Questions tagged [reactivity]

Applied to a chemical species, the term expresses a kinetic property in reference to another species. The tag should be applied to questions seeking answers with respect to the reactivity (or unreactivity) of a certain chemical compound, species, molecular entity and/or functional groups. It must not be applied to questions about the stability of certain chemical species.

Filter by
Sorted by
Tagged with
8
votes
1answer
66 views

Why does radium form a nitride rather than oxide when exposed to air?

The Wikipedia article states: Pure radium is silvery-white, but it readily reacts with nitrogen (rather than oxygen) on exposure to air, forming a black surface layer of radium nitride ($\ce{Ra3N2}$)....
8
votes
2answers
297 views

Compare rate of hydrohalogenation between 1,2-diphenylethene and 1-phenylpropene

Consider the compounds, (I) - 1,2-diphenylethene and (II) - 1-phenylpropene. Compare their rate of hydrohalogenation (HX addition) I feel that the answer should be (II) > (I), but to my surprise it's ...
7
votes
1answer
9k views

Which allotrope of phosphorus is kinetically the most stable?

Which allotrope of phosphorus is kinetically the most stable? I ruled out white and yellow as being quite reactive. Red and black allotropes are both polymeric and comparitively less reactive. ...
7
votes
2answers
13k views

Order of electrophilic substitution

What will be the order of reactivity towards electrophilic substitution in case of the following compounds: benzene, ethyl benzene, isopropyl benzene, tert-butyl benzene The answer at the end of the ...
7
votes
1answer
388 views

What are the conditions for liquid metal to be corrosive to another, different solid metal?

I've had already been aware of the fact that metallic aluminum can be degraded by coming in contact with mercury, but also came across another question more recently here explains a similar reaction ...
7
votes
1answer
4k views

Why are carbonyl compunds more reactive towards catalytic hydrogenation than alkynes and alkenes?

Alkynes are more reactive towards catalytic hydrogenation than that of alkenes, because they are more unsaturated. This is the correct reasoning, right? But why are carbonyl compounds more reactive ...
7
votes
1answer
16k views

Reaction between magnesium metal and sodium hydroxide: Does this even happen?

Came across this question in a book: Among aluminum, zinc, tin and magnesium, which metals (if any) will react with an aqueous solution of sodium hydroxide to displace dihydrogen? The answer to ...
7
votes
1answer
251 views

Quantum mechanical (or QFT) description of mesomeric effect

This is rather a question about finding the right literature, since the answer would probably exceed a typical forum post. In organic reactions, mesomeric and inductive effects are of tremendous ...
7
votes
2answers
50k views

How can I relate the reactivity series to electronegativity and ionization energy?

I am trying to figure out how the reactivity series comes about. My understanding is that elements with a higher electronegativity will be more reactive than elements with a lower electronegativity, ...
7
votes
0answers
224 views

Solve this chemical or biological mystery

I hope this is the best place to pose this unique question. Please forgive me if it's not. I went into a closet to get a prescription medication that was filled about a year ago. The label on the ...
7
votes
1answer
2k views

Bonding of Lithium and Argon

I saw a meme that was joking around about Lithium and Argon bonding (see pic below). It got me wondering: Can Lithium and Argon bond in any circumstance?
6
votes
3answers
7k views

Why do the trends in reactivity not apply for francium?

Why is francium not included in the reactivity series? Why is potassium considered more reactive than francium? I know that reactivity increases down the group, but why does it not apply here?
6
votes
1answer
1k views

Should I expect any surprise when trying to shoot green fireballs like this?

I wanted to use flash cotton (nitrocellulose) to ignite fireballs with an electric trigger. In order to make green fireballs, my attempt will be to put some drops of boric acid solution on each (...
6
votes
1answer
3k views

What makes R-MgX a more reactive Grignard reagent than R-Cu?

What makes $\ce{R-MgX}$ a more reactive Grignard reagent than $\ce{R-Cu}$? Has it to do with solvation, bond enthalpy, electronegativity?
6
votes
1answer
275 views

Why is the alkene a more stable species in this case?

How can we account for $\mathrm{S_N1}$ substitution in this case versus elimination in others? When we dehydrate alcohols, we usually carry out the reaction in concentrated sulfuric acid and at high ...
6
votes
3answers
3k views

Can aluminum and hydrochloric acid be used to generate hydrogen gas?

I am looking to produce hydrogen gas in a small amount with supplies I currently have. Most of the methods I have seen involve reacting zinc or magnesium with $\ce{HCl}$ to obtain the gas, but I do ...
6
votes
1answer
11k views

How can the iron in the reaction of iron (ii) chloride and zinc not go to zero oxidation state?

