The naming of molecules and elements, usually according to IUPAC standards, but also the accepted uses of traditional ones.

learn more… | top users | synonyms

4
votes
1answer
72 views

Why doesn't the double bond get preference for suffix in IUPAC naming of an Hydrocarbon when both double bond and triple bond are present together?

In the following hydrocarbon both double and triple bond are both present and the naming happens to be hexa-1,3 diene, 5-yne but as far as I have read the rule says the suffix should be given in the ...
3
votes
1answer
84 views

What is the meaning of brackets in a condensed molecular formula?

In the formula $\ce{(CH3)3-C-CH(CH3)-CH2-CH3}$, what do the bracketed portions represent? What is the molecular structure, and how do I name the compound?
2
votes
1answer
49 views

The meaning of different parts in the naming of glucose

There are two main types of glucose, $\alpha$-D-(+)-glucose and $\beta$-D-(+)-glucose. Can anyone please explain what is $\alpha$,D or (+)? So (maybe by permutation and combination), how many types ...
2
votes
1answer
31 views

Maltose Nomenclature

Maltose has a 1,4 glycosidic linkage between 2 molecules of α-D-Glucopyranose . My textbook suggests the final name of maltose as 4-O-(α-D-Glucopyranosyl)-D-glucopyranose I wanted to know what ...
8
votes
1answer
162 views

Do molecules with axial chirality have “stereogenic units”?

This question is a follow-up to a recent question on discodermolide stereochemistry that I answered here. In the course of reading IUPAC's definition of "stereogenic center", I wondered if axially ...
5
votes
2answers
105 views

How can I draw 2,3 diethyl heptane

This question was given by my teacher in class : Draw the structure of 2,3 diethyl heptane. So I drew the following: ...
0
votes
1answer
38 views

Nomenclature of inorganic compounds

As depicted in books, $\ce{NO3-}$ and $\ce{NO2-}$ are called as nitrate and nitrite respectively. Where (-ate) suffix is used for higher oxidation state and (-ite) suffix is used for lower oxidation ...
2
votes
1answer
129 views

What does the prefix “dihydro” in the systematic name of luminol refer to?

I'm doing a research project on the fascinating chemiluminescent molecule luminol, and figured it would be a good idea to start breaking down the systematic name of the chemical and linking the terms ...
4
votes
1answer
42 views

What does it mean if a functional group has “higher priority” in terms of IUPAC naming of organic compounds?

What does "higher priority" mean exactly in the following statement from this wikipedia article (article name: "E-Z notation") on naming organic compounds in IUPAC nomenclature of organic compounds? ...
1
vote
2answers
59 views

Organic chemistry - alkanes step up reaction

Well I was studying organic chemistry, and I came across this reaction for increasing the length of the carbon chain. Upon asking my teacher about the following reaction, she said she was unsure about ...
2
votes
2answers
48 views

Why are PTFE and FEP named “ethylene” when they don't have double bonds? [duplicate]

PTFE (Polytetrafluoroethylene) and FEP (Fluorinated ethylene propylene) have the following chemical formulas: It's been years since I have taken organic chemistry, but I do remember alkenes have ...
6
votes
1answer
71 views

IUPAC naming - choosing the main branch doubts

What are the rules for choosing main branch? Wikipedia states - "Identification of the parent hydrocarbon chain. This chain must obey the following rules, in order of precedence: It should have ...
2
votes
1answer
77 views

Is cyclohexol the same as cyclohexanol?

I recently came across different names for the following compound: Is the IUPAC name for this cyclohexol or cyclohexanol? Is ...
19
votes
4answers
3k views

Is Carbon Dioxide Organic or Inorganic?

Today in Chemistry class we were discussing Organic Chemistry. We discussed what organic compounds basically are and then I asked teacher whether $\ce{CO_2}$ is organic or not. She told that it is as ...
1
vote
1answer
49 views

Order of nomenclature precedence among these functional groups

The order of precedence for functional groups I have so far is: carboxylic acid ester amide aldehyde ketone alcohol amine multiple bonds ether organic halide I'm pretty confident that from 1 to ...
2
votes
1answer
81 views

What is the proper name for the but-1-ene's isomer methylpropene?

Give the name and draw the graphical formula of an alkene that is an isomer of but-1-ene and that has a different carbon skeleton. I think it's 2-methylpropene - but I'm not sure whether the ...
2
votes
2answers
44 views

What is the origin of the naming of Desoxycorticosterone acetate?

