Questions tagged [hydrogen-bond]
Bond between covalently bound hydrogen atom and atom possessing a lone pair of electrons.
246
questions
0
votes
1
answer
27
views
Can flaxseed (linseed) oil undergo hydrogenation?
I'm curious if it's possible to chemically hydrogenate flaxseed (linseed) oil. I've never seen it in hydrogenated form. Given its quality as an excellent wood protectant, I figure it would be easier ...
- 601
-3
votes
1
answer
23
views
Difference between number of hydrogen bonds formed and number of hydrogen bonds in a molecule [closed]
I would like to know how to count the number of hydrogen bonds formed in a molecule and the number of hydrogen bonds that a molecule has. For example, water forms two hydrogen bonds with its two ...
1
vote
3
answers
148
views
Can hydrogen fluoride form three or more hydrogen bonds? [duplicate]
As far as I know, each $\ce{HF}$ molecule has two hydrogen bonds, one formed by its hydrogen atom and one which the $\ce{F}$-atom forms with hydrogen atom of a third $\ce{HF}$ molecule.
In other ...
- 29
-1
votes
1
answer
40
views
intramolecular h-bonding in maleic acid
While studying organic chemistry, I came across two practice questions given by my professor:
Compare the acidic strength of:-
Maleic acid and Fumaric acid
o-nitrophenol and p-nitro phenol
And the ...
7
votes
1
answer
690
views
How can we explain solubility of hydrogen sulfide in water?
On my most recent high-school chemistry exam I had a longform question where I was supposed to compare the solubilities in room-temperature water under normal pressure of a few molecules. According to ...
- 83
3
votes
1
answer
89
views
Comparison of hydrogen bond strength
Consider the following sets of H-bonds:
$$
\begin{align}
&\text{P:} &\ce{-O-H\bond{....}N} \\
&\text{Q:} &\ce{-O-H\bond{....}O} \\
&\text{R:} &\ce{-N-H\bond{....}N} \\
&\...
5
votes
2
answers
337
views
Dissolution of sugar in water and its temperature dependence
As far as I can remember, I was taught in 6th grade that warm water would dissolve sugar with greater ease than cool water. In 11th grade, I was taught that Hydrogen Bonding is the reason behind ...
0
votes
1
answer
55
views
What drives hydrophobic effect/interactions? (multiple choice question)
Water molecules cause hydrophobic interactions because
A- they can disrupt surfaces with no hydrogen bonds.
B- they prefer to
be close to hydrophobic surfaces
C- they are restricted in their rotation ...
0
votes
0
answers
15
views
DI water vs. Tap water in ethanol-water and salt phase change reaction
We did a very simple lab like one you would do in highschool showing that you can seperate the phases of water and ethanol using salt. As simple as it sounds, we could not get it to work no matter ...
- 1
0
votes
0
answers
64
views
What are the necessary conditions for formation of a Hydrogen Bond?
Usually Hydrogen bonds are associated with N,O,F as the atoms involved. In some cases OH---Cl bond is observed as in case of o-chlorophenol.
According to the updated IUPAC definition a Hydrogen bond ...
0
votes
0
answers
33
views
Why does steam store large amounts of energy?
We all know that steam can be used to perform mechanical work and steam has a high capacity for energy storage. But why does steam have such high energy capacity?
I tried searching for answers on the ...
- 193
3
votes
1
answer
123
views
Does hydrogen bonding affect the structure of a molecule?
We know an individual molecule of $\ce{H2O}$ has a bent structure, but if we consider a volume of water, then there are many molecules having hydrogen bonding with each other. Due to this, does the ...
0
votes
0
answers
207
views
Are hydrogen bonds between two hydroxyl groups stronger if one is deprotonated?
Hydrogen bonds can form between two hydroxyl groups. Is the hydrogen bond stronger if one of the groups is deprotonated?
- 45
1
vote
0
answers
176
views
Do CHF3 and acetone form a hydrogen bond?
I haven't been able to find a reference confirming that fluoroform forms hydrogen bonds with acetone. Do they?
- 55
2
votes
1
answer
294
views
What is the reason for the boiling point of benzene-1,4-diol being higher than that of benzene-1,3-diol?
What is the reason for the boiling point of benzene-1,4-diol being higher than that of benzene-1,3-diol?
Both have hydrogen bonds. I think it is due to quinol's symmetry but can't point out exactly ...
- 353
0
votes
1
answer
122
views
Hydrogen Bonding in case of nitro group [closed]
In many different cases of Nitro group I have seen that only one oxygen atom is particularly used for hydrogen bonding but not the other one.But I guess both the bonds should be polar and hence show ...
1
vote
2
answers
68
views
Hydrogen Bond Length and Lattice Density [closed]
The subject of the density of solid water is discussed on Physics Stack Exchange in this post.
