Which group forms the strongest H-bonds to water molecules? (a) Alcohols (b) Ethers (c) Phenols (d) All equally strong

Which group forms the strongest H-bonds to water molecules?
(a) Alcohols
(b) Ethers
(c) Phenols
(d) All equally strong
by

1 Answer

Answer :

Phenols
by

Related questions

Phenols do not undergo substitution of the — OH group like alcohols. Explain.

Description : Phenols do not undergo substitution of the — OH group like alcohols. Explain.

Last Answer : The C — O bond in phenols has some double bond character due to resonance and hence cannot be easily cleaved by a nucleophile. In contrast, the C — O bond in alcohols is a pure single bond and hence can be easily cleaved by a nucleo phile.

What property of low-molecular weight aldehydes and ketones accounts for the magnitude of their boiling points? (a) The ability to form strong H-bonds between their molecules. (b) The ability of the carbonyl oxygen to form H-bonds with other carbonyl groups. (c) The ability of the polar carbonyl group to attract other polar molecules. (d) The ability of the carbonyl group to attract electrophiles and form bonds.

Description : What property of low-molecular weight aldehydes and ketones accounts for the magnitude of their boiling points? (a) The ability to form strong H-bonds between their molecules. (b) The ability of ... other polar molecules. (d) The ability of the carbonyl group to attract electrophiles and form bonds.

Last Answer : The ability of the polar carbonyl group to attract other polar molecules.

Assertion (A): Alkyl aryl ethers on reaction with HI give alkyl iodide phenols Reason (R): Aryl - oxygen bond is weaker than alkyl oxygen bond

Description : Assertion (A): Alkyl aryl ethers on reaction with HI give alkyl iodide phenols Reason (R): Aryl - oxygen bond is weaker than alkyl oxygen bond

Last Answer : Assertion (A): Alkyl aryl ethers on reaction with HI give alkyl iodide phenols Reason (R): Aryl - oxygen ... is false D. A is false but R is true

Alcohols are easily protonated than phenols. Justify.

Description : Alcohols are easily protonated than phenols. Justify.

Last Answer : Ans. In phenols lone pair of electrons on the oxygen atom are delocalised over the benzene ring due to resonance and hence are not easily available for protonation. In contrast in alcohols, ... oxygen atom are localized due to absence of resonance and hence are easily available for protonation. 

Phenol has smaller dipole moment than methanol. (OR) Why are dipole moments of phenols smaller than dipole moments of alcohols ?

Description : Phenol has smaller dipole moment than methanol. (OR) Why are dipole moments of phenols smaller than dipole moments of alcohols ?

Last Answer : Due to electron-withdrawing effect of the benzene ring, the C — O bond in phenol is less polar but in case of methanol due to electron-donating effect of — CH3 group, C — O bond is more polar.

Phenols can be easily distinguished from alcohols because (a) phenols are soluble in NaOH, but alcohols are not (b) alcohols are soluble in NaOH, but phenols are not (c) phenols are soluble in NaHCO3, but alcohols are not (d) alcohols are soluble in NaHCO3, but phenols are not

Description : Phenols can be easily distinguished from alcohols because (a) phenols are soluble in NaOH, but alcohols are not (b) alcohols are soluble in NaOH, but phenols are not (c) phenols are soluble in NaHCO3, but alcohols are not (d) alcohols are soluble in NaHCO3, but phenols are not

Last Answer : phenols are soluble in NaOH, but alcohols are not

Which of the following show n→ ℿ * electronic transitions? a. Alcohols b. Ethers c.Alkanes d. Aldehydes

Description : Which of the following show n→ ℿ * electronic transitions? a. Alcohols b. Ethers c.Alkanes d. Aldehydes

Last Answer : d. Aldehydes

Why do alcohols have boiling points much higher than hydrocarbons of similar molecular weight? (a) Alcohols have greater van der Waals attraction forces. (b) Alcohol molecules have greater molecular symmetry. (c) Hydrogen bonds must be broken in the process of volatilization. (d) Alcohols must overcome greater ionic forces in the process of volatilization.