Desoxy- means the compound misses an Oxygen comparing to the name without the prefix. Acetate means ethanoate in IUPAC language. Many biologists still abide old rules and call it acetate. And finally, ...
0
votes
1answer
28 views

Which is the parent chain in Neopentyl chloride? and why?

Which is the parent chain in this structure? and since all have 3 carbons so should any of them be the parent chain, if not .. then which should be and why? is it a rule in IUPAC naming?
4
votes
2answers
271 views

IUPAC name for a compound

What is the systematic name of the compound shown in the image My try: 3-propylpentane.
1
vote
1answer
42 views

What is the reason behind the numbering of nitrogen bases?

I am studying nitrogen bases and their structures and roles in nucleotide, polynucleotides and nucleic acids formation. In the structures of the nitrogen bases like Adenine, Guanine, Cytosine and ...
2
votes
1answer
130 views

Is Benzene Carbaldehyde a correct name?

Is benzene carbaldehyde a correct name for Benzaldehyde? I'm (always) getting confused between common and IUPAC names. If the above name is correct then is it a common one or IUPAC? And why don't we ...
2
votes
1answer
97 views

Histidine-Phosphate in Succinyl CoA synthetase and phosphoglycerate mutase enzyme

I would need to know the type of bond of histidine-phosphate in succinyl CoA synthetase enzyme. Can anyone help with this? Is it a Carboxy phosphate anhydride ? Is it the same type of bond of ...
0
votes
1answer
38 views

Why is the structure of 3, 4-Dimethylhexane given as follows?

Question: name the IUPAC name of the following structure: And here's what I could come up with is this: we start from the first carbon atom from the extreme left and end with the 2nd substitute ...
1
vote
1answer
98 views

Alkane nomenclature - choosing the parent chain - maximize or minimize substituents?

Given structure: Here's my go at it. The longest carbon chain has 10 Carbon atoms, so the root -- decane. Next: let's take the substituent in position 3, we get ...
6
votes
2answers
78 views

IUPAC Naming: 2-phenyloctane or 2-octanylbenzene

How would you name the above compound according to IUPAC rules? I see some sources say it is 2-phenyloctane, but chemdraw and a few other sources say it is 2-octanylbenzene. Also, if it is the ...
0
votes
1answer
54 views

Naming system -“ylene”

There are various compounds which have common names that end in "ylene", like acetylene and ethylene. However, how come acetylene is an alkyne whereas ethylene is an alkene. Both of these have the ...
16
votes
2answers
3k views

Why are the rare earths erbium (Er), terbium (Tb), yttrium (Y) and ytterbium (Yb) named like that?

I know the history of the discovery of the rare earth elements, that they were discovered near the village Ytterby in Sweden in the 19th century. Four elements are directly named after that village: ...
6
votes
1answer
102 views

Is there a hierarchy to functional groups?

I think I am getting slightly confused about the names we give to functional groups. I am aware that there are different types of functional groups such as alkyl, aryl and acyl groups. I also know ...
3
votes
2answers
86 views

Why doesn't this structure represent a substituted pentane?

In the following ASCI structure (single bond under "$\ce{CH}$" containing $\ce{CH2,CH2, CH3}$) $$ \begin{align*} \ce{CH3-CH2-CH2-&CH-CH3}\\ &|\\ \ce{&CH2-CH2-CH3} \end{align*} $$ The ...
1
vote
0answers
40 views

Nomenclature in Other languages

Even one letter can make a huge difference in Chemistry Nomenclature. So I am looking for credible resources that is specifically published for explaining Nomenclature rules, examples in Spanish. Any ...
1
vote
1answer
63 views

What are derived names? [closed]

Q)The derived name of (CH3)4C is A)Tetramethylmethane B)2,2-Dimethylpropane C)Neopentane D)None of these The answer was A. What is a derived name?Never heard of it in any book. Thanks
2
votes
2answers
100 views

Why is K2CrO4 Potassium chromate?

I was given $\ce{K2CrO4}$ and was asked to name the compound. Can this be done by: 1) Determining the molecular compounds oxidation state or 2) Does one need to memorize the polyatomic ions and ...
2
votes
0answers
60 views

Something I've never understood in chemistry [closed]

I've never understood how to systematically write out IUPAC names. For example, how do I write out 6-aminohexanoic acid ? I tried searching for IUPAC related terms, but I didn't get the gist of it. ...
7
votes
1answer
628 views

What is the IUPAC systematic name for methane?

