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JEE-Main - Grade 12 - Chemistry - Alcohols, Phenols and Ethers - Introduction and Snapshot of Alcohols, Phenols and Ethers - Study ref# 881

Introduction: You have learnt that substitute of one or more hydrogen atom(s) from a hydrocarbon by another atom or a group of atoms result in the formation of an entirely new compound having altogether different properties and applica... read more

JEE-Main - Grade 12 - Chemistry - Alcohols, Phenols and Ethers - Introduction and Snapshot of Alcohols, Phenols and Ethers - Study ref# 882

Following sections must be covered to understand the Alcohol Phenol and Ethers: 1. Classification 2. Nomenclature 3. Nature of C-X Bond 4. Methods of Preparation 5. Physical Properties 6. Chemical Reactions 7. Polyhalogen C... read more

JEE-Main - Grade 12 - Chemistry - Alcohols, Phenols and Ethers - Target Setup for Alcohols, Phenols and Ethers - Study ref# 883

Student requires to achieve the following milestones to get better grip over Alcohol Phenol and Ethers. The milestones / targets are as follows: Starting Point: Days 0Test TypeAppear on TestTarget TestsScorePractice Test000%Chapt... read more

JEE-Main - Grade 12 - Chemistry - Alcohols, Phenols and Ethers - Study ref# 9936

Monochlorination of toluene in sunlight followed by hydrolysis with aq. NaOH yields

a) O-cresol

JEE-Main - Grade 12 - Chemistry - Alcohols, Phenols and Ethers - Study ref# 9937

How many alcohols with molecular formula C4H10O are chiral in nature?

a) 1

JEE-Main - Grade 12 - Chemistry - Alcohols, Phenols and Ethers - Study ref# 9938

CH3CH2OH can be converted into CH3CHO by……… . a) catalytic hydrogenation b) treatment with LiAlH4 c) treatment with pyridi... read more

JEE-Main - Grade 12 - Chemistry - Alcohols, Phenols and Ethers - Study ref# 9939

Which of the following compounds is aromatic alcohol? a) A,B,C,D b) A,D c) B,C d) A Answer: (c)... read more

JEE-Main - Grade 12 - Chemistry - Alcohols, Phenols and Ethers - Study ref# 9940

Which of the following species can act as the strongest base?

(a) &nb... read more

JEE-Main - Grade 12 - Chemistry - Alcohols, Phenols and Ethers - Study ref# 9941

Which of the following compounds will react with sodium hydroxide solution in water?

(a) &nbs... read more

JEE-Main - Grade 12 - Chemistry - Alcohols, Phenols and Ethers - Study ref# 9942

Phenol is less acidic than……… .

(a) ethanol ... read more

JEE-Main - Grade 12 - Chemistry - Alcohols, Phenols and Ethers - Study ref# 9943

Mark the correct increasing order of reactivity of the following compounds with HBr/HCl.

(a) &nbs... read more

JEE-Main - Grade 12 - Chemistry - Alcohols, Phenols and Ethers - Study ref# 9944

Suggest a reagent for the following conversion. Answer: The given reactant is . it is a secondary alcohol. Secondary alcohol gives ketone when oxidises by CrO3 or pyridinium chlorochromate without carring out oxidation ... read more

JEE-Main - Grade 12 - Chemistry - Alcohols, Phenols and Ethers - Study ref# 9945

Out of o-nitro-phenol and p-nitro-phenol, which is more volatile? Answer: o-nitrophenol is more volatile than p-nitrophenol due to presence of intramolecular hydrogen bonding. in para nitrophenol intermolecular hydrogen bonding is present. T... read more

JEE-Main - Grade 12 - Chemistry - Alcohols, Phenols and Ethers - Study ref# 9946

When phenol is treated with bromine water, white precipitate is obtained. Give the structure and the name of the compound formed. Answer: When phenol is treated with bromine water, white ppt. of 2, 4, 6-tribromophenol is obtained. ... read more

JEE-Main - Grade 12 - Chemistry - Alcohols, Phenols and Ethers - Study ref# 9947

Arrange the following compounds in increasing order of activity and give a suitable explanation. Phenol, o-nitro-phenol, o-cresol Answer: Nitro group shows-I and -R effect as follows. Due to this –I and – R effect of o-ni... read more

