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

Assertion (A): Alkyl aryl ethers on reaction with HI give alkyl iodide phenols Reason (R): Aryl - oxygen bond is weaker than alkyl oxygen bond
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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
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Assertion: Bond angle at oxygen in ethehers is greater than ideal tetrahedral angle Reason: Stearic hindrance between alkyl groups increase bond angle

Description : Assertion: Bond angle at oxygen in ethehers is greater than ideal tetrahedral angle Reason: Stearic hindrance between alkyl groups increase bond angle

Last Answer : Assertion: Bond angle at oxygen in ethehers is greater than ideal tetrahedral angle Reason: Stearic ... D. Assertion is false, Reason is true

Aryl halides are less reactive towards nucleophilic substitution as compared to alkyl halides due to (a) Inductive effect (b) Resonance stabilization (c) Tautomerism (d) Stereoisomerism

Description : Aryl halides are less reactive towards nucleophilic substitution as compared to alkyl halides due to (a) Inductive effect (b) Resonance stabilization (c) Tautomerism (d) Stereoisomerism

Last Answer : Resonance stabilization

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

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

Last Answer : Phenols

Assertion: (A) Ethers are relatively inert when compared to `C_(2)H_(5)OH` Reason (R): The hybridization of C and O in `CH_(3)-O-CH_(3) is SP^(3)`

Description : Assertion: (A) Ethers are relatively inert when compared to `C_(2)H_(5)OH` Reason (R): The hybridization of C and O in `CH_(3)-O-CH_(3) is SP^(3)`

Last Answer : Assertion: (A) Ethers are relatively inert when compared to `C_(2)H_(5)OH` Reason (R): The hybridization of ... R is false D. A is false but R is true

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

Addition of `HI` on the double bond of propene yields isopropyl iodide and not n-propyl iodide as the major product. This is because the addition proc

Description : Addition of `HI` on the double bond of propene yields isopropyl iodide and not n-propyl iodide as the major product. This is because the addition proc

Last Answer : Addition of `HI` on the double bond of propene yields isopropyl iodide and not n-propyl iodide as the ... D. none of the above is a correct statement

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 (A) Both rhombic and monoclinic sulphur exist as `S_(8)` but oxygen exists as `O_(2)`. Reason (R ) Oxygen forms `ppi-ppi` multiple bond due

Description : Assertion (A) Both rhombic and monoclinic sulphur exist as `S_(8)` but oxygen exists as `O_(2)`. Reason (R ) Oxygen forms `ppi-ppi` multiple bond due

Last Answer : Assertion (A) Both rhombic and monoclinic sulphur exist as `S_(8)` but oxygen exists as `O_ ... Statement-I is not correct and Statement-II is correct

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.

Assertion: `p`-nitrophenol is a stronger acid than `o`-nitrophenol. Reason: Intramolecular hydrogen bonding makes the `o`-isomer weaker than the `p-`i

Description : Assertion: `p`-nitrophenol is a stronger acid than `o`-nitrophenol. Reason: Intramolecular hydrogen bonding makes the `o`-isomer weaker than the `p-`i

Last Answer : Assertion: `p`-nitrophenol is a stronger acid than `o`-nitrophenol. Reason: Intramolecular hydrogen bonding ... D. A is incorrect but R is correct

Assertion: Phosphorus tribromide is ofter preferred as a reagent for the transformation of an alcohol to the corresponding alkyl bromide Reason: The n

Description : Assertion: Phosphorus tribromide is ofter preferred as a reagent for the transformation of an alcohol to the corresponding alkyl bromide Reason: The n

Last Answer : Assertion: Phosphorus tribromide is ofter preferred as a reagent for the transformation of an alcohol to ... D. Assertion is false, Reason is true

Which of the following statements concerning SN2 reactions of alkyl halides is not correct? (a) The rate of reaction depends on the concentration of the nucleophile. (b) The rate of reaction depends on the concentration of the alkyl halide. (c) The rate of reaction of a particular alkyl bromide depends on the steric accessibility of the carbon of the C-Br bond. (d) All alkyl iodides react more rapidly than all alkyl chlorides

Description : Which of the following statements concerning SN2 reactions of alkyl halides is not correct? (a) The rate of reaction depends on the concentration of the nucleophile. (b) The rate of reaction depends on the ... carbon of the C-Br bond. (d) All alkyl iodides react more rapidly than all alkyl chlorides

