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Test: Alcohols, Phenols & Ethers - NEET MCQ


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25 Questions MCQ Test Chemistry Class 12 - Test: Alcohols, Phenols & Ethers

Test: Alcohols, Phenols & Ethers for NEET 2024 is part of Chemistry Class 12 preparation. The Test: Alcohols, Phenols & Ethers questions and answers have been prepared according to the NEET exam syllabus.The Test: Alcohols, Phenols & Ethers MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Alcohols, Phenols & Ethers below.
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Test: Alcohols, Phenols & Ethers - Question 1

Ketones are reduced to the corresponding alcohols by catalytic hydrogenation to form

Detailed Solution for Test: Alcohols, Phenols & Ethers - Question 1

Ketones are reduced to secondary alcohols.

Test: Alcohols, Phenols & Ethers - Question 2

Which of the following reagents can be used to oxidise primary alcohols to aldehydes?

Detailed Solution for Test: Alcohols, Phenols & Ethers - Question 2

All of these are mild oxidizing agent which can oxidize alcohols to aldehyde and ketone.

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Test: Alcohols, Phenols & Ethers - Question 3

Ketones react with Grignard reagent to produce

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Test: Alcohols, Phenols & Ethers - Question 4

In the reaction

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Phenols are acidic in nature so they react with bases to form phenoxide ion.

Test: Alcohols, Phenols & Ethers - Question 5

What is the correct order of reactivity of alcohols in the following reaction?

Detailed Solution for Test: Alcohols, Phenols & Ethers - Question 5

Because 3o carbocation is most stable.

Test: Alcohols, Phenols & Ethers - Question 6

Phenol can be distinguished from ethanol by the reactions with _________.

Detailed Solution for Test: Alcohols, Phenols & Ethers - Question 6

(a), (c)

(a) Br2/water

(c) Neutral FeCl3

Test: Alcohols, Phenols & Ethers - Question 7

Primary alcohols are prepared by reduction of carboxylic acids. Though lithium aluminium hydride is a strong reducing agent, it is not used in the reaction. Because 

Detailed Solution for Test: Alcohols, Phenols & Ethers - Question 7

LiAlH4 is quite expensive.

Test: Alcohols, Phenols & Ethers - Question 8

The reaction  C2H5ONa + C2H5I → C2H5OCH5 + NaI   is known as

Detailed Solution for Test: Alcohols, Phenols & Ethers - Question 8

Rxn of sodium ethoxide with alkyl halide is known as Williamsons synthesis.

Test: Alcohols, Phenols & Ethers - Question 9

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

Detailed Solution for Test: Alcohols, Phenols & Ethers - Question 9

Here, again carbon is not chiral in nature.
So, only one alcohol is chiral in nature

Test: Alcohols, Phenols & Ethers - Question 10

Preparation of ethers by acid dehydration of secondary or tertiary alcohols is not a suitable method.

Detailed Solution for Test: Alcohols, Phenols & Ethers - Question 10

Foe the given conditions elimination domintes over substitution. And alkenes are formed.

Test: Alcohols, Phenols & Ethers - Question 11

Aldehydes are reduced to the corresponding alcohols by addition of hydrogen in the presence of catalysts to form

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Test: Alcohols, Phenols & Ethers - Question 12

Alcohols have high boiling points because of

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Alcohols have strong H bonding.

Test: Alcohols, Phenols & Ethers - Question 13

Lucas test is associated with

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Lucas test is distinguishing test for alcohols.

Test: Alcohols, Phenols & Ethers - Question 14

An organic compound containing oxygen, upon oxidation forms a carboxylic acid as the only organic product with its molecular mass higher by 14 units. The organic compound is ______.

Detailed Solution for Test: Alcohols, Phenols & Ethers - Question 14

When –CH2OH group is replaced by –COOH group then only molecular wt will increase by 14units.

Test: Alcohols, Phenols & Ethers - Question 15

The process of converting alkyl halides into alcohols involves_____________.