Description : Why do alcohols have boiling points much higher than hydrocarbons of similar molecular weight? (a) Alcohols have greater van der Waals attraction forces. (b) Alcohol molecules have greater ... of volatilization. (d) Alcohols must overcome greater ionic forces in the process of volatilization.

Last Answer : Hydrogen bonds must be broken in the process of volatilization

Assertion : Phenols are more acidic than aliphatic alcohols. Reason : Phenoxides are stabilized by resonance.

Description : Assertion : Phenols are more acidic than aliphatic alcohols. Reason : Phenoxides are stabilized by resonance.

Last Answer : Assertion : Phenols are more acidic than aliphatic alcohols. Reason : Phenoxides are stabilized by resonance. ... D. A is incorrect but R is correct

Assertion: Intermolecular dehydration is not useful for the perparation of unsymmetrical ethers from primary alcohols Reason: The reaction leads to a

Description : Assertion: Intermolecular dehydration is not useful for the perparation of unsymmetrical ethers from primary alcohols Reason: The reaction leads to a

Last Answer : Assertion: Intermolecular dehydration is not useful for the perparation of unsymmetrical ethers from primary ... . Assertion is false, Reason is true

Alcohols can be distinguished from ethers by

Description : Alcohols can be distinguished from ethers by

Last Answer : Alcohols can be distinguished from ethers by A. Sodium metal B. Ester formation C. Iodoform test D. All the above

`NH_(3) + NaOCl overset("golatin or " EDTA^(+))rarr` products The number of moles of `N - H` bonds present in one mole of the strongest nucleophile pr

Description : `NH_(3) + NaOCl overset("golatin or " EDTA^(+))rarr` products The number of moles of `N - H` bonds present in one mole of the strongest nucleophile pr

Last Answer : `NH_(3) + NaOCl overset("golatin or " EDTA^(+))rarr` products The number of moles of ... mole of the strongest nucleophile present in the product is:

`NH_(3) + NaOCl overset("golatin or " EDTA^(+))rarr` products The number of moles of `N - H` bonds present in one mole of the strongest nucleophile pr

Description : `NH_(3) + NaOCl overset("golatin or " EDTA^(+))rarr` products The number of moles of `N - H` bonds present in one mole of the strongest nucleophile pr

Last Answer : `NH_(3) + NaOCl overset("golatin or " EDTA^(+))rarr` products The number of moles of ... mole of the strongest nucleophile present in the product is:

Standard coarse threads are equally strong in failure by shear and failure by tension, if the height of nut is (A) h = 0.4 d (B) h = 0.6 d (C) h = 0.5 d (D) h = d

Description : Standard coarse threads are equally strong in failure by shear and failure by tension, if the height of nut is (A) h = 0.4 d (B) h = 0.6 d (C) h = 0.5 d (D) h = d

Last Answer : (A) h = 0.4 d

A family of organic compounds whose molecules will add water under an acid catalysis and change into alcohols are the: w) alkenes x) alkanes y) aromatic hydrocarbons z) cycloalkanes

Description : A family of organic compounds whose molecules will add water under an acid catalysis and change into alcohols are the: w) alkenes x) alkanes y) aromatic hydrocarbons z) cycloalkanes

Last Answer : ANSWER: W -- ALKENES

Is it true both ionic and covalent bonds between molecules are very strong?

Description : Is it true both ionic and covalent bonds between molecules are very strong?

Last Answer : Both ionic and covalent bonds are between atoms.

Diamond is hard because (a) It has strong covalent bonds (b) Discrete molecules of carbon are held by strong Vander Waal’s forces (c) It involves Van der Waal's forces (d) Covalent bonds are directional unlike ionic bonds

Description : Diamond is hard because (a) It has strong covalent bonds (b) Discrete molecules of carbon are held by strong Vander Waal’s forces (c) It involves Van der Waal's forces (d) Covalent bonds are directional unlike ionic bonds

Last Answer : Ans:(a)

Aldehydes undergo oxidation with KMnO4/H+ to give (a) Alcohols (b) Acetals (c) Ketones (d) Acids

Description : Aldehydes undergo oxidation with KMnO4/H+ to give (a) Alcohols (b) Acetals (c) Ketones (d) Acids

