Methods of Preparation of Alcohols

IMPORTANT

Methods of Preparation of Alcohols: Overview

This topic consists of various concepts like Preparation of Alcohols by Hydroboration-Oxidation of Alkenes,Methods of Preparation of Alcohols,Mechanism of Acid Catalysed Hydration of Alkenes, etc.

Important Questions on Methods of Preparation of Alcohols

HARD
IMPORTANT

Match the conversions with the reagents that are used in the process:

i. Phenol to benzoquinone a. H2O/H+
ii. Propanone to 2-methylpropan-2-ol b. Na2Cr2O7/H2SO4
iii. Propene to propan-2-ol c. CH3MgBr/H2O

HARD
IMPORTANT

An organic compound A   ( C 3 H 6 O)  on reduction forms compound B   ( C 3 H 8 O) . B reacts with HBr to form the compound C. C with Mg forms Grignard reagent D which reacts with A to form a product which on hydrolysis gives E. Identify A to E.

HARD
IMPORTANT

In the following sequence of reactions,

Question Image
The compound D is –

MEDIUM
IMPORTANT

Incorrect method of preparation for alcohols from the following is:

MEDIUM
IMPORTANT

The water gas on reacting with cobalt as a catalyst forms

HARD
IMPORTANT

How methanol is prepared from carbon monoxide?

HARD
IMPORTANT

Between 2-methyl-butan-2-ol and 2-methyl-butan-1-ol, which cannot be produced by the reduction of either an alcohol or an aldehyde? Why?

MEDIUM
IMPORTANT

What happens when Pent-1-ene is reacts with dilute sulphuric acid.

HARD
IMPORTANT

Reaction of Question Image with two equivalent of CH3MgBr followed by acidic hydrolysis forms compoundP, Dehydration of P forms compoundQ. Answer the following question on the basis of above write up.

What type of alcoholic (OH) group is present in compound (P)?

HARD
IMPORTANT

Reaction of Question Image​​​​​​​ with two equivalent of CH3MgBr followed by acidic hydrolysis forms compoundP, Dehydration of P forms compoundQ. Answer the following question on the basis of above write up.

Which simplest product is formed by reductive ozonolysis of compound Q?

HARD
IMPORTANT

How can one degree alcohol be converted to two degree alcohol without changing the number of carbon?

HARD
IMPORTANT

What is the product formed in the following reaction?

CH3-CH=CH2 (ii) H2O2, OH-(i) BH3, THFProduct

HARD
IMPORTANT

An organic compound A,C6H10O on reaction with CH3MgBr followed by acid treatment gives compound B.The compound, B on reaction with HBr gives compound, C. Identify compound A,B and C.

EASY
IMPORTANT

Identify the catalyst in the hydration of alkenes to produce alcohols.

EASY
IMPORTANT

The product 'A' of the following reaction is

COg+2H2gCuZnO-Cr2O3A

MEDIUM
IMPORTANT

The major product formed in the following reaction is

Question Image 

 iiNaOH,H2O2 iBH32

HARD
IMPORTANT

X (an ethyl ester) (ii) H3O(i) Grignard's reagent (Y) (excess) Product  

Which of the following is not a possible product?

EASY
IMPORTANT

In which of the following the adduct obtained gives n-Propyl alcohol on hydrolysis?

MEDIUM
IMPORTANT

In which of the following reactions 2-Phenylbutan-2-ol cannot be prepared?

EASY
IMPORTANT

Explain the mechanism of acid catalysed hydration of alkenes to form alcohols.