Questions tagged [organic-chemistry]

Use this tag for questions relating to organic molecules and their properties (structure of organic molecules, spectroscopic properties, reaction mechanisms, stereochemistry etc). DO NOT use this tag as the only tag in your question, as this tag by itself cannot appropriately classify your question. Always use this tag in addition to other more specific tags.

Filter by
Sorted by
Tagged with
1
vote
0answers
6 views

Tertiary carbanion in more alkylated alkene

Saytzeff rule says that more alkylated alkene is more stable and the reason is hyper conjugation. Going by this, 2,3 Dimethyl but-2-ene should be most stable alkene due to 12-alpha hydrogen. But on ...
-1
votes
2answers
2k views

Explain optical activity in Biphenyl compounds

How is optical activity explained in biphenyl compounds using atropisomerism. NOTE: I was taught that if vertical symmetry exists then optical activity is not shown by any substituted biphenyl ...
2
votes
3answers
1k views

Does any element have nutritional (caloric) value?

Is there any single element (e.g. possibly carbon) that can be eaten, which has nutritional value in that it provides calories? I found on Wikipedia that http://en.wikipedia.org/wiki/Dietary_element ...
0
votes
0answers
9 views

How come with molecular polyatomic ions, an element with a bonding capacity can go over its limit? [duplicate]

for example, the polyatomic ion (PO4)3- has a double bond with oxygen making its valance electron count of 10? please refer to photo as I have probably not explained this visual properly.
10
votes
0answers
158 views

Some materials emit more photoelectrons than others - why?

Again, I'm a physicist turning to chemists (so bear with me). So I've been measuring some materials by changing the wavelength of the incident light on the material and I have a detecting tip like in ...
0
votes
0answers
12 views

Conditions to perform a malic acid redox-titration with potassium permanganate?

I am planning on doing an experiment to determine the amount of malic acid there is in a green apple. I was wondering about a couple of things. One, does malic acid require being treated with sulfuric ...
2
votes
0answers
15 views

Decarboxylation of THCA during CO2 Extraction of Cannabis

We have a strange problem. We are performing CO2 extraction on cannabis and we are seeing considerable decarboxylation of THCA to THC. We have high quality temperature sensors at the heat exchangers, ...
-1
votes
3answers
59 views

Converting Lactic Acid to Potassium Lactate

I am looking to try an experiment incorporating potassium lactate into soap making. This seems to be new territory for soap makers in that sodium lactate is usually used. I found a bottle of "Lactic ...
-1
votes
0answers
27 views

Electric Hotplate w/ Beaker Doesn't Transfer enough heat to Boil Isopropyl Alcohol

I bought a hotplate and beakers and I tried to heat isopropyl alcohol in a beaker with the hotplate turned up all the way - the hotplate is certainly higher than 86 degrees but the alcohol never seems ...
3
votes
0answers
25 views

A Friedel-Crafts reaction between catechol and acetone

I was thinking of ways to synthesize 2,2-bis(dihydroxyphenyl) propane and I thought it could be made by a "Friedel-Crafts" reaction between dihydroxybenzene (catechol) and acetone in strongly acidic ...
0
votes
2answers
2k views

Reaction of urea and thiourea with nitrous acid

I was told that urea on reaction with nitrous acid gives nitrogen gas, carbon dioxide and water. While on the other hand, thiourea on reaction with nitrous acid gives $\ce{H+}$, thiocyanate ion and ...
-1
votes
1answer
16 views

Why doesn't an aliphatic acyl chloride react with cyanide ions in aqueous sulphuric acid undergo nucleophilic addition elimination? [closed]

I'm asking this because im proving a friend wrong. I get how cyanide ions won't react in an ethanol solvent because the solvent is too reactive but why won't this?
5
votes
1answer
244 views

How to synthesise N,N,3‐trimethylbutanamide from 1‐chloro‐2‐methylpropane?

Suggest a synthetic route to amide C from the alkyl chloride B (reaction mechanisms are not required). Standard reagents and solvents may also be used. In this question immediate reaction is to ...
-1
votes
1answer
34 views

Understanding the term 'heat of hydrogenation'

From Chemistry Libretexts: Heat of hydrogenation (symbol: $ΔH_\mathrm{hydro}$) of an alkene is the standard enthalpy of catalytic hydrogenation of an alkene. Does the heat of hydrogenation include ...
0
votes
0answers
21 views

Why is elimination of hydrogen in the sulphonation of benzene slow

In the above reaction, why is the elimination of proton a slow step even there is a presence of strong EWG like HSO3.
-2
votes
0answers
13 views

Tea Chemistry: What is the difference between catechins, theaflavins and tannins in tea? [closed]

Can someone explain to me the different types of polyphenols in tea and the difference between catechins, tannins and theaflavins in tea?
3
votes
0answers
41 views
+50

AChE Aging time of organophosphorus compounds containing hydroxyl groups

Organophosphorus compounds are known to inhibit the enzyme acetylcholinesterase (AChE). This occurs when the OPC phosphorylates the serine-203 residue of the enzyme. If the enzyme is not reactivated ...
6
votes
1answer
72 views

How are unstable transition states determined?

