Questions tagged [stability]

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, molecular entity and/or electronic structure. It must not be applied to questions about the reactivity of particular chemical species.

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53 views

Resonance structures of cyclopentadienide [closed]

I tried several ways to produce resonance structures of the following base to prove how strong it is. I am giving a picture reflecting my thoughts. I didn't complete the structure because it seems ...
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120 views

Are there any organic compounds with three or more oxygen atoms bonded together in a straight chain?

Recently, there was a question which enquired about some oxygen rich compounds that burn themselves completely and thus not requiring any external atmospheric oxygen. The author came up with the ...
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Why is a branched alkane more stable than the straight-chain isomer?

My text book says that branched alkanes are more stable than their straight-chain isomers, but does not give any explanation. Is this merely a fact, or something that can be logically rationalized ? A ...
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Can nickel(IV) be stabilised in water using appropriate ligands?

Platinum(IV) is perfectly stable in water as its hexachlorido complex, and so is palladium(IV). However, nickel(IV) is not stable in water even in its hexafluorido complex- the exchange-inertness of ...
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Stability order of group 17 halides [closed]

Stability of halides decreases down the group since the size increases and charge density decreases, which leads to stability and we get the order of stability as follows: $$\ce{F-} < \ce{Cl-} < ...
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Why do radical inhibitors inhibit a reaction by creating a "more stable" radical, but for monohalogenation, we WANT to form the most stable radical?

According to my notes, radical inhibitors tend to turn a more reactive radical into a less reactive radical by making it more stable. For instance, the hydroquinone reacts with a radical species, ...
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Do the phosphoester and glycosidic bonds of dNTPs increase thermal stability?

A while ago, I provided an answer to a question on Biology.SE concerning the half-life of dNTPs under PCR conditions. At the beginning of my answer, I give a qualification: Caveat: ignoring the ...
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Hazards of eating non-stick coating, particularly considering the coating primer [closed]

How unhealthy are teflon / non-stick coating chips that end up eaten? What role does the primer coating play? Existing similar threads that don't go into enough detail: 1, 2 I understand that there is ...
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Finding the order of decreasing rate of solvolysis of the following molecules with aqueous ethanol [closed]

In this question, I need to find the order of decreasing rate of solvolysis of the above molecules with aqueous ethanol. I think this can be done by finding the species that can form the most stable ...
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Carbocation Stability question

Arrange, the following carbocation on increasing order of stability: What have I though is that in second it will be most unstable, as $\ce{-OH}$ group will create most inductive effect (negative), ...
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Comparing stability of two carbocations [duplicate]

Which of the following ions(A and B respectively) is more stable? How can we explain this on the basis of resonance? Here's what the solution said: Structure (A) is a primary carbocation and has no ...
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Is an emulsion of dish soap and vegetable oil stable?

If I fill a glass jar with water, vegetable oil, and dish soap, then mix it until the oil is completely emulsified, will the mixture stay emulsified indefinitely? Assuming the dish soap and oil are ...
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Neutron–proton ratio and isotope stability

I have studied that most of the isotopes (not all of them!) with a neutron–proton ratio of $\ge 1.5$ are unstable; but it is obvious that this is not true in some cases like carbon-14 or technetium-99....
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Is it correct to say that benzene is more stable than cylcohexatriene due to delocalization?

I'm virtually all chemistry books I own say that benzene is more stable than the theoretical cyclohexatriene, by 150 kJ to be specific, due to the delocalization of pi electron density around the ring....
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Energy of reactants and products [closed]

In some reactions, energy is released and when I want to understand the reason for the release of energy, I find that the energy of the products is lower than that of the reactants. But What is this ...
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Why are sulfoxides usually stable as ylides (S charged positively and O negatively)? What's the BDE for S-O?

I can't find any info on BDE for singularly bonded S to oxygen. Moreover, I'd like to understand, why is it quite usual to find sulfoxides structure written with charge separation?
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confusion regarding meta-cresol and phenol

when I googled the answer, i found out that m-cresol has a PKa value of 10.1 whereas phenol has 10.0. I am simply unable to use any logic to compare their strengths. We have been taught only the ...
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Why is this compound more basic than the other?

