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Retro (Past 13 Year)JEE Main (Alcohols Phenols And Ethers) - JEE MCQ


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12 Questions MCQ Test - Retro (Past 13 Year)JEE Main (Alcohols Phenols And Ethers)

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Retro (Past 13 Year)JEE Main (Alcohols Phenols And Ethers) - Question 1

The most suitable reagent for the conversion of 

(JEE Main 2014)

Detailed Solution for Retro (Past 13 Year)JEE Main (Alcohols Phenols And Ethers) - Question 1

Mild oxidising agents like PCC (Pyridinium chlorochromate) are particularly used for the conversion of 

Retro (Past 13 Year)JEE Main (Alcohols Phenols And Ethers) - Question 2

An unknown alcohol is treated with the ‘Lucas reagent' to determine whether the alcohol is primary, secondary or tertiary. Which alcohol reacts fastest and by what mechanism?

(JEE Main 2013)

Detailed Solution for Retro (Past 13 Year)JEE Main (Alcohols Phenols And Ethers) - Question 2

The reaction of alcohol with Lucas reagent is mostly SN1 reaction and the rate of reaction is directly proportional to the stability of carbocation formed in the reaction.
Since, 3° R—OH forms 3° carbocation (most stable) hence, it will react fastest by SN1 reaction.

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Retro (Past 13 Year)JEE Main (Alcohols Phenols And Ethers) - Question 3

Consider the follow ing reaction, 

Among the following, which one cannot be formed as a product under any conditions? 

(AIEEE 2011)

Detailed Solution for Retro (Past 13 Year)JEE Main (Alcohols Phenols And Ethers) - Question 3


Options (a), (b) and (d) may be formed but option (c) is never formed.

Retro (Past 13 Year)JEE Main (Alcohols Phenols And Ethers) - Question 4

From amongst the following alcohols the one that would react fastest with conc. HCI and anhydrous ZnCI2 is

Detailed Solution for Retro (Past 13 Year)JEE Main (Alcohols Phenols And Ethers) - Question 4

The reaction of alcohol with cone. HCI and anhydrous ZnCI2 follows SN1 pathway, so greater the stability of carbocation formed, faster is the reaction,2-methylpropan-2-ol gives 3° carbocation. Hence, it reacts rapidly with cone. HCI and anhydrous ZnCI2 (Lucas reagent).

Retro (Past 13 Year)JEE Main (Alcohols Phenols And Ethers) - Question 5

The main product of the following reaction is 

(AIEEE 2010)

Detailed Solution for Retro (Past 13 Year)JEE Main (Alcohols Phenols And Ethers) - Question 5



Retro (Past 13 Year)JEE Main (Alcohols Phenols And Ethers) - Question 6

In the following sequence of reactions, 

the compound D is 

Detailed Solution for Retro (Past 13 Year)JEE Main (Alcohols Phenols And Ethers) - Question 6


Retro (Past 13 Year)JEE Main (Alcohols Phenols And Ethers) - Question 7

Among the following the one that gives positive iodoform test upon reaction with I2 and NaOH is

(AIEEE 2006)

Detailed Solution for Retro (Past 13 Year)JEE Main (Alcohols Phenols And Ethers) - Question 7

For positive iodoform test, alcohol molecule must have 

Thus, iodoform test is given by only (d) while others will not give this test.

Retro (Past 13 Year)JEE Main (Alcohols Phenols And Ethers) - Question 8

Acid catalysed hydration of alkenes except ethene leads to the formation of

(AIEEE 2005)

Detailed Solution for Retro (Past 13 Year)JEE Main (Alcohols Phenols And Ethers) - Question 8

Hydration of ethene gives 1° alcohol (ethanol) while all other alkenes give either 2° or 3° alcohols.



Retro (Past 13 Year)JEE Main (Alcohols Phenols And Ethers) - Question 9

Among the following compounds which can be dehydrated very easily?

(AIEEE 2004)

Detailed Solution for Retro (Past 13 Year)JEE Main (Alcohols Phenols And Ethers) - Question 9

Dehydration of alcohol is in the order 1°< 2° < 3°
Thus (c), a 3° alcohol is dehydrated very easily.

Retro (Past 13 Year)JEE Main (Alcohols Phenols And Ethers) - Question 10

An ether is more volatile than an alcohol having the same molecular formula. This is due to

Detailed Solution for Retro (Past 13 Year)JEE Main (Alcohols Phenols And Ethers) - Question 10

Alcohol has polar H which makes intermolecular H-bondin g possible. Ether is non-polar, hence has no H-bonding. Lack of H-bonding in ether makes it more volatile than alcohol.

Retro (Past 13 Year)JEE Main (Alcohols Phenols And Ethers) - Question 11

During dehydration of alcohols to alkenes by heating with concentrated H2SO4 the initiation step is

(AIEEE 2003)

Detailed Solution for Retro (Past 13 Year)JEE Main (Alcohols Phenols And Ethers) - Question 11

Protonation of —OH is first step. It involves conversion of poor leaving group (—OH)  into good leaving group 

Retro (Past 13 Year)JEE Main (Alcohols Phenols And Ethers) - Question 12

Maximum dehydration takes place in that of

(AIEEE 2002)

Detailed Solution for Retro (Past 13 Year)JEE Main (Alcohols Phenols And Ethers) - Question 12

Dehydration takes place with the formation of more stable carbocation. Among the given compounds, only compound (b) forms conjugated carbocation. Thus, maximum amount of dehydration takes place in compound (b).

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