I know that the zinc half equation would be $\ce{Zn -> Zn^{2+} + 2e-}$. However I am confused about the half equation for iron. I would think that since iron is completely displaced, its oxidation ...
6
votes
2answers
1k views

If glucose can react with phenyl hydrazine to form osazone why can't it react with 2,4-DNP to give positive test?

If glucose can react with form phenyl hydrazine to form osazone why can't it react with 2,4-DNP? Yes I know about cyclic form of glucose and its equilibrium with straight chain and all … I read ...
6
votes
2answers
4k views

How do we know whether we will get a mono substituted or tri-substituted product during electrophilic aromatic substitution?

For example consider the bromination of phenol we get the tri-substituted product (even though bromine is deactivating so I suppose it should deactivate the ring with each addition) while sulphonation ...
6
votes
1answer
2k views

Why does free silicon react with water?

Free silicon is not found in nature (in water, it might be present in the form $\ce{Si(OH)_{4}}$. Some compounds of silicon, such as silane ($\ce{SiH_{4}}$) will react spontaneously in an aqueous ...
6
votes
1answer
3k views

Why is benzenediazonium fluoroborate water insoluble and stable at room temperature?

Benzenediazonium fluoroborate is water insoluble and stable at room temperature. Why is this salt, water insoluble? Also I am told that benzenediazonium salts are stable only at low temperature(<5°...
6
votes
1answer
674 views

What typically happens to H2 molecules released into atmosphere (with no spark source)?

I'm wondering what happens when $\ce{H2}$ leaks from say a transmission pipe in an unenclosed area. No immediate source of ignition, I know it rises more quickly than helium (x2 I believe) and ...
6
votes
1answer
247 views

Electrophilicities of carboxylic acid derivatives

I would like to ask about the rate of hydrolysis for 4-hydroxyphenyl acetate (A), N-(4-hydroxyphenyl)acetamide (B), 4-hydroxyphenyl chloroacetate (C), and methyl 4-hydroxybenzoate (D). I know that ...
6
votes
1answer
375 views

How can collission theory of chemical reaction and Law of mass action be connected?

From Wikipedia, Collision theory is a theory ... that qualitatively explains how chemical reactions occur and why reaction rates differ for different reactions. The collision theory states that ...
6
votes
0answers
2k views

SN1 reactivity order for chloromethyl methyl ether and trityl chloride

Compare the reactivity order towards SN1 reaction for: (2-chloropropan-2-yl)cyclopropane $\ce{CH3OCH2Cl}$ $\ce{Ph3CCl}$ Owing to the exceptional stability of cyclopropyl ethyl ...
6
votes
2answers
603 views

Comparing nucleophilicity

We have to compare the nucleophilicity of $\ce{OH-,NH2-,CH3CH2-}$ and $\ce{CH#C^{-}}$. I managed to find out that $\ce{CH3CH2-}>\ce{NH2-}>\ce{OH-}$ and that $\ce{CH3CH2-}>\ce{CH#C-}$. But I ...
6
votes
0answers
2k views

How to compare the oxidizing power of perhalate ions

In my book the oxidizing power in descending order of the following is given as: $\ce{BrO4-} > \ce{IO4-} > \ce{ClO4-}$ My doubt is regarding their order of oxidizing tendency. I thought that ...
5
votes
5answers
951 views

Can halogens exist in their elemental state in nature?

Question 7 from the 2015 Australian Chemistry Olympiad was: Which list below gives non-metals that can be found in their elemental form in nature? (a) neon, phosphorus, fluorine (b) helium, hydrogen, ...
5
votes
1answer
1k views

Comparing SN2 reaction rate for phenacyl chloride and methyl chloride

KI in acetone undergoes $\mathrm{S_N2}$ reaction with (1) and (2). Compare the rates of the reactions. Like many kinds of these questions there are many factors involved. One is the steric effect, ...
5
votes
4answers
2k views

Which is more reactive, chlorine radical or chloride ion?

Ions are very reactive for obvious reasons (i.e. Coulomb force); $\ce{Cl-}$ ions will be very quick to form an ionic bond with positive ions (unless inhibited, e.g. through being in a solution; let's ...
5
votes
2answers
2k views

Are there stronger oxidizing agents than fluorine gas?

Are there stronger oxidizing agents than fluorine gas, so it could oxidize fluoride to fluorine? Also, in case of oxygen, fluorine gas can oxidize oxygen gas to the exotic dioxygenyl ion. Can ...
5
votes
1answer
2k views

Is graphene chemically reactive?

Different internet sources say different things. If possible, can someone explain why it is (or isn't) chemically reactive?
5
votes
2answers
798 views

How can I work out what reaction will happen?

