like $\ce{(CH3COO)3I}$, $\ce{I(ClO4)3}$ and $\ce{IPO4}$ which contains $\ce{I+}$ and $\ce{I^3+}$ and are not bonded covalently as in interhalogen compounds. ...
3
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1answer
57 views

What is meant by 'stability'?

I'm currently learning about substitution and elimination reactions and to do so I need to learn about bases and nucleophiles. Apparently a good base is an unstable species. What does stability ...
1
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1answer
60 views

Stability of carbocations

We know that if a structure has all equivalent resonance structures, then it will be highly stabilised. So then why benzylic carbocation is more stable than other cyclic allylic carbocations, though ...
2
votes
2answers
726 views

Is iron the most stable element in the periodic table?

According to the binding energy per nucleon vs mass number graph, it is observed that iron-56 has the maximum value of binding energy per nucleon (8.75 MeV).It means that Iron-56 is the most ...
10
votes
1answer
195 views

Stability of carbocations: CF3+ vs CH3+

Is $\ce{CF_3+}$ more stable than $\ce{CH_3+}$? In $\ce{CF_3+}$, there is $\ce{C-F}$ back bonding that increases stability of the carbocations. But -I effect of $\ce{F}$ dominates +R effect and this ...
3
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0answers
50 views

Influence of neighboring fluorine and hydroxyl on carbocation

Which of the 2-fluorobutan-3-yl and butan-2-ol-3-yl carbocations will be more stable? I know that fluorine has a greater electron-withdrawing inductive effect, but what about the resonance effect of ...
0
votes
1answer
49 views

Why are phosphate-phosphate bonds weaker than phosphate-water bonds?

According to the Wikipedia entry on ATP, ATP is an unstable molecule in unbuffered water, in which it hydrolyses to ADP and phosphate. This is because the strength of the bonds between the ...
2
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0answers
21 views

order compounds based of increasing heat of combustion

order compounds based of increasing heat of combustion (least is 1, most is 4) Could someone tell me if my answers are correct? For A) I went off that equatorial bonds are more stable (less ...
6
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1answer
218 views

Why are aromatic compounds so stable?

I've never actually been told deeper reasons for this. In organic chemistry classes (1 and 2) we're usually told that aromatic compounds are very stable whereas anti-aromatic ones are not, and also, ...
3
votes
1answer
309 views

Stability of furanose vs. pyranose form of glucose?

I am trying to imagine the cyclization of the Fischer projection of glucose as it forms an $\unicode[Times]{x3B1}$-D-glucofuranose and an $\unicode[Times]{x3B1}$-D-glucopyranose (right now I am trying ...
3
votes
1answer
39 views

Do hydrogen peroxide stabilizers affect oxidizing ability

I plan to use hydrogen peroxide for a redox reaction in oxidizing $\ce{I-}$ to $\ce{I}$. I found 20 volume hydrogen peroxide as a hair developer, but it contains stabilizer. I imagined these would ...
14
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2answers
552 views

Which of the following is the more stable carbocation?

Which of the following is the more stable carbocation? I thought the 1st carbocation would be the more stable one as the pi-electron density of phenyl group can overlap with the vacant orbital on ...
2
votes
1answer
84 views

Confused about carbocation stability

For which element 'X' is the carbocation $\ce{CH3-X-CH2+}$ the most stable? A. X = S B. X = N C. X = O I thought since oxygen is the most electronegative among the options, it would create the ...
2
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1answer
96 views

Stability of carbocation intermediates: secondary alkane versus primary allyl?

Say I have the following carbocations: The first is secondary; the second is resonance stabilized, but primary. Which is more stable and why? I've been looking around in my textbooks and haven't ...
6
votes
1answer
71 views

Why are bridge bonds with negative or positive charge on bridge head unstable?

Why is a bridgehead having negative or positive charge unstable ? Is it something with the structure of bridge bonds ? I found this in a question .where the compound in the image is most unstable but ...
10
votes
2answers
112 views

Why is acidic hydrogen peroxide a potent oxidizer?

When hydrogen peroxide acts as an oxidizer it itself is reduced. Broadly this means that the peroxide bond is broken and that water is formed. However, why is there a tendency for hydrogen peroxide ...
7
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2answers
217 views

Question about stability of two structures of chlorine trifluoride

Why is the first structure on the left more stable than the second one on the right? In the first one the angle between the two pair of nonbonding electrons is about 120° which is a lot less than ...
8
votes
2answers
128 views

SN1 reactivity order

The question is to compare the SN1 reactivity for the following compounds. According to me it should be like R>S>Q>P. But the correct answer is Q>P>R>S. How can a lone pair donating into a vacant p ...
2
votes
1answer
174 views

Stability of beryllium carbonate

Beryllium carbonate is reported to be unstable under normal conditions and should only be kept in a atmosphere of $\ce{CO2}$. Why and how this stability is maintained? Why does this compound decompose ...
5
votes
1answer
264 views

Existence of Deuterium peroxide

Does deuterium peroxide exist? Wikipedia has no reference. Also, the sites for delivery of chemicals like "Pubchem" or "Chemspider" have no reference. In my book, a preparation of $\ce{D2O2}$ is ...
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0answers
37 views

If both Nitric acid and Nitrate ion are stabilised through resonance, what makes Nitrate ion more stable in aqueous medium?