The Wikipedia article about the Grignard Reaction says that The addition of the Grignard reagent to the carbonyl typically proceeds through a six-membered ring transition state. This got me ...
2
votes
1answer
37 views

Why can zwitterions be difficult detect by HPLC-MS?

I understand that to separate molecules by HPLC (or SFC) you commonly adjust the pH of the mobile phase to get preferable charges (i.e. negative charges) on the molecules - so that they interact with ...
-3
votes
0answers
32 views

nitrogen inversion barrier comparison

Recently i was doing a question based on nitrogen inversion in one particular question it was mentioned that the inversion barrier for NMe3 is less than NCl3. the only explanation i can think is back ...
-1
votes
0answers
36 views

Confused on Acid Base question [closed]

I was reading over a practice exam and am still a bit confused as to why this is true. The pKa that we memorized comes from a generic table that comes out to 11. I don't understand what the ...
-1
votes
0answers
18 views

Free radical hybridization

I know that methyl free radical is sp2 hybridised and trifluoro methyl free radical is sp3 hybridised. And I have seen the post regarding the reason too. But I want to also know a way to decide ...
-2
votes
0answers
23 views

effect of phenyl substituent on acidity

I have recently read that ortho methyl benzoic acid is more acidic then para or meta because COO- is pushed out of the plane of the ring due to repulsion from -CH3.Hence it becomes more acidic because ...
-2
votes
0answers
19 views

if 'degree of unsaturation' is same along with other atom(not H) then number of total H atom automatically be same in different compounds?

Generally in isomerism we encounter problems to verify the type of isomerism two given compounds shows. We start with checking "Is the molecular formula same?". So we count total Carbons, Other non ...
-2
votes
0answers
24 views

Oxidation of Alkenes with Alkaline KMnO4

The mechanism of the oxidation of alkenes under acidic conditions with KMnO4 is pretty well known, but I can't seem to find one for alkaline conditions. All I found is that the MnO4- ion is reduced to ...
-1
votes
0answers
51 views

Why can't strong bases cleave ethers?

I'm imagining a strong base like NaNH2 attacking the adjacent carbon of the ether, giving the oxygen a lone pair and forming an alkoxide. NH3 has a pKa of 36 while an alcohols (conjugate acid of ...
0
votes
1answer
237 views

Why are highly branched alcohols solid?

Usually branching (or decrease in surface area) leads to increased volatility. But in case of alcohols, my book states that: The higher alcohols (butanols to decanols) are somewhat viscous, and ...
-1
votes
0answers
12 views

Preparation of sodium para-aminosalicylic acid (PAS) (salt) C7H6NNaO3 [closed]

How do you react (with what do you react) 4-aminosalicylic acid, to form salt of Na, some compund of sodium to make sodium 4-aminosalicylate or sodium 4-amino-2-hydroxybenzoate or Sodium p-...
-1
votes
0answers
28 views

Are the entropy values calculated with average heat capacities

I asked myself whether the entropy values in an ordinary table in thermochemistry are calculated with exact specific heat capacities for each little temperature change or if they are averaged the ...
-2
votes
0answers
22 views

Is there any numerical comparison between phosphodiester bond and hydrogen bond in dna? [closed]

I am looking for a good reference on the numerical comparison of the phosphodiester and hydrojen bonds in dna. I am a mathematician and I do not have to much background in the chemistry and will be ...
-2
votes
0answers
34 views

Polarity of functional groups [closed]

I want to understand TLC and so I am looking at how polar are certain functional groups... And I have found different versions of the same (see below) so I want to know what which one is correct. ...
5
votes
2answers
478 views

How does sugammadex (a modified cyclodextrin) draw rocuronium into its lipophilic cavity?

Sugammadex is a modified cyclodextrin: 8 member sugar ring with carboxyl thioether extensions. Rocuronium is an aminosteroid, 4 steroid rings and one protonated amine group. Sugammadex binds ...
-1
votes
1answer
26 views
0
votes
1answer
68 views

Does space in between have any significance in IUPAC nomenclature?

