Alcohols, Phenols and Ethers

____is known as ‘wood spirit’.

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Methanol was prepared by destructive distillation of wood. Hence, methanol is known as ‘wood spirit’.

Ether in air forms:

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Ether exists as peroxide in air.

In alcohols, the oxygen of the –OH group is attached to carbon by a ____ bond formed by the overlap of an sp3 hybridized orbital of carbon with an sp3 hybridized orbital of ____ .

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Carbon and oxygen are connected by a sp3 hybridized single bond with each other. All the single bonds are sigma (σ) bonds. Hence, in alcohols, the oxygen of the –OH group is attached to carbon by a sigma(σ) bond formed by the overlap of an sp3 hybridized orbital of carbon with an sp3 hybridized orbital of oxygen.

An alcohol has one or more hydroxyl (-OH) group(s) directly attached to carbon atom(s) of a ____system, while a phenol has –OH group(s) attached to carbon atom(s) of a ____system.

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An alcohol has one or more hydroxyl (-OH) group(s) directly attached to carbon atom(s) of an aliphatic system, while a phenol has –OH group(s) attached to carbon atom(s) of an aromatic system.

To distinguish between the three classes of alcohols, ____test is performed.

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To distinguish between the three classes of alcohols, Lucas test is performed. Alcohols are soluble in Lucas reagent (concentrated HCl and ZnCl2), while their halides are immiscible and produce turbidity in solution. Tertiary alcohols produce turbidity immediately as they form halides easily. Primary alcohols do not produce turbidity at room temperature.

Cresol has

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Cresol has phenolic group - OH

If both the alkyl groups of ether are same, the prefix ____is added before the alkyl group.

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If both the alkyl groups of ether are same, the prefix di is added before the alkyl group. For example, C2H5OC2H5(diethylether).

Ethers are slightly polar. The ____ bond angle in the functional group is about 110°.

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Ethers are slightly polar. The C-O-C bond angle in the functional group is about 110°.

Alcohols and phenols are formed when a ____atom in an aliphatic and aromatic hydrocarbon is replaced by____ group.

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Alcohols and phenols are formed when a hydrogen (H) atom in an aliphatic and aromatic hydrocarbon is replaced by a hydroxyl (-OH) group.

The reaction given below is known as C2H5ONa + IC2H5→C2H5OC2H5+ Nal

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Preparation of ethers by reacting sodium ethoxide with alkyl halide is called Williamson synthesis.

Commercial alcohol is made unfit for drinking by two of the following methods by adding: 1. silver nitrate, 2. copper sulphate, 3. Pyridine, 4. iodine. The two correct methods are __________ .

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Commercial alcohol is made unfit for drinking by adding copper sulphate to give it colour and by adding pyridine which is a foul smelling liquid. This procedure is known as denaturation of alcohol.

Which of the following will not form Phenol or phenoxide:

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Benzoic acid (C6H5COOH) will not form phenol or phenoxide.

Methanol is a commercially important alcohol. All other facts given here about alcohols other than ___ are true.

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Methanol is highly poisonous. Ingestion of even small quantity of methanol can cause blindness and large quantity causes death! Hence, the incorrect statement is, 'Ingestion of large quantity of methanol can help in improving life span'.

Phenol is also known as____.

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Phenol is also known a carbolic acid. It was first isolated in the early nineteenth century from coal tar.

When vapours of an alcohol are passed over hot reduced copper, alcohol is converted into alkene, the alcohol is

Please select 2 correct answers

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A tertiary alcohol having no oxidisable hydrogen linked to carbon atom bearing hydroxyl group, is stable to oxidation.

The boiling points of alcohols and phenols ____with ____ in the number of carbon atoms.

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Boiling points of alcohols and phenols increase with increase in the number of carbon atoms. Every additional carbon atom means addition in alcohol or phenol molecules resulting in the increase intermolecular van der Waals forces. These forces need high temperatures to overcome them from breaking.

The common name of the ether C6H5OCH2CH3, is ____.

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The common name of the ether given is Ethylphenyl ether. The R of –OR is ethyl group and a phenyl group is attached to it. Therefore, the common name is Ethylphenyl ether. Alphabetically also, it is correct.

Other than ____, all other options provide source for commercial production of ethanol.

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Sweet potato is not used as a source for making ethanol commercially.

The cleavage of ethers takes place with ____ HI or HBr at ____temperature.

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The cleavage of ethers takes place with concentrated HI or HBr at high temperature. The reaction takes place with HBr or HI because these reagents are sufficiently acidic. R-O-R + HX → RX + ROH. Ethers with two different alkyl groups are also cleaved in the same manner as follows: R-O-R’ + HX → R-X + R’-OH.

To prepare tertiary alkyl-alkyl ether, one must take an alkyl halide with____, ____.

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To prepare tert alkyl-alkyl ether, one must take an alkyl halide with tertiary alkoxide as given in the equation below. CH3CI + (CH3)3CONa → (CH3)3COCH3 + NaCI.

Butane-2-ol is

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CH3CH2CH(OH)CH3-a secondary alcohol.

The common name of the compound C6H5O(CH2)6-CH3,is ____.

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The common name of the compound is Heptylphenyl ether. Note that the R of the –OR group is heptane (C7H16), therefore parent group. So, heptyl comes first, followed by phenyl and ending in ‘ether’, as it is a common name.

The Ullmann condensation is similar to the Williamson method except that the substrate is a ____halide. Such reactions generally require a catalyst, such as____.

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The Ullmann condensation is similar to the Williamson method except that the substrate is an aryl halide. Such reactions generally require a catalyst, such as copper.

The properties of alcohols and phenols are chiefly due to the presence of ____. The nature of alkyl and aryl groups simply modifies these properties.

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The properties of alcohols and phenols are chiefly due to the presence of –OH group. The nature of alkyl and aryl groups simply modifies these properties.

In Friedel-Crafts reaction, anisole reacts with ____in presence of ____ to produce ortho and para-methoxy toluene.

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In Friedel-Crafts reaction, anisole reacts with methyl chloride in presence of anhydrous aluminium chloride to produce ortho and para-methoxy toluene. This reaction is so called after the persons who first synthesised it i.e. by Charles Friedel and James Craft in 1877.

In the reduction R- CHO + H2→RCH2OH, the catalyst used is:

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Any one of Ni, Pt or Pd can be used in the reduction of aldehydes.

Ethanol is obtained commercially by fermentation. All facts about the fermentation given below are true except ____.

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Carbon dioxide is released during fermentation, oxygen is forbidden during fermentation. Anaerobic means without oxygen.

Phenols do not react with one of the following:

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Phenol does not react with NaHCO3.

The substitution of a hydrogen atom in a hydrocarbon by a ____or____ group yields compounds known as ethers.

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The substitution of a hydrogen atom in a hydrocarbon by an alkoxy (R-O) or aryloxy (Ar-O) group yields compounds known as ethers. For example CH3OCH3(dimethylether). In this compound, a hydrogen atom of methane (a hydrocarbon) is replaced by a -OCH3 group.

An example of a compound with functional group –O– is:

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Ethers contain the functional group –O–

Class 12th Chemistry - 11 Alcohols, Phenols and Ethers MCQs
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Class 12th Chemistry - 11 Alcohols, Phenols and Ethers MCQs