So, the original question was which compound is more basic. Compound A and Compound B respectively. My reasoning is that on protonation, Compound B would be more stable than Compound A as well, ...
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Reduction of nitrobenzen using LiAlH4 [closed]

Can you please explain why isn't nitrobenzene reduced to aniline but turns out as azobenzene on reaction with LiAlH4? Please explain the mechanism.
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What is the relation between strength of a base and the thermal stability of its salts?

In Concise Inorganic Chemistry, $5^{th}$ edition, by JD Lee, while discussing oxides and hydroxides of Group $2$ metals, it has been stated that: The increase in basic strength is illustrated by the ...
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Why is the rate of solvolysis of t-butyl chloride lesser than that of 1-chloro-1-methylcyclohexane?

I came across a question regarding relative rate of solvolysis. According to the answer key: My analysis: As in all the three cases, the Cl atom is bounded to a tertiary carbon, hence, all of them ...
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37 views

Is bond dissociation enthalpy same for homolytic and heterolytic cleavage? [duplicate]

In David R Klein's Organic Chemistry Book, Chapter of Radicals, one of the 'skillbuilder' questions is to identify the weakest C-H bond in the following molecule: The solution was to split each ...
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First ionization energy and electron gain enthalpy of dihydrogen / stability comparison of dihydrogen ions [duplicate]

Subset of: How can antibonding orbitals be more antibonding than bonding orbitals are bonding? Stability of $\ce{H2^{-}}<\ce{H2^{+}}<\ce{H2}$ Stability of $\ce{N2^{-}}<\ce{N2^{+}}<\ce{N2}...
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Why is salicylic acid less acidic than o- anisic acid? [duplicate]

The Pka of salicylic acid is 2.97 while that of o-anisic acid is 3.73. Why is the latter less acidic if the order of +M effect states that -OH>-OR which should make the conjugate base less stable?
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Why does a methyl shift occur during the pinacol-pinacolone rearrangement?

Why does a methyl shift occur during the pinacol-pinacolone rearrangement? I was told that methyl shift is done to stabilise the carbocation but here we are shifting the ...
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150 views

Why is ethanol more acidic than acetone?

The acidity of a compound is determined by the stability of its conjugate base and the major structure of enolate has a negative charge on the Oxygen atom. Moreover, the negative charge on the O-atom ...
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Why and how does ring expansion occur in the dehydration of (cyclobut-3-ene-1,2-diyl)dimethanol?

Can someone explain how does this ring expansion occur with the mechanism? I do understand that the hydride shift occurred because of carbocation stability but why did the ring expand? Can you please ...
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Effect of distance on the mesomeric effect

I have always thought that mesomeric effect is somewhat dependent on distance. But I recently came across a question where I was asked to predict the order of stability of o-methoxyphenyl carbocation ...
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Why is PbI₄ not composed of lead(II), iodide and triiodide?

$\ce{Pb^4+}$ is reduced by $\ce{I-},$ so $\ce{PbI4}$ cannot exist with $\ce{Pb}$ in $+4$ oxidation state. But if I replace three $\ce{I-}$ with $\ce{I3-},$ then we can have $\ce{Pb^2+}$ similar to $\...
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Carbocation formation and stability from bromo compounds

When heated,the following bromo-species all form carbocations via $\sigma$ bond cleavage. For each structure draw the corresponding carbocation and briefly describe how it is stabilised. This is my ...
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Preferred radical attack on a polyester

My question concerns the relative stability of a radical next to an ester oxygen compared to a radical next to an ester carbonyl carbon. The stabilizing effect of the electron pairs of ether oxygen ...
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What exactly is the idea of gaining stability by the various chemical species?