In the post, it is said that..
the way the molecule is angled ensures that a specific (energetically
...
4
votes
0
answers
99
views
Would the hydrogen-bonded polymer hexaamminecobalt(III) hexakis(trifluoromethyl)cobaltate(III) be soluble in water?
It is clear that both the hexaamminecobalt(III) ion and the hexakis(trifluoromethyl)cobaltate(III) ion are both low spin (the former is already low spin, and the trifluoromethyl ligand is clearly ...
- 628
7
votes
1
answer
650
views
Does ammonia exhibit hydrogen bonding in its gaseous state?
I was reading the properties of ammonia in my book (NCERT Chemistry Part I, Textbook for Class XII)
where it was written :
In the solid and liquid states, it (ammonia) is associated through hydrogen ...
- 385
8
votes
1
answer
161
views
Out of tropolone and tropone, which is more soluble in water?
According to me tropolone has intramolecular H-bonding, so extent of H-bonding with water will decrease and thus, will be less soluble.
Tropone (Cyclohepta-2,4,6-trien-1-one):
Tropolone (2-...
- 89
3
votes
1
answer
324
views
Which compound of these following have electrovalent, covalent, coordinate as well as hydrogen bond?
Which compound have electrovalent, covalent, coordinate as well as
hydrogen bond ?
A) $\ce{[Cu(H2O)4]SO4.H2O}$
B) $\ce{[Zn(H2O)6]SO4.H2O}$
C) $\ce{[Fe(H2O)6]SO4.H2O}$
D) $\ce{[Fe(H2O)6]Cl3}$
Answer ...
- 1,359
12
votes
2
answers
538
views
Why hydrogen bonding in some acids make them a stronger acid when it is present even before deprotonation?
If we take the example of salicylic acid, hydrogen bonding is present in the acid as follows:
Even after deprotonation, it has intramolecular hydrogen bonding as follows:
My question:
p-...
- 442
2
votes
1
answer
1k
views
Why is Maleic Acid more soluble in water than its trans isomer Fumaric Acid?
My teacher taught me that compounds having intramolecular H-Bonding are relatively less soluble in water as they will not involve in H-Bonding with water appreciably while those able to do ...
1
vote
0
answers
46
views
Comparing the boiling points of common organic molecules
The order I was provided with is(comparing molecules of similar molecular mass from each);
alkanes< ethers< esters< aldehydes< ketones<< alcohols<< carboxylic acids<< ...
- 1,086
0
votes
1
answer
53
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 ...
2
votes
1
answer
92
views
What happens when hydrogen bonds stretch?
I'm researching about the Mpemba effect and I came across an explanation saying that the effect occurs because at higher temperatures, the hydrogen bonds between the water molecules stretch and store ...
- 134
1
vote
1
answer
161
views
How do point mutations affect complementary base-pairing and widths of the nucleotide pairs?
Point mutations are divided into two categories: transitions and transversions. Since point mutations only occur during DNA replication (an integral process of both mitosis and meiosis), the mutated ...
- 99
0
votes
1
answer
36
views
How to interpret this formula about hydrogen bond energy
I want to evaluate some chemistry related formulas, which I don't understand.
In proteins, hydrogen bonding often occurs between the oxo group = O oxygen of one amino acid and the α-amino group (N − H)...
- 101
2
votes
0
answers
42
views
Why are Hydrogen bonds directional? [duplicate]
While reading about Hydrogen bonding in a book (O.P. Tandon's G.R.B. Organic Chemistry), I came across a sentence that was mentioned in a rather unstructured way relative to how comprehensive I was ...
- 453
0
votes
1
answer
549
views
Why is boiling point of Ammonia greater than Arsine?
I have previously read that the boiling point of Stibane(SbH3) is greater than Ammonia(NH3) as ammonia is gas at room temperature and no hydrogen bonding exists in the gaseous form of NH3.
Hence, as ...
-3
votes
1
answer
252
views
Is "Hydrogen Bonding" coordinate covalent bond? [closed]
My textbook says:
The Oxygen atom of other molecules links to form coordinate covalent
bond with H-atom using lone pair.
Now I am confused. Is H-bonding coordinate covalent bond?
0
votes
1
answer
486
views
How is o-Fluorophenol more acidic than phenol even after having Hydrogen bonding?
Source: Concepts of Organic Chemistry by Dr OP Tandon, Himanshu Pandey, Dr AK Virmani
Page no: 241
1
vote
2
answers
709
views
Why does hydrogen bonding require a lone pair? [closed]
Why does hydrogen bonding require a lone pair of electrons on the partially negative atom? They would still be partially negative even without the lone pair right? Or does a bond exist, but is much ...
- 153
3
votes
0
answers
62
views
Why ethyl cyanide and propanol have the same boiling point?