The 1993 IUPAC Blue Book claims that "methane" is a semisystematic name: Semisystematic names also exist, such as "methane", "propanol", and "benzoic acid", which are so familiar that few chemists ...
0
votes
2answers
72 views

How would one express pemoline in terms of phenethylamine?

Pemoline is a psychostimulant that is no longer used in most countries. Similarly to the psychostimulants amfetamine and methylphenidate I can clearly see a phenethylamine backbone to this compound. I ...
6
votes
1answer
350 views

What is the difference between polyethene and polyethane?

The monomer in polyethene seems to drop the $\ce{C=C}$ bond and end up with a $\ce{C-C}$ bond. The polymer chain then looks like $\ce{[CH2-CH2]_{n}}$. If I were to look at that polymer chain I would ...
16
votes
1answer
811 views

Why do we write NH3?

We've learnt that the electropositive element is written first. Then why is ammonia written as $\ce{NH3}$ ?
10
votes
1answer
167 views

Why is a temporary name given to an element with an atomic number above 100?

All the elements with an atomic number more than 100 are given temporary names by IUPAC according to nomenclature rules. For example, element 101 was temporarily named "Unnilunium" until they give it ...
0
votes
1answer
29 views

Chemical nomenclature of ions

I'm a very beginner in chemistry. The book I'm studying says that an ion is an atom, or a collection of atoms, that has an electric charge, then it writes about the difference between molecules and ...
5
votes
3answers
381 views

Boat conformation: axial hydrogens

In my exam, my teacher asked me if the following is true: "The chair cyclohexane has more axial hydrogens" I did not have time to think, so I just put false. And apparently I was right. But, at home, ...
2
votes
2answers
86 views

nomenclature of organic compound

I am basic concepts of organic compound. I have seen organic compound is written is two different ways. For example This compound is written as Pentan-3-one. While in some book it is written as ...
3
votes
1answer
96 views

What are the priorities for substituent groups on a cyclohexane?

I was wondering about this specific scenario: If you have a cyclohexane, for example, and the cyclohexane has two consecutive substituent groups, for example a methyl group and an ethyl group, how do ...
1
vote
1answer
109 views

Distinguishing between 'particles', 'molecules' and 'chemical species'?

I have read this article about the difference between 'compound', 'mixture', 'element' and 'molecule', but I would like to know the precise definitions for more terms (see below). From the article, ...
1
vote
1answer
45 views

Meaning of Cu1.5Al in Cu-Al phase diagram (I understand all other indexes incl. fractions like Cu0.75Al0.25)

I understand Cu0.75Al0.25 - that's just 75% Cu, 25% Al. I understand integer indexes - that's a normal chemical formula after all. However, I have no idea how to interpret Cu1.5Al, I've never seen a ...
3
votes
1answer
143 views

Meaning of “n” in “n-octane” (and similar others)?

Straight-chain octane is also called n-octane. https://pubchem.ncbi.nlm.nih.gov/summary/summary.cgi?cid=356 ("Also known as:") I don't see any purpose for the "n"?
5
votes
1answer
345 views

-ic -ous nomenclature

I recently came across a practice problem in my textbook asking me to name a few compounds using -ic and -ous endings. The exact wording is: Write the name of each of the following ionic substances, ...
3
votes
2answers
473 views

Is “Propanol” correct name according to the latest IUPAC nomenclature?

My teacher said that Propan-1-ol can also be written as Propanol in latest IUPAC nomenclature. I doubt this because wikipedea mentions only Propan-1-ol in IUPAC naming and Propanol in other names. ...
1
vote
1answer
27 views

Finding the chemical name of SnMg₂O₄

Can somebody help me in identifying the name of $\ce{SnMg_2O_4}$? Other examples are $\ce{ZnAl_2O_4}$ (Zinc Aluminate), $\ce{ZnIn_2S_4}$ (Zinc Thioindate). Please kindly provide the reference if ...
2
votes
1answer
468 views

What is the simplest structural unit of an element or compound?

From "Smarter than a 5th Grader": What is the simplest structural unit of an element or compound? molecule, atom, neutron, proton For covalent compounds, the answer would ...
3
votes
3answers
127 views

Why isn't SiC called carbon silicate?

Is there any rule why a crystal made of Si and C is named silicon carbide SiC, but never carbon silicate CSi? Both silicon and carbon are in the same group, so share many of the atomic properties, so ...