Last Answer : Acids

Thiols are alcohol analogs in which the oxygen has been replaced by sulfur (e.g., CH3SH). Given the fact that the S–H bond is less polar than the O–H bond, which of the following statements comparing thiols and alcohols is correct? (a) Hydrogen bonding forces are weaker in thiols. (b) Hydrogen bonding forces are stronger in thiols. (c) Hydrogen bonding forces would be the same. (d) No comparison can be made without additional information

Description : Thiols are alcohol analogs in which the oxygen has been replaced by sulfur (e.g., CH3SH). Given the fact that the S-H bond is less polar than the O-H bond, which of the following ... (c) Hydrogen bonding forces would be the same. (d) No comparison can be made without additional information

Last Answer : Hydrogen bonding forces are weaker in thiols.

Are alcohol's strong electrolytes?

Description : Are alcohol's strong electrolytes?

Last Answer : Alcohols are not electrolytes.

While separating a mixture of ortho and para-nitro phenols by steam distillation, name the isomer which will be steam volatile. Give reasons.

Description : While separating a mixture of ortho and para-nitro phenols by steam distillation, name the isomer which will be steam volatile. Give reasons.

Last Answer : In o-nitrophenol, there is intramolecular hydrogen bonding as follows : In p-nitrophenol, there is intramolecular hydrogen bonding as follows :   Due to intermolecular H ... -nitrophenol. Hence o-nitraphenol due to its lower b. p. is steam volatile while pnitrophenol is not.

Which one of the following compounds form zwitterions?(a) carbonyl compounds (b) amino acids (c) phenols (d) heterocyclic compounds

Description : Which one of the following compounds form zwitterions? (a) carbonyl compounds (b) amino acids (c) phenols (d) heterocyclic compounds

Last Answer : amino acids

Which of the following group of compounds is most soluble in water? w) alkanes (pron: ak-KANES) x) alcohols y) aldehydes (pron: al-deh-HIDES) z) alkenes (pron: al-KEENS)

Description : Which of the following group of compounds is most soluble in water? w) alkanes (pron: ak-KANES) x) alcohols y) aldehydes (pron: al-deh-HIDES) z) alkenes (pron: al-KEENS)

Last Answer : ANSWER: X -- ALCOHOLS

The greater acidity of carboxylic acids compared to alcohols arises primarily from : (a) the electron-donating effect of the hydroxyl group (b) the electron-withdrawing effect of the carboxyl oxygen (c) the acidity of α-hydrogens of carboxylic acids (d) the resonance stability associated with the carboxylate ion

Description : The greater acidity of carboxylic acids compared to alcohols arises primarily from : (a) the electron-donating effect of the hydroxyl group (b) the electron-withdrawing effect of the carboxyl ... of α-hydrogens of carboxylic acids (d) the resonance stability associated with the carboxylate ion

Last Answer : the resonance stability associated with the carboxylate ion

Ethers are cleaved by acids not by based. Why ?

Description : Ethers are cleaved by acids not by based. Why ? 

Last Answer : The C - O - C bond in ethers like the C - OH bond in alcohols is quite strong. In order to weaken it, the oxygen atom must be protonated. A subsequent nucleophile attack by a strong ... protonation of O atom of ether and therefore only acids can bring about the cleavage of ethers and not bases.

Soap is (a) a mixture of salts of fatty acids (b) a salt of glycerol (c) a mixture of ethers (d) a mixture of aromatic ethers

Description : Soap is (a) a mixture of salts of fatty acids (b) a salt of glycerol (c) a mixture of ethers (d) a mixture of aromatic ethers

Last Answer : a mixture of salts of fatty acids

Cyclic ethers with three-membered ring are called (a) Lactones (b) Oxiranes (c) Alkoxides (d) Epoxy resins

Description : Cyclic ethers with three-membered ring are called (a) Lactones (b) Oxiranes (c) Alkoxides (d) Epoxy resins

Last Answer : Oxiranes

Ethers react with cold concentrated H2SO4 to form (a) Oxonium salts (b) Alkenes (c) Alkoxides (d) Zwitterions