I have recently started learning chemistry, and I've been reading a GCSE (UK high school level) textbook on the stuff :D Much of it has been fairly straightforward, though there has been a ...
5
votes
1answer
2k views

Why do Grignard reagents react with epoxides but not THF?

THF is used as a solvent for Grignard reagents, but epoxides react with Grignard reagents. There is only a small difference between epoxides and THF, what causes the difference in reactivity towards ...
5
votes
1answer
399 views

Reactivity of propellanes

Why is [1.1.1]propellane considerably less reactive than either [2.2.1]propellane or [2.1.1]propellane as illustrated in the hydrogenation reactions pictured below?
5
votes
1answer
2k views

Phenol or ethanol as a nucleophile for ether formation?

If we react phenol with $\ce{C2H5I}$ in $\ce{C2H5O- Na+}$ (excess), $\ce{C2H5OH}$ (anhydrous) solutions . In this reaction why is diethyl ether not formed and the actual product is phenyl ethyl ...
5
votes
1answer
179 views

Do epoxide rings react with bases?

We've learned in class that epoxide ring openings can be catalyized with acids, and I seem to recall either the professor or a classmate mentioning that they also react with bases, but some quick ...
5
votes
1answer
1k views

SN2: Neopentyl halides and methyl halides

Two part question for you. Let's preface this with I'm in organic chemistry 1, so we're just learning the basics of these reactions. Are neopentyl halides completely inert to any reaction through any ...
5
votes
2answers
384 views

Determination of products in reactions involving carbocation rearrangement?

How do you determine the migratory "aptitude" of various groups during carbocation rearrangements? Is there a experimentally determined order? For example, what will be the product in case of the ...
5
votes
1answer
132 views

Nucleic Acids Bonds

In a paper I am reading regarding instability and decay of DNA, the author says: "The chemical price paid for the greatly increased resistance of the nucleic acid phosphodiester bond (gained by ...
5
votes
1answer
3k views

Why do Grignard reagents or Organolithium compounds not displace halides as easily as acetylide ions do?

This is a snapshot from LG Wade Organic Chemistry. I have a doubt with a particular statement in the book. It says that Grignard reagents do not displace halides as easily as acetylide ions do. But ...
5
votes
1answer
2k views

When, how and why does sodium metal react with cycloalkenes, cycloalkadienes, cycloalkatrienes?

I've been searching for the conditions necessary for the reaction of sodium (Na) metal with cycloalkenes, cyclo-di-alkenes, cyclo-tri-alkenes all over the internet but I cannot find a proper answer. ...
5
votes
1answer
1k views

Grignard reagents react with epoxides but dissolve in THF, what happens in oxetane (four membered ether ring)?

Ring strain causes the epoxides to react and THF does not react because the ring strain is not large enough. Does the four membered ring react or not? Does it favor reaction with the harder or softer ...
5
votes
2answers
4k views

Reaction of amines with diethyl oxalate (Hofmann amine separation method)

Why does only one molecule of secondary amine react with diethyl oxalate and two molecules of primary amine react with diethyl oxalate? I feel secondary amine also should have reacted similar to ...
5
votes
0answers
76 views

Reactivity of carbon-centered radical

I've read this site for a long time but I had never asked a question, so this is my first time :). So, i'm currently working on a computational chemistry project on radical cyclization reactions and ...
5
votes
0answers
93 views

Advanced Quantum Chemistry Reference for Reactivity Phenomena

I'm currently in organic synthesis seeking to develop quantitative "physical" (that of a physicist), rather than "chemical", intuition for areas where traditional VSEPR/ MO models cannot fully ...
4
votes
2answers
17k views

Why do SN1 reactions prefer tertiary carbons?

I can understand that $\mathrm{S_N2}$ reactions prefer primary carbons, because of the steric hindrance that would be an obstacle. But what is the exact reason that $\mathrm{S_N1}$ reactions prefer ...
4
votes
2answers
328 views

Reaction of glucose acetal with acetic anhydride

The following problem was asked in JEE Mains 2020 (Sept 2, Shift 1), Consider the following reactions: $\ce{ (i) Glucose + ROH ->[dry HCl] Acetal ->[$x$ eq. of (CH3CO)2O] acetyl derivative }$ $\...
4
votes
1answer
551 views

Which is easier, the nitration of toluene or the nitration of mesitylene (1,3,5-trimethylbenzene)?

Does the toluene can undergo nitration easier than mesitylene (1,3,5-trimethylbenzene), due to the high repulsion that will occur between $\ce{NO2}$ and the two adjacent methyl groups (in mesitylene ...
4
votes
1answer
1k views

Why would I not see a reaction between aluminum and tin(IV) chloride?

I was performing an experiment where I was supposed to construct a modified activity series between certain elements. I decided to use chlorides with the other metals for single replacement reactions ...

1
2
3 4 5
8