Answer
Verified
449.4k+ views
Hint: We will need to convert $-C{{H}_{2}}OH$ group of benzyl alcohol into –COOH group to complete this reaction. This is a simple oxidation reaction. An inorganic compound which contains a transition metal in its structure can be used in this conversion.
Complete step by step answer:
- Look, Benzyl alcohol is a primary alcohol and benzoic acid contains a carboxylic acid functional group. So, if we can oxidise the carbon of benzyl alcohol which contains hydroxyl group, then we will get the product benzoic acid.
- We can use an acidic, neutral or alkaline solution of $KMn{{O}_{4}}$ to oxidise any primary alcohol to carboxylic acid. So, we can use alkaline potassium permanganate solution to convert benzyl alcohol to benzoic acid.
- It is proved that out of these types of solutions, acidic potassium permanganate is the most strong reagent. $KMn{{O}_{4}}$ in neutral medium is weaker than it in acidic medium and in when $KMn{{O}_{4}}$ is in alkaline medium, it is weakest amongst three.
- We can write the reaction as follows:
- Remember that Jones reagent ($Cr{{O}_{3}}+{{H}_{2}}S{{O}_{4}}$) can also convert most primary alcohols to carboxylic acids but in case of Benzyl alcohol, Jones reagent will first convert it into Benzaldehyde but this reaction will involve formation of hydrates of aldehyde while, benzaldehyde is not able to form stable hydrates. So, this is the reason that we will not be able to use Jones reagent for this conversion.
Note:
Do not get confused in between benzyl, benzal and benzo prefixes. When ‘benzyl’ prefix is used, it means that the carbon that is attached to the benzene ring has two hydrogen atoms. While in case of benzal, this carbon carries one hydrogen atom and in case of benzo, there is no hydrogen attached to the carbon that is directly bonded to the benzene ring.
Complete step by step answer:
- Look, Benzyl alcohol is a primary alcohol and benzoic acid contains a carboxylic acid functional group. So, if we can oxidise the carbon of benzyl alcohol which contains hydroxyl group, then we will get the product benzoic acid.
- We can use an acidic, neutral or alkaline solution of $KMn{{O}_{4}}$ to oxidise any primary alcohol to carboxylic acid. So, we can use alkaline potassium permanganate solution to convert benzyl alcohol to benzoic acid.
- It is proved that out of these types of solutions, acidic potassium permanganate is the most strong reagent. $KMn{{O}_{4}}$ in neutral medium is weaker than it in acidic medium and in when $KMn{{O}_{4}}$ is in alkaline medium, it is weakest amongst three.
- We can write the reaction as follows:
- Remember that Jones reagent ($Cr{{O}_{3}}+{{H}_{2}}S{{O}_{4}}$) can also convert most primary alcohols to carboxylic acids but in case of Benzyl alcohol, Jones reagent will first convert it into Benzaldehyde but this reaction will involve formation of hydrates of aldehyde while, benzaldehyde is not able to form stable hydrates. So, this is the reason that we will not be able to use Jones reagent for this conversion.
Note:
Do not get confused in between benzyl, benzal and benzo prefixes. When ‘benzyl’ prefix is used, it means that the carbon that is attached to the benzene ring has two hydrogen atoms. While in case of benzal, this carbon carries one hydrogen atom and in case of benzo, there is no hydrogen attached to the carbon that is directly bonded to the benzene ring.
Recently Updated Pages
How many sigma and pi bonds are present in HCequiv class 11 chemistry CBSE
Mark and label the given geoinformation on the outline class 11 social science CBSE
When people say No pun intended what does that mea class 8 english CBSE
Name the states which share their boundary with Indias class 9 social science CBSE
Give an account of the Northern Plains of India class 9 social science CBSE
Change the following sentences into negative and interrogative class 10 english CBSE
Trending doubts
Which are the Top 10 Largest Countries of the World?
Difference between Prokaryotic cell and Eukaryotic class 11 biology CBSE
Fill the blanks with the suitable prepositions 1 The class 9 english CBSE
Difference Between Plant Cell and Animal Cell
Give 10 examples for herbs , shrubs , climbers , creepers
Differentiate between homogeneous and heterogeneous class 12 chemistry CBSE
The Equation xxx + 2 is Satisfied when x is Equal to Class 10 Maths
How do you graph the function fx 4x class 9 maths CBSE
Write a letter to the principal requesting him to grant class 10 english CBSE