Description : Ethers react with cold concentrated H2SO4 to form (a) Oxonium salts (b) Alkenes (c) Alkoxides (d) Zwitterions

Last Answer : Oxonium salts

Ethers can be freed from peroxides by treatment with (a) Ferrous salt (b) Sodium carbonate (c) Ferric salt (d) Sodium bicarbonate

Description : Ethers can be freed from peroxides by treatment with (a) Ferrous salt (b) Sodium carbonate (c) Ferric salt (d) Sodium bicarbonate

Last Answer : Ferric salt

Ethers are stored in brown bottles. This is because on exposure to air and light ethers are converted to (a) Peroxides (b) Oxonium ions (c) Ozonides (d) Electrophiles

Description : Ethers are stored in brown bottles. This is because on exposure to air and light ethers are converted to (a) Peroxides (b) Oxonium ions (c) Ozonides (d) Electrophiles

Last Answer : Peroxides

Ethers are kept in brown bottles because (a) Brown bottles are cheaper than colorless clear bottles (b) Ethers absorb moisture(c) Ethers evaporate readily(d) Ethers are oxidized to explosive peroxides

Description : Ethers are kept in brown bottles because (a) Brown bottles are cheaper than colorless clear bottles (b) Ethers absorb moisture (c) Ethers evaporate readily (d) Ethers are oxidized to explosive peroxides

Last Answer : Ethers are oxidized to explosive peroxides

Ethers are (a) Lewis acids(b) Neutral(c) Lewis bases(d) Can not be predicted

Description : Ethers are (a) Lewis acids (b) Neutral (c) Lewis bases (d) Can not be predicted

Last Answer : Lewis bases

Name the strongest and weakest type of atomic bonds.

Description : Name the strongest and weakest type of atomic bonds.

Last Answer : Metallic bond is strongest and molecular bond also known as Vander Waals bond is weakest.

A pyrex tumbler does not crack when hot water is poured into it because pyrex (a) is a strong material (b) does not expand much on heating (c) is a good conductor of heat (d) expands equally from inside and outside

Description : A pyrex tumbler does not crack when hot water is poured into it because pyrex (a) is a strong material (b) does not expand much on heating (c) is a good conductor of heat (d) expands equally from inside and outside

Last Answer : Ans:(b)

The areas of cross-section of a square beam and a circular beam subjected to equal bending moments, are same. (A) Circular beam is more economical (B) Square beam is more economical (C) Both the beams are equally strong (D) Both the beams are equally economical

Description : The areas of cross-section of a square beam and a circular beam subjected to equal bending  moments, are same.  (A) Circular beam is more economical  (B) Square beam is more economical  (C) Both the beams are equally strong  (D) Both the beams are equally economical 

Last Answer : (B) Square beam is more economical 

Pick up the correct statement from the following: (A) Plain cement concrete is equally strong in compression as well as in tension (B) Slump test is performed to check concrete strength (C) Curing of concrete is done for proper compaction of cement (D) Fineness modulus is the index number expressing the relative sizes of both coarse and fine aggregates

Description : Pick up the correct statement from the following: (A) Plain cement concrete is equally strong in compression as well as in tension (B) Slump test is performed to check concrete strength (C ... D) Fineness modulus is the index number expressing the relative sizes of both coarse and fine aggregates

Last Answer : Option D

Reinforced cement concrete is equally strong in taking (a) Tensile and compressive stress (b) Compressive and shear stresses. (c) Tensile, compressive and shear stresses. (d) Tensile and shear stresses.

Description : Reinforced cement concrete is equally strong in taking (a) Tensile and compressive stress (b) Compressive and shear stresses. (c) Tensile, compressive and shear stresses. (d) Tensile and shear stresses.

Last Answer : (c) Tensile, compressive and shear stresses.

In the Perceptual Map each segment has a set of circles where: a. The inner fine cut circles have a radius of 4 units. b. The inner fine cut circles represent the heart of the segment where demand is strong. c. At the center of each inner fine cut circle is the ideal spot where demand is strongest. d. a and b. e. a, b and c.