As I understand, the intermolecular forces of ethyl cyanide are of van der Waals nature (dipole-dipole) but in the propanol molecule there are hydrogen bonds which are in principle much stronger. Why ...
- 201
1
vote
0
answers
73
views
Hydrogen bonding in acetylene and other terminal alkynes
My textbook says that hydrogen bonding is possible only when there is acidic hydrogen connected to an electronegative atom like $\ce{N}$, $\ce{O}$ or $\ce{F}$ and a basic lone pair of electrons on ...
- 148
-1
votes
1
answer
301
views
Why is Bonding between H and Cl not considered as H bonding? [duplicate]
Cl is an electronegative element and hydrogen is electropositive. Why are intermolecular interactions involving H and Cl not considered as H bonding? I read it in a book but there was no reason given ...
- 430
0
votes
1
answer
99
views
Effect of isotopes on H-Bonding
The following question was asked in one of the assignments my teacher has given.
Acetone ($\ce{Me2CO^16}$) on treatment with $\ce{H2O^18}$ gives a mixture of $\ce{Me2CO^16}$ and $\ce{Me2CO^18}$, the
...
- 1,349
0
votes
1
answer
259
views
Compare the boiling points of isobutane and 1-butyne
Question: Compare between the boiling points of isobutane and 1-butyne
The answer to this question is given as 1-butyne has higher boiling point than isobutane.
My approach: I have been taught a few ...
- 197
2
votes
1
answer
1k
views
Relative strength of intermolecular forces [duplicate]
My attempt at a solution:
First I look for hydrogen bonds:
The only compounds with hydrogen bonds are the second and fourth ones, so they have the strongest intermolecular forces. The second must have ...
- 23
2
votes
1
answer
55
views
Hydrogen bonding in sugar acids
I recently learnt that the reason for low solubility of mucic acid as compared to glucaric acid was more hydrogen bonding in the crystal state of mucic acid as compared to glucaric acid.
I would ...
- 65
0
votes
0
answers
56
views
Why isn't there a hydrogen bond present between the oxygen atom and hydrogen atom of adjacent alcohol groups?
*I know that there is inter-molecular hydrogen bonding between the molecules of glycerol.
*What makes the adjacent alcohol groups behave differently towards each other as compared to when they ...
- 41
1
vote
1
answer
103
views
Why don't dicarboxylic acids show hydrogen bonding in spite of the fact that carboxylic acids exist usually as dimers in polar aprotic solvent? [closed]
I have seen several examples:
The fact that maleic acid is more soluble in water than fumaric acid in spite of the fact that it must be able to show intramolecular hydrogen bonding.
trans-...
- 19
2
votes
1
answer
315
views
What is exposed in the surface tension of water?
(I guess) I understand the covalent bonding of water and the hydrogen bonding of water between two different molecules, but I would like to know which part is the part that that exposes itself to the ...
- 137
1
vote
0
answers
107
views
Why aren't the hydrogen bonds in carboxyllic acids like this?
Why don't carboxylic acids form H-bonds in this formation with the red dots (diagonal) instead of the black dots (horizontal)?
I was always taught that H-bonds formed between partially negative and ...
- 1,420
1
vote
0
answers
74
views
Water solubility comparison of stereoisomers of bicyclo [4.4.0] decane-3,4-diol
I think, (I) must be more soluble in water. It is due to trans configuration and thus, forming more effectively inter-molecular hydrogen bonds with water molecules.
- 1,157
1
vote
0
answers
66
views
Factors dominating forces between acetone and chloroform
What type of interaction is present between acetone and chloroform?
According to me, acetone has weak hydrogen-bonds with chloroform, the hydrogen on an electronegative atom has electron density that ...
- 31
7
votes
2
answers
2k
views
Solubility of ortho- and para-nitrophenol in benzene
Which one between o-nitrophenol and p-nitrophenol is more soluble in benzene? And what is the reason? If the solvent had been polar, hydrogen bonding would have provided a lot of explanation, but what ...
- 574
-1
votes
2
answers
60
views
If acid releases proton then how can a proton react with another proton to form hydrogen gas? [duplicate]
As we know that acid releases proton (H+ ion) when dipped in water hydrogen has a proton and electron only . To form H+ hydrogen releases 1 electron and it becomes proton. But when Acid reacts with ...
- 11
3
votes
1
answer
763
views
How does the entropic force arise within the hydrophobic effect?
I know that the hydrophobic effect is usually explained by the entropic effect originating from the disruption of hydrogen bonds between molecules of water and the nonpolar substance. The hydrogen ...
- 153
1
vote
0
answers
28
views
How to get the right formulas for combustion (rocket chamber) or where to find them? [closed]
I am a space enthusiast and am intrigued mostly by rockets.
I recently found a book HOW to DESIGN, BUILD and TEST SMALL LIQUID-FUEL ROCKET ENGINES and have been fiddling around with rocket engine ...
- 19