Answer
Verified
397.2k+ views
Hint: Phenol is formed when a hydrogen atom in a benzene ring is replaced by a hydroxyl group. $ - OH$ group is called the hydroxyl group. Monohydric phenols are those which contain only one hydroxyl group.
Complete answer:In this question we have to find all the monohydric phenols of molecular formula ${C_7}{H_8}O$. We know phenols are aromatic compounds in which hydrogen is replaced by a hydroxyl group. In the benzene ring, there are only six carbons but in this question, seven carbons are given this means one hydrogen is replaced by a hydroxyl group and one hydrogen is replaced by some group containing carbon.
Due to extra carbon present in this formula, there will be an extra group other than the hydroxyl group (as we have to find monohydric phenols) and this extra group must contain carbon in it. And by interpreting the given formula there are three extra hydrogen atoms (one hydrogen from oh group four of benzene ring which is not replaced by any group so on subtracting these five hydrogen atoms from given eight