Questions tagged [hydrogen-bond]

Bond between covalently bound hydrogen atom and atom possessing a lone pair of electrons.

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Why Aren't Alcohols Weak Bases?

I was reading about alcohols being weak acids because they are deprotonated in water, presumably because the $O-H$ bond is being overcome by hydrogen bonding between $H$ in the hydroxyl group and $O$ ...
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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 ...
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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} \\ &\...
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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 ...
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Hydrophobic effect/interactions

$\text{Water molecules cause hydrophobic interactions because:}$ $\text{A- they can disrupt surfaces with no hydrogen bonds.}$ $\text{B- they prefer to be close to hydrophobic surfaces}$ $\text{C- ...
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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 ...
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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 ...
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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 ...
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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 ...
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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?
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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?
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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-...
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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 ...
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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-...
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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 ...
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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<< ...
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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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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 ...
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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 ...
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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)...
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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 ...
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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 ...
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1 answer
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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?
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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
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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-...
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2 votes
1 answer
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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 ...
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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 ...
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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.
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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 ...
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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 ...
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2 answers
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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 ...
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3 votes
1 answer
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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 ...
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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 ...
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How the attraction takes place between a hydrogen atom and the acceptor atom in a hydrogen bond

In hydrogen bonds present in water,does the hydrogen atom attracts to the lone pair of electrons present on the oxygen atom or to its partial negative charge? If former is the case are there any ...
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7 votes
2 answers
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Do amines or alcohols have stronger intermolecular hydrogen bonds?

Which has stronger hydrogen bonding, $\ce{CH3OH}$ or $\ce{CH3NH2}$ I think it comes down to which has more dominance; number of hydrogens, number of lone pairs, or electronegativity.
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Extent of Hydrogen bonding in H2O2

Several books that I have read say that in $\ce{H2O2}$ the degree or extent of H-bonding is 6 as each H atom would form 1 and O atom would form 2 H-bonds respectively. However if we look at HF the no....
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