The correct IUPAC name of the following compound is: (a) 2,4,6-trimethyl cyclohexanone (b) 1,3,5- trimethyl benzophenone (c) trimethylcyclobutanone (d) 2,4,6-trimethylcyclohexanone I ...
-4
votes
1answer
40 views

Which is more reactive, ethene or cyclohexane? [closed]

I know that cyclopropane is more reactive than propane, and I assume that in general cycloalkanes are more reactive than alkanes, so Hexane < Pentane < Butane < Propane < Cyclohexane < ...
5
votes
2answers
850 views

What is the correct lewis structure of SCH⁻?

I need to find the Lewis structure of the ion $\ce{SCH^-}$. I think the Lewis structure should be: $\ce{S=C-H}$, with one lone pair on the carbon and two lone pairs surrounding the sulfur. Is this ...
-2
votes
0answers
27 views

how are order for effects in organic chemistry given [closed]

I would like to know how are the orders for various effects in organic chemistry ( +M , +I etc..). I asked this to my teacher and he said they are assigned experimentally. So if they are assigned ...
5
votes
2answers
2k views

How do I find out what benzene containing compound this is with IR and NMR?

I have the following IR and NMR of an unknown substance. Can someone tell me what is a possible structure of the compound or point me in the correct direction. So far I am thinking of a benzene ring ...
-3
votes
0answers
21 views

Iodine solution reaction with potato pieces [closed]

I have a test tube with water and potato pieces. When iodine is added, does the potato and the water become blue (as starch is released from the potato in the water), or just the potato?
0
votes
1answer
31 views

Diazotization order

I know that diazotization of amines proceeds via the generation of the electrophile $\ce{NO+}$ and thereafter, the $\ce{NH2}$ group acts as a nucleophile and shares it's charge density with $\ce{NO+}$....
0
votes
1answer
97 views

Why do boiling points of alkanes and alcohols become closer with increased chain length

I came across this graph, which clearly shows a large difference between the boiling points of alkanes and their equivalent alcohols. However, it is clear that as chain length increases, the ...
-1
votes
1answer
41 views

Confirmation regarding nucleophilic addition of Grignard reagent

$\ce{A ->[(i)EtMgCl][(ii)H2O] Et3C-OH}$ A can be: a) $\ce{COCl2}$ b) $\ce{EtCOOEt}$ c) $\ce{Et2CO}$ d) $\ce{All}$ The answer should be (d) according to me, but is marked ...
1
vote
1answer
85 views

Does Glycerol give silver mirror test with Tollen's Reagent?

I did an experiment in my school lab in which we had to identify the given organic compound. In my Lab Manual, it's written: Take 2 ml of Tollen's Reagent and add a few drops of organic sample. ...
-2
votes
1answer
39 views

Why ethyl ethanoate and not acetic acid? [closed]

In saponification reaction ethyl ethanoate is made to react with NaOH to form sodium acetate as the soap and ethanol as a by-product. My question is : Why don't we use ethanoic acid instead of ethyl ...
-1
votes
1answer
48 views

Allylic Rearrangement in formation of Grignard Reagent

Is an allylic rearrangement possible in formation of Grignard reagent? Going by the following single electron transfer mechanism, I think it's possible. But, I haven't found any references.
0
votes
1answer
30 views

How do you recover monosaccharides from an acidic solution [closed]

I'm doing a project on how to most have the most efficient pretreatment of lignocellulose. After I let the lignocellulose undergo hydrolysis, and it is broken down into simple sugars, I want to ...
4
votes
1answer
310 views

What is the mechanism for this nucleophilic conjugate addition?

What is the mechanism for this reaction- My working so far: But my final product doesn't match with the one given. Where did I go wrong (if at all)? How should I have proceeded?
4
votes
1answer
578 views

Are alkenes with bulky groups attached (like the one shown in the picture) chiral or achiral?

Is the compound in the picture chiral or achiral? I think it should be achiral for the following reasons: There is free rotation. I know, but for every configuration produced by free rotation ...
-1
votes
2answers
99 views

Why is this grignard synthesis incorrect?

This reaction is mentioned as incorrect in my exercise book. Why is this so? My guess was that the Magnesium, instead of forming a grignard reagent with the compound and bromine, would instead form a ...
-1
votes
0answers
18 views

Malachite green redox center? [closed]

Where is the redox core of malachite green? It is known that when it is reduced, for example, by taking electrons out of NADPH2 the green color fades away. But I cannot identify a clear redox center ...

1 2 3 4 5 150