If both Nitric acid and Nitrate ion are stabilised through resonance, what makes Nitrate ion more stable in aqueous medium? Can the same argument be applied to Nitrous acid and Nitrite ion in aqueous ...
1
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1answer
44 views

Formation of nitride and azide by group 1 elements

What property of lithium makes them forms the nitride, lithium nitride $\ce{Li3N}$ whereas the other group 1 elements forms the azide, like sodium azide and potassium azide - $\ce{NaN3}$ and ...
2
votes
1answer
201 views

Explanation of steric hindrance and existence of PI5

I have come across a following line in my textbook- $\ce{PI5}$ does not exist due to steric hindrance. I searched for the explanation of steric hindrance in Wikipedia but couldn't understand it. Can ...
1
vote
1answer
63 views

Is NADPH sensitive and unstable in UV light?

According to the MSDS for NADPH Tetrasodium Salt, it says to store it in a place away from heat and light. Does this include UV light or just visible light? I was told that a pure NADPH stock solution ...
4
votes
1answer
118 views

Is there an A value for the carbaldehyde and vinyl groups?

A methylene ($\ce{=CH_2}$) group ist sterically less hindered than a methyl ($\ce{CH_3}$) group. I'm wondering if the carbonyl ($\ce{C=O}$) group is sterically more or less larger than a methylene ...
3
votes
1answer
163 views

Stability of a carbocation, in part of camphor synthesis

Can someone explain to me why there is a rearrangement reaction of carbocation 1 to carbocation 2? To me the second carbocation appears to be less stable than the first because it is less substituted. ...
6
votes
3answers
1k views

Stability of Resonance Structures

So I was "happily" doing organic chemistry homework when I came across this question: I decided to take a look through my textbook to see what I was missing. The rules to compare resonance ...
6
votes
1answer
217 views

Ring expansion in cyclic compounds

ATTEMPT: In the first case, $\ce{H+}$ adds to the $\ce{OH}$ group, giving us a carbocation. The carbocation thus formed is exceptionally stable due to back bonding. I wonder why would it go under ...
12
votes
2answers
710 views

Exocyclic vs. endocyclic double bonds in E1 elimination

What will be the major product of this elimination reaction? The exocyclic product has more substituent groups on the alkene which should make it more stable but I have heard that exocyclic alkenes ...
2
votes
0answers
31 views

Stability of half and fully filled orbitals [duplicate]

1) My textbook tells me that chromium's electronic configuration is $\ce{[Ar]}\space 3d^5 4s^1$ instead of $\ce{[Ar]} \space 3d^4 4s^2$, as fully filled and half filled orbitals have more stability. ...
5
votes
1answer
274 views

Why is picric acid more explosive than TNT?

I've recently read that trinitrophenol (picric acid - relative effectiveness factor $1.20$) is more explosive than trinitrotoluene (TNT - relative effectiveness factor $1.00$). Personally, I think ...
5
votes
2answers
78 views

Method of deriving some properties or possible method of synthesis of a specific monomer

This is kind of like two questions but since they're related I have put them together. Consider a monomer under a hopefully anatomically correct name 'Phenyl Carbolithia Divinylene Oxide ...
5
votes
1answer
64 views

Energy of Eclipsed Interactions

I am asked to identify the highest and lowest energy conformations for the following bond-line structure (I think it is 2,2-dimethylbutane). I drew a Newman projection (for all 6 conformations) and ...
12
votes
2answers
643 views

For a given element do heavier isotopes form stronger bonds than lighter isotopes?

I know that $\ce{C-D}$ and $\ce{C-T}$ bonds are stronger than $\ce{C-H}$ bonds, but is this generally true for isotopes of all elements? (By isotopes I mean stable ones with large half lives.)
15
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1answer
1k views

Cis Trans Stability of cycloalkenes

Why is the stability of (b) greater than that of (a)? Here are my thoughts: Since (a) contains a trans double bond instead of a cis double bond, it should experience less steric repulsion and hence ...
14
votes
1answer
273 views

What is the justification for Hückel's Rule?

I know that experimentally, the rule has been verified but I am having trouble understanding why it works. I see no reason why equivalent cyclic structures can undergo resonance and be just as stable. ...