When we consider the alkaline metals for example, we say that an atom of a metal like sodium gains stability by losing an electron, however this doesn't seem to be a very meaningful statement. Either ...
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2answers
206 views

Keto-enol tautomerism in a bicyclo compound

Question Which one is more stable- the keto or enol form. The compound given is this: Solution The enol form would violate Bredt's Rule and would therefore be unstable. Hence the keto form is more ...
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1answer
79 views

Acidic character and anion stability across periods and groups of the periodic table [duplicate]

I understand that to compare relative acidity one must consider the stability of the conjugate bases. Across a period the electronegativity of an element increases. And that is for example why $\ce{HF}...
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1answer
343 views

Stability of complexes based on number of rings [duplicate]

$\ce{[Co(edta)]^-}$ has 5 rings in total and in $\ce{[Co(en)_3]^{3+}}$, there are 3 rings. The stability of the former is more than that of the latter. The reason I was told was that a complex with ...
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1answer
215 views

Yield of alkyl chloride in the Hunsdiecker reaction

Apparently the yield of alkyl chlorides is low as compared to that of alkyl bromides when preparing alkyl halides using the Hunsdiecker reaction. Why does this occur? The only factor I can see is the ...
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Regarding stability and reactivity of m-xylene

I came across the following two details about m-xylene: m-Xylene is thermodynamically most stable compound among o-xylene, m-xylene, and p-xylene. m-Xylene is most reactive towards nitration and ...
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On the stabler tautomer in amide-imidic acid tautomerism

In the section on acid-catalysed hydrolysis of nitriles, this webpage has the following line of reasoning; ...the more stable amide tautomer predominates the (following) equilibrium. (credit) How ...
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Is there an enolate equivalent for enamines?

I'm learning that enolates are stronger than enamines are stronger than enols in terms of general nucleophilicity. Makes sense. But what I can't find any explanation for online is why the trend ...
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Stability in 3-4 membered conjugated ring [closed]

We have 3 products one is cyclobuta-1,2 diene cyclobuta-1,3 diene and the other is cyclo prop-2-en-one, we want to find the stable product out of the 3. So,the third one due to high angle strain, ...
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Among Benzyl carbocation (Ph-CH2+) and Methyl methoxy carbocation (CH3-O-CH2+), why is the latter more stable?

Benzyl Carbocation could form multiple conjugation, then why isn't that stabler? In Methyl methoxy carbocation, Oxygen donates the lone pairs but so does the double bond in the benzyl Carbocation.
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Stabilization of multiple bonds through inductive effects

In the conversion of m-chloroanisole to m-anisidine using $\ce{NaNH2}$ and liquid $\ce{NH3}$, apparently the reason the $\ce{NH2-}$ goes for the meta- position instead of the para position is that, in ...
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How to compare stability between 5‐methylcyclohexa‐1,3‐diene and 3‐methylenecyclohexene?

Problem Compare stability of 1 and 2: Answer My approach Both have the same number of π-bonds. Both have one resonance structure. Both are non-aromatic. In 1 there are three α-hydrogens, whereas ...
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Choosing hyperconjugation when resonance doesn't give a reason for stability

Which of the following structures would be least stable? I initially approached it like this: As both are allylic carbocations, and that both are in fact resonating structures of the same molecule, ...
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1answer
120 views

Second-step activation energy in SN1 reactions

In SN1 reactions, it's known that there are generally two steps, with the first being the R.D.S step involving carbocation formation and the next having a lower activation energy. Why does the second ...
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120 views

Why is the molozonide adduct thermally unstable?

In the mechanism of alkene-ozonolysis, the intermediate molozonide adduct, which is a cyclical but symmetric molecule (shouldn't symmetry about the C-C single bond bring stability?), decomposes ...
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1answer
44 views

Which of the following compounds possess more than one percent enol content? [closed]

Which of the following compounds possess more than one percent enol content? I understood that stability of enols are dependent on the hydrogen bonding in the compounds. But here, what is the ...
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2answers
262 views

Stability of Carbanions

For comparing stability of carbanion, we use the fact that "negative charge is stable on more electronegative atom." So, The stability order is, {electronegative order: $\mathrm{sp \gt sp^2 \...
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131 views

Stabillity of ethyl, iso propyl and vinyl free radicals

Well this might seem like a dumb question but I was just wondering if any other factor would apply here as well? By simply looking at the number of hyperconjugative structures, I could easily tell ...
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31 views

How would we arrange these in the increasing order of stability? [duplicate]

Here we have three isomers of butene there structure of who I have attached: cis-butene trans-butene iso-butene I was able to figure out that the trans isomer would obviously be more stable than the ...

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