Last Answer : All alkyl iodides react more rapidly than all alkyl chlorides

`C-O-C` bond in ethers can be cleaved by

Description : `C-O-C` bond in ethers can be cleaved by

Last Answer : `C-O-C` bond in ethers can be cleaved by A. `KMnO_(4)` B. `LiAlH_(4)` C. KOH D. HI

Diethyl ether on heating with excess concentrated HI gives (a) Methyl iodide (b) Isopropyl iodide (c) Ethyl iodide (d) n-Propyl iodide

Description : Diethyl ether on heating with excess concentrated HI gives (a) Methyl iodide (b) Isopropyl iodide (c) Ethyl iodide (d) n-Propyl iodide

Last Answer : Ethyl iodide

Compound P on treatement with `CH_(2)N_(2)` (diazomethane) produces compound Q. compound Q on reaction with Hl produces two alkyl iodides R and S . Al

Description : Compound P on treatement with `CH_(2)N_(2)` (diazomethane) produces compound Q. compound Q on reaction with Hl produces two alkyl iodides R and S . Al

Last Answer : Compound P on treatement with `CH_(2)N_(2)` (diazomethane) produces compound Q. compound Q on reaction ... 2-methyl-2-propanol D. 2-methyl-1-propanol

Pick up the correct statement from the following: (A) Illite bond is weaker than Kaolinite bond (B) Illite bond is stronger than montmorillonite bond (C) Illite does not swell when wet (D) All the above

Description : Pick up the correct statement from the following: (A) Illite bond is weaker than Kaolinite bond (B) Illite bond is stronger than montmorillonite bond (C) Illite does not swell when wet (D) All the above

Last Answer : Answer: Option D

Name the members of aryl group.

Description : Name the members of aryl group.

Last Answer : Compounds containing benzene ring are aryl group.

Aryl benzene sulphonate (ABS) is a (A) Detergent (B) Plasticiser for unsaturated polyester (C) Starting material for the synthesis of glycerine (D) Coating ingredient for photographic film

Description : Aryl benzene sulphonate (ABS) is a (A) Detergent (B) Plasticiser for unsaturated polyester (C) Starting material for the synthesis of glycerine (D) Coating ingredient for photographic film

Last Answer : (A) Detergent

Which of the following best describes the carbon-chlorine bond of an alkyl chloride? (a) nonpolar; no dipole (b) polar; δ+ at carbon and δ– at chlorine (c) polar; δ– at carbon and δ+ at chlorine (d) ionic

Description : Which of the following best describes the carbon-chlorine bond of an alkyl chloride? (a) nonpolar; no dipole (b) polar; δ+ at carbon and δ– at chlorine (c) polar; δ– at carbon and δ+ at chlorine (d) ionic

Last Answer : polar; δ+ at carbon and δ– at chlorine

Which of the following statements is correct for a saturated alkyl halide? (a) the C–X bond results from overlap of the s orbital of carbon and the p orbital of the halogen (X) (b) the C–X bond results from overlap of the p orbital of carbon and the p orbital of the halogen (X) (c) the C–X bond results from overlap of the sp3 orbital of carbon and the p orbital of the halogen (X) (d) the C–X bond results from overlap of the sp2 orbital of carbon and the p orbital of the halogen (X)

Description : Which of the following statements is correct for a saturated alkyl halide? (a) the C-X bond results from overlap of the s orbital of carbon and the p orbital of the halogen (X) (b) the C-X bond ... the C-X bond results from overlap of the sp2 orbital of carbon and the p orbital of the halogen (X)

Last Answer : the C–X bond results from overlap of the sp3 orbital of carbon and the p orbital of the halogen (X)

Assertion `(A) :` Hydrogen bomb is more powerful than atomic bomb. Reason `(R) :` In hydrogen bomb, fusion reaction is initiated. a)If both `(A)` and

Description : Assertion `(A) :` Hydrogen bomb is more powerful than atomic bomb. Reason `(R) :` In hydrogen bomb, fusion reaction is initiated. a)If both `(A)` and

Last Answer : Assertion `(A) :` Hydrogen bomb is more powerful than atomic bomb. Reason `(R) :` In hydrogen bomb, fusion ... D. If both (A) and (R ) are incorrect.