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Converstion of alcohol to alkyl halide is via substitution reaction.

Test: Alcohols, Phenols & Ethers - Question 16

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

Detailed Solution for Test: Alcohols, Phenols & Ethers - Question 16

The correct answer is Option A.
Phenol (C6H5OH) will react with sodium hydroxide solution in water , as phenols are more acidic than alcohols.

Test: Alcohols, Phenols & Ethers - Question 17

The reaction which involves dichlorocarbene as an electrophile is

Detailed Solution for Test: Alcohols, Phenols & Ethers - Question 17

The correct answer is Option A.

Reimer Tiemann reaction which converts phenol to ortho- hydroxybenzaldehyde involves the formation of dichlorocarbene which acts as an electrophile and attacks on the ortho position of phenol.

Test: Alcohols, Phenols & Ethers - Question 18

An organic compound X is oxidised by using acidified K2Cr2O7. The product obtained reacts with Phenyl hydrazine but does not answer silver mirror test. The possible structure of X is

Detailed Solution for Test: Alcohols, Phenols & Ethers - Question 18

Since the product of oxidation reacts with phenyl hydrazine, it is a carbonyl compound. Since it does not answer silver mirror test, it must be a ketone. Ketones are produced by the oxidation of secondary alcohols. So the compound X is isopropyl alcohol

Test: Alcohols, Phenols & Ethers - Question 19

Methyl bromide is converted into ethane by heating it in ether medium with

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Wurtz reaction.

Test: Alcohols, Phenols & Ethers - Question 20

One of the following alcohol is a poison and Ingestion of even small quantities can cause blindness and large quantities causes even death.

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Methanol is apoison and ingestion of even trace quantity can be fatal.

Test: Alcohols, Phenols & Ethers - Question 21

The starting material for picric acid is,

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Pictric acid is trinitroderivative of phenol.

Test: Alcohols, Phenols & Ethers - Question 22

Give IUPAC name of the compound given below.

Detailed Solution for Test: Alcohols, Phenols & Ethers - Question 22

The correct answer is Option C.
Given molecule:

For IUPAC nomenclature following steps are followed:
1. Identify the functional group and their priority: -OH and -Cl are the side groups in the given molecule. OH has higher priority thus the name will have the suffix "ol".
2. Identify parent chain: The longest carbon chain that contains the functional group. Here its 6 C chain i.e hexyl
3. Assign locant number: lowest number to the main functional group and side chains i.e. 2-ol 
4. Identify side chains/groups: its chloro, and 5-chloro in the given molecule.

IUPAC name is: 5-chlorohexan-2-ol
 

Test: Alcohols, Phenols & Ethers - Question 23

Phenol is less acidic than ______________.

Detailed Solution for Test: Alcohols, Phenols & Ethers - Question 23

Phenol is less acidic than O−nitrophenol. Nitro group is an electron-withdrawing group. It decreases electron density on benzene ring and delocalizes negative charge of phenoxide ion. It increases acidity. Hence, O−nitrophenol is more acidic than phenol. 

 

On the other hand, methoxy group is an electron releasing group. It increases electron density on benzene ring and does not delocalizes negative charge of phenoxide ion. It decreases acidity. Hence,  p−methoxyphenol is less acidic than phenol. Also, alcohols (2− methylpropanol and 2,2− dimethyl pentanol) are neutral.

Test: Alcohols, Phenols & Ethers - Question 24

A hydrocarbon C5H10 does not react with chlorine in dark but gives a single monochloro compound C5H9Cl in bright sunlight. The hydrocarbon is

Detailed Solution for Test: Alcohols, Phenols & Ethers - Question 24

Since monochlorinated compound is formed so that menas all the hydrogens are same.

Test: Alcohols, Phenols & Ethers - Question 25

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

Detailed Solution for Test: Alcohols, Phenols & Ethers - Question 25

RO- has more electron density.

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