Description : In the Perceptual Map each segment has a set of circles where: a. The inner fine cut circles have a radius of 4 units. b. The inner fine cut circles represent the heart of the segment where demand is strong. ... cut circle is the ideal spot where demand is strongest. d. a and b. e. a, b and c.

Last Answer : b. The inner fine cut circles represent the heart of the segment where demand is strong.

Which one of the following substances will form strong hydrogen bonds? A HCOOH B CH3CN C CCl4 D SiH4 E CH3OCH3

Description : Which one of the following substances will form strong hydrogen bonds? A HCOOH B CH3CN C CCl4 D SiH4 E CH3OCH3

Last Answer : A HCOOH

In 2-butene, which of the following bonds prevents the atoms at each end of the bond from rotating with respect to each other. Is it an: w) ionic bond x) sigma bond y) strong bond z) double bond

Description : In 2-butene, which of the following bonds prevents the atoms at each end of the bond from rotating with respect to each other. Is it an: w) ionic bond x) sigma bond y) strong bond z) double bond

Last Answer : ANSWER: Z -- DOUBLE BOND

What is the strongest force that exist between molecules of nitrogen monoxide?

Description : What is the strongest force that exist between molecules of nitrogen monoxide?

Last Answer : The strongest intermolecular forces that would exist betweenmolecules of NO would be dipole-dipole attractions. There are nohydrogen bonds formed, and so dipole-dipole would be the strongest.There will also be dispersion forces, but these are weaker thandipoles.

Who do double bonds in rubber molecules influence there structure and reactivity.

Description : Who do double bonds in rubber molecules influence there structure and reactivity.

Last Answer : Ans: Greater the number of double bound the rubber will be less reactive because of greater inter molecular forces of attraction among the monomers.

Which of these molecules is bound by ionic bonds? w) H2O x) CH4 y) NaCl z) C6H12O6

Description : Which of these molecules is bound by ionic bonds? w) H2O x) CH4 y) NaCl z) C6H12O6

Last Answer : ANSWER: Y -- NaCl

Explain why nucleophilic substitution reactions are not very common in phenols.

Description : Explain why nucleophilic substitution reactions are not very common in phenols.

Last Answer : Explain why nucleophilic substitution reactions are not very common in phenols.

Phenols does not react with

Description : Phenols does not react with

Last Answer : Phenols does not react with A. sodium bicarbonate B. sodium hydroxide C. potassium hydroxide D. ferric chloride

The smell of fat turned rancid is due to (A) Presence of vit E (B) Presence of quinones (C) Phenols (D) Volatile fatty acids

Description : The smell of fat turned rancid is due to (A) Presence of vit E (B) Presence of quinones (C) Phenols (D) Volatile fatty acids

Last Answer : Answer : D

Protein is a polymer of (A) Sugars (B) Phenols (C) Amino acids (D) Carboxylic acids

Description : Protein is a polymer of (A) Sugars (B) Phenols (C) Amino acids (D) Carboxylic acids

Last Answer : Answer : C

Phenols are added in gasoline to (A) Improve the octane number(B) Act as an antioxidant(C) Reduce its viscosity(D) Increase its pour point

Description : Phenols are added in gasoline to (A) Improve the octane number (B) Act as an antioxidant (C) Reduce its viscosity (D) Increase its pour point

Last Answer : (B) Act as an antioxidant

Explain why the water molecule has a bent shape and a bond angle less than 109.5°The electron repulsion between the two lone pairs of electrons on the oxygen of water causes the O–H bonds to squeeze close together

Description : Explain why the water molecule has a bent shape and a bond angle less than 109.5° The electron repulsion between the two lone pairs of electrons on the oxygen of water causes the O–H bonds to squeeze close together

Last Answer : The electron repulsion between the two lone pairs of electrons on the oxygen of water causes the O–H bonds to squeeze close together

I am strongest when you see me as round, but I am often viewed in other forms. I lift and drop the sea with my tremendous strength, and a man with a name like 'powerful bicep' was the first to tread on me.What am I? -Riddles

Description : I am strongest when you see me as round, but I am often viewed in other forms. I lift and drop the sea with my tremendous strength, and a man with a name like 'powerful bicep' was the first to tread on me.What am I? -Riddles

Last Answer : I am the moon.