Assertion (A): There is no reaction known for which `DeltaG` is positive, yet it is spontaneous. Reason (R ) : For photochemical reaction, `DeltaG` is

Description : Assertion (A): There is no reaction known for which `DeltaG` is positive, yet it is spontaneous. Reason (R ) : For photochemical reaction, `DeltaG` is

Last Answer : Assertion (A): There is no reaction known for which `DeltaG` is positive, yet it is spontaneous. ... False. D. If both Assertion & Reason are false.

Assertion (A): Diethyl ether reacts with hot Conc `H_(2)SO_(4)` and gives ethyl hydrogen sulphate Reason (R): The reaction involves cleavage of C-O bo

Description : Assertion (A): Diethyl ether reacts with hot Conc `H_(2)SO_(4)` and gives ethyl hydrogen sulphate Reason (R): The reaction involves cleavage of C-O bo

Last Answer : Assertion (A): Diethyl ether reacts with hot Conc `H_(2)SO_(4)` and gives ethyl hydrogen sulphate Reason (R ... R is false D. A is false but R is true

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.

Assertion :- Bond Dissociation energy is `F_(2) gt Cl_(2)` Reason:- `Cl_(2)` have more electronic repulsion than `F_(2)`.

Description : Assertion :- Bond Dissociation energy is `F_(2) gt Cl_(2)` Reason:- `Cl_(2)` have more electronic repulsion than `F_(2)`.

Last Answer : Assertion :- Bond Dissociation energy is `F_(2) gt Cl_(2)` Reason:- `Cl_(2)` have more ... is False. D. If both Assertion & Reason are false

Assertion:Among chalcogens, catenation tendency is maximum for sulphur Reason: S-S bond is stronger than O - O single bond.

Description : Assertion:Among chalcogens, catenation tendency is maximum for sulphur Reason: S-S bond is stronger than O - O single bond.

Last Answer : Assertion:Among chalcogens, catenation tendency is maximum for sulphur Reason: S-S bond is stronger ... is not correct and Statement-II is correct

(A) Allyl free radical is more stable than simple alkyl free radical. (R) The allyl free radical is stabilized by resonance.

Description : (A) Allyl free radical is more stable than simple alkyl free radical. (R) The allyl free radical is stabilized by resonance.

Last Answer : (A) Allyl free radical is more stable than simple alkyl free radical. (R) The allyl free radical is ... IF (A) is incorrect but (R) is correct.

Presence of non-biodegradable substances, like alkyl benzene sulphonate (ABS) from the detergents in polluted water stream causes (A) Fire hazards (B) Explosion hazards (C) Persistent foam (D) Depletion of dissolved oxygen

Description : Presence of non-biodegradable substances, like alkyl benzene sulphonate (ABS) from the detergents in polluted water stream causes (A) Fire hazards (B) Explosion hazards (C) Persistent foam (D) Depletion of dissolved oxygen

Last Answer : (C) Persistent foam

“To call woman the weaker sex is a libel; it is man's injustice to woman...if nonviolenceis the law of our being, the future is with woman. Who can make a more effective appeal to the heart than woman?” this statement is made by a. B.R. Ambedkar. b. Karl Marx. c. Mahatma Gandhi. d. None of the above.

Description : To call woman the weaker sex is a libel; it is man's injustice to woman...if nonviolenceis the law of our being, the future is with woman. Who can make a more effective appeal to the heart than woman? this ... is made by a. B.R. Ambedkar. b. Karl Marx. c. Mahatma Gandhi. d. None of the above.

Last Answer : c. Mahatma Gandhi.

Assertion `:` Removal of gall bladder does affect the protein digestion. Reason `:` Bile juice break the peptide bond.

Description : Assertion `:` Removal of gall bladder does affect the protein digestion. Reason `:` Bile juice break the peptide bond.

Last Answer : Assertion `:` Removal of gall bladder does affect the protein digestion. Reason `:` Bile juice break ... . D. If both Assertion & Reason are false.

Assertion `:` Pancreatic amylase digest protein to amino acid. Reason `:` Pancreatic amylase breaks the peptide bond of protein.

Description : Assertion `:` Pancreatic amylase digest protein to amino acid. Reason `:` Pancreatic amylase breaks the peptide bond of protein.

Last Answer : Assertion `:` Pancreatic amylase digest protein to amino acid. Reason `:` Pancreatic amylase breaks the ... D. If both Assertion & Reason are false.

Assertion : In aDNA molecule, A-T rich parts melt before G-C rich parts. Reason : In between A and T there are three H-bond, whereas in between G and

Description : Assertion : In aDNA molecule, A-T rich parts melt before G-C rich parts. Reason : In between A and T there are three H-bond, whereas in between G and

Last Answer : Assertion : In aDNA molecule, A-T rich parts melt before G-C rich parts. Reason : In between A ... false. D. If both assertion and reason are false.

Assertion :- Bond order of `O_(2)` and BN is same . Reason `O_(2) and BN` are isoelectronic

Description : Assertion :- Bond order of `O_(2)` and BN is same . Reason `O_(2) and BN` are isoelectronic

Last Answer : Assertion :- Bond order of `O_(2)` and BN is same . Reason `O_(2) and BN` are isoelectronic ... is False. D. If both Assertion & Reason are false

Assertion: The O - O bond lengths in ozone molecule are intermediate between single and double bonds. Reason: `O_(3)` molecule is a resonance hybrid.

Description : Assertion: The O - O bond lengths in ozone molecule are intermediate between single and double bonds. Reason: `O_(3)` molecule is a resonance hybrid.

Last Answer : Assertion: The O - O bond lengths in ozone molecule are intermediate between single and double bonds. ... I is not correct and Statement-II is correct

The chemical reaction between Hydrogen sulphide and iodine to give Hydrogen iodide and sulphur is given below: The oxidizing and reducing agents involved in this redox reaction are: (a) Iodine and sulphur respectively (b) Iodine and hydrogen sulphide respectively (c) Sulphur and iodine respectively (d) Hydrogen sulphide and sulphur

Description : The chemical reaction between Hydrogen sulphide and iodine to give Hydrogen iodide and sulphur is given below: The oxidizing and reducing agents involved in this redox reaction are: (a) ... and hydrogen sulphide respectively (c) Sulphur and iodine respectively (d) Hydrogen sulphide and sulphur

Last Answer : (b) Iodine and hydrogen sulphide respectively

Mercaptans is represented as (where R and R' are alkyl groups) (A) R-COOH (B) R-S-H (C) R-S-R (D) R-S-R'

Description : Mercaptans is represented as (where R and R' are alkyl groups) (A) R-COOH (B) R-S-H (C) R-S-R (D) R-S-R'

Last Answer : (B) R-S-H

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.

In protolytic reactions in which the reactants are much stronger as an acid and a base than the products, the proton transfer reaction: w) does not occur x) approaches completeness y) produces a much stronger acid and a much weaker base z) produces a much weaker acid and a much stronger base

Description : In protolytic reactions in which the reactants are much stronger as an acid and a base than the products, the proton transfer reaction: w) does not occur x) approaches completeness y) produces a much stronger acid and a much weaker base z) produces a much weaker acid and a much stronger base

Last Answer : ANSWER: X -- APPROACHES COMPLETENESS

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

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.

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 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 alkane is synthesised from single alkyl halide by wurtz reaction:-

Description : Which of the following alkane is synthesised from single alkyl halide by wurtz reaction:-

Last Answer : Which of the following alkane is synthesised from single alkyl halide by wurtz reaction:- A. B. C. D.

The order of reactivities of the following alkyl halides for a `S_(N^(2))` reaction is :

Description : The order of reactivities of the following alkyl halides for a `S_(N^(2))` reaction is :

Last Answer : The order of reactivities of the following alkyl halides for a `S_(N^(2))` reaction is : A. RF > RCl > RBr > ... RBr > RF > RI D. RI > RBr > RCl > RF

. Hunsdiecker reaction is used for the preparation of (a) Alkyl chlorides and bromides (b) Alkyl nitrates and nitrites (c) Ketenes (d) Alcohols

Description : . Hunsdiecker reaction is used for the preparation of (a) Alkyl chlorides and bromides (b) Alkyl nitrates and nitrites (c) Ketenes (d) Alcohols

Last Answer : Alkyl chlorides and bromides