Test: Previous Year Questions: Alcohols

10 Questions MCQ Test Chemistry Class 12 | Test: Previous Year Questions: Alcohols

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Maximum dehydration takes place that of



Dehydrated product will be conjugated with −C=O that's why more tendency and as carbocation is more stable further to C=O that's why (b)   


When CH2=CHCOOH is reduced with LiAlH4, the compound obtained will be  



The correct answer is option D
LiAlH4​ can reduce the carboxylic acid group without affecting the double bond because alkene is electron-rich species.


Among the following compounds which can be dehydrated very easily?


The ease of dehydration of alcohols is tertiary > secondary > primary according to the order of stability of the carbocations.

The more stable carbocation is generated, thus more easily it will be dehydrated.


For which of the following parameters the structural isomers C2H5OH and CH3OCH3 would be expected to have the same values ? (Assume ideal behaviour)  



Vapor density = Molecular weight/2

As both the compounds have same molecular weights, both will have the same vapour density. Hence, gaseous density of both ethanol and dimethyl ether would be same under identical conditions of temperature and pressure. The rest of these three properties; Vapour pressure, boiling point and heat of vaporization will differ as ethanol has hydrogen bonding whereas ether does not.


HBr reacts with CH2 = CH – OCH3 under anhydrous conditions at room temperature to give 


Methyl vinyl ether is a very reactive gas. It is hydrolysed rapidly by dilute acids at room temperature to give methanol and aldehyde. However, under anhydrous conditions at room temperature, it undergoes many addition reactions at the double bond.

Electrophilic addition reaction more favourable.


In the following sequence of reactions, CH3CH2OHD, then compound `D' is -

[AIEEE 2007]


Correct Answer is option C
When ethanol is treated with a mixture of phosphorus and iodine, ethyl iodide CH3​CH2​I is obtained. 
Compound A on reaction with Mg metal in ether forms ethyl magnesium iodide CH3​CH2​ MgI. 
The compound B reacts with formaldehyde to form compound C; CH3​CH2​−CH2​−OMgX which on hydrolysis gives n propyl alcohol CH3​CH2​CH2​−OH.
The compound D is n-propyl alcohol. 
Hence, option C is correct.


A liquid was mixed with ethanol and a drop of concentrated H2SO4 was added. A compound with a fruity smell was formed. The liquid was  

[AIEEE 2009]


The fruity smell is evolved due to the formation of ester when ethanol and acid are treated in the presence of concentrated H2​SO4​.
The reaction is


From amongst the following alcohols the one that would react fastest with conc, HCl and anhydrous  is

[AIEEE 2010]


A mixture of conc.HCl and anhydrous ZnCl2

 is called Lucas reagent.
Primary alcohols react with Lucas reagent very slowly on heating to give alkyl chlorides.
Secondary alcohols react with Lucas reagent much faster.
Tertiary alcohols instantaneously react with HCl at room temperature.
Note: Lucas reagent is required for primary and secondary alcohol only.


The main product of the following reaction is


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Whenever dehydration can form two different alkenes major product is formed according to sides of rule that is more substituted alkene or alkene having lesson number of hydrogen atoms on the to double bonded carbon atoms is the major product. 

Such reactions which can produce two or more structural isomers but one of them in Greater amount than the others are called ratio selective encasa reaction is hundred percent regioselective it is termed as reduce specific

In addition to being reduced selective alcohol dehydration are stereoselective reaction in which a single starting material can yield two or more stereoisomeric products but give one of them in Greater amount than any other


Consider the following reaction :

C2H5OH + H2SO4 → Product Among the following which one cannot be formed as a product under any conditions ?

[AIEEE 2011]