Answer
Verified
399.6k+ views
Hint: We must know two things to address this question.
Structure of terephthalic acid
And, the role of \[{\text{KMn}}{{\text{O}}_{\text{4}}}\]as an oxidizing agent. Then only we find the product of the reaction.
Complete step by step solution:
First we must remember that (i) Structure of terephthalic acid: - Terephthalic acid is a benzenedicarboxylic acid with carboxyl groups at positions 1 and 4.
(ii) Role of \[{\text{KMn}}{{\text{O}}_{\text{4}}}\]as an oxidising agent in the presence of organic compounds: - The reaction of an alkyl benzene with potassium permanganate (\[{\text{KMn}}{{\text{O}}_{\text{4}}}\]) results in oxidation to benzoic acid. Now, we must note that the position directly adjacent to an aromatic group is called the “benzylic” position, and should contain at least one hydrogen attached to the carbon. For example, in the reaction below you can find all the reactants get converted to carboxylic acid derivatives except for the last one due to the absence of hydrogen at the benzylic position.
Another important point, in order to get the product terephthalic acid, we must look for alkyl groups with at 1 and 4 positions on a benzene ring provided it has at least one hydrogen at benzylic carbon. Only option (A) satisfies these criteria. Let’s look at structure of option A given below:
We can analyse the other options for verification:
Option B: n-Butane is not aromatic so we cannot get an aromatic compound upon oxidation.
Therefore, it’s an incorrect option.
Option C: 1, 3-Di-isopropyl benzene has alkyl group at 1 and 3 positions, therefore we cannot get the desired product on oxidation.
Option D: m-Xylene also has methyl groups at 1 and 3 positions; therefore we cannot get the desired product on oxidation.
Therefore, we can conclude that Option A is the correct answer among the following.
Note: 1. \[{\text{KMn}}{{\text{O}}_{\text{4}}}\]Oxidises all alkyl group on the benzene ring that has at least one hydrogen on the benzylic carbon.
2. Structure of terephthalic should not be confused with other derivatives of benzenedicarboxylic acid. Otherwise the student will end up opting for the wrong answer.
Structure of terephthalic acid
And, the role of \[{\text{KMn}}{{\text{O}}_{\text{4}}}\]as an oxidizing agent. Then only we find the product of the reaction.
Complete step by step solution:
First we must remember that (i) Structure of terephthalic acid: - Terephthalic acid is a benzenedicarboxylic acid with carboxyl groups at positions 1 and 4.
(ii) Role of \[{\text{KMn}}{{\text{O}}_{\text{4}}}\]as an oxidising agent in the presence of organic compounds: - The reaction of an alkyl benzene with potassium permanganate (\[{\text{KMn}}{{\text{O}}_{\text{4}}}\]) results in oxidation to benzoic acid. Now, we must note that the position directly adjacent to an aromatic group is called the “benzylic” position, and should contain at least one hydrogen attached to the carbon. For example, in the reaction below you can find all the reactants get converted to carboxylic acid derivatives except for the last one due to the absence of hydrogen at the benzylic position.
Another important point, in order to get the product terephthalic acid, we must look for alkyl groups with at 1 and 4 positions on a benzene ring provided it has at least one hydrogen at benzylic carbon. Only option (A) satisfies these criteria. Let’s look at structure of option A given below:
We can analyse the other options for verification:
Option B: n-Butane is not aromatic so we cannot get an aromatic compound upon oxidation.
Therefore, it’s an incorrect option.
Option C: 1, 3-Di-isopropyl benzene has alkyl group at 1 and 3 positions, therefore we cannot get the desired product on oxidation.
Option D: m-Xylene also has methyl groups at 1 and 3 positions; therefore we cannot get the desired product on oxidation.
Therefore, we can conclude that Option A is the correct answer among the following.
Note: 1. \[{\text{KMn}}{{\text{O}}_{\text{4}}}\]Oxidises all alkyl group on the benzene ring that has at least one hydrogen on the benzylic carbon.
2. Structure of terephthalic should not be confused with other derivatives of benzenedicarboxylic acid. Otherwise the student will end up opting for the wrong answer.
Recently Updated Pages
Basicity of sulphurous acid and sulphuric acid are
Three beakers labelled as A B and C each containing 25 mL of water were taken A small amount of NaOH anhydrous CuSO4 and NaCl were added to the beakers A B and C respectively It was observed that there was an increase in the temperature of the solutions contained in beakers A and B whereas in case of beaker C the temperature of the solution falls Which one of the following statements isarecorrect i In beakers A and B exothermic process has occurred ii In beakers A and B endothermic process has occurred iii In beaker C exothermic process has occurred iv In beaker C endothermic process has occurred
What is the stopping potential when the metal with class 12 physics JEE_Main
The momentum of a photon is 2 times 10 16gm cmsec Its class 12 physics JEE_Main
How do you arrange NH4 + BF3 H2O C2H2 in increasing class 11 chemistry CBSE
Is H mCT and q mCT the same thing If so which is more class 11 chemistry CBSE
Trending doubts
Difference between Prokaryotic cell and Eukaryotic class 11 biology CBSE
Fill the blanks with the suitable prepositions 1 The class 9 english CBSE
Two charges are placed at a certain distance apart class 12 physics CBSE
Difference Between Plant Cell and Animal Cell
What organs are located on the left side of your body class 11 biology CBSE
Change the following sentences into negative and interrogative class 10 english CBSE
The planet nearest to earth is A Mercury B Venus C class 6 social science CBSE
The Equation xxx + 2 is Satisfied when x is Equal to Class 10 Maths
What is BLO What is the full form of BLO class 8 social science CBSE