JEE-Main - Grade 12 - Chemistry - Alcohols, Phenols and Ethers - Study ref# 9948

Arrange the following compounds in decreasing order of acidity. H2O, ROH, HC≡CH Answer: A stronger acid displaces a weaker acid from its salt. When RONa is treated with H2O, it forms ROH. So, water is a stronger acid than ROH. read more

JEE-Main - Grade 12 - Chemistry - Alcohols, Phenols and Ethers - Study ref# 9949

How can propan—32—one be converted into tert-butyl alcohol? Answer: Propan -2-one is a ketone. its structural formula is Ketones when treated with Grignard reagent give tertiary alcohols. ... read more

JEE-Main - Grade 12 - Chemistry - Alcohols, Phenols and Ethers - Study ref# 9950

Explain why nucleophilic substitution reaction are not very common in phenols? Answer: Resonance is an important factor in phenols; During resonance – OH group in phenol gives its electrons to the benzene ring. As a result of this, the elect... read more

JEE-Main - Grade 12 - Chemistry - Alcohols, Phenols and Ethers - Study ref# 9951

Preparation of alcohols from alkenes from involves the electrophilic attack on alkene carbon atom. Explain its mechanism. Answer: Preparation of alcohols from alkene by the hydration of alkenes in presence of sulphuric acid. read more

JEE-Main - Grade 12 - Chemistry - Alcohols, Phenols and Ethers - Study ref# 9952

Explain why is O=C=O non-polar while R—O—R is polar? Answer: CO2 is a linear molecule. The dipole moment of two C=O bonds are equal and opposite and they cancel each other and hence the dipole moment of CO2 is zero and it is a non-polar m... read more

JEE-Main - Grade 12 - Chemistry - Alcohols, Phenols and Ethers - Study ref# 9953

Why is the reactivity of all the three classes of alcohols with conc. HCl and ZnCl2 (Lucas reagent) different? Answer: The reaction of alcohols with lucas reagent (conc. HCl and ZnCl2) follow SN1 mechanism. SN1 mechanism depends upon the sta... read more

JEE-Main - Grade 12 - Chemistry - Alcohols, Phenols and Ethers - Study ref# 9954

Write steps to carry out the conversion of phenol to aspirin. Answer: Aspirin can be prepared by the reaction of salicylic with acetic anhydride. Salicylic acid is prepared by the reaction of phenol with CO2 and NaOH. This process is know... read more

JEE-Main - Grade 12 - Chemistry - Alcohols, Phenols and Ethers - Study ref# 9955

In Kolbe’s reaction, instead of phenol, phenoxide ion is treated with carbon dioxide. Why? Answer: In phenoxide ion, the ability to give lone pair of electrons to the benzene ring is more in comparison to phenols. Therefore, the reactivity o... read more

JEE-Main - Grade 12 - Chemistry - Alcohols, Phenols and Ethers - Study ref# 9956

Dipole moment of phenol is smaller than that of methanol. Why? Answer: Dipole moment depends upon the polarity of bonds. Higher the polarity of bonds in molecule. Higher will be its dipole moment. In phenol carbon is SP2 hybridised and due t... read more

JEE-Main - Grade 12 - Chemistry - Alcohols, Phenols and Ethers - Study ref# 9957

Why is the C—O—H bond angle in alcohols slightly less than the tetrahedral angle whereas the C—O—C bond angle in ether is slightly greater? Hint To solve this question, it should keep in mind that the order of repulsion betwe... read more

JEE-Main - Grade 12 - Chemistry - Alcohols, Phenols and Ethers - Study ref# 9958

Explain why p-nitrophenol is more acidic than phenol? Answer: Nitro group of phenol produces –I and –R effect. Because of these two effects — NO2 group is electron withdrawing in nature. So, the electron density in the O—H bond of p-nitrophe... read more

JEE-Main - Grade 12 - Chemistry - Alcohols, Phenols and Ethers - Study ref# 9959

The carbon –oxygen bond in phenol is slightly stronger than that in methanol. Why? Answer: Positive resonance effect is observed in phenols. Due to this + R effect, lone pair of electrons of –OH group are in conjugation with π electrons... read more

JEE-Main - Grade 12 - Chemistry - Alcohols, Phenols and Ethers - Study ref# 9960

Explain a process in which a biocatalyst is used in industrial preparation of a compound known to you. Answer: Enzymes are biocatalysts. These biocatalysts (enzymes) are used in industrial preparation of ethanol. Ethanol is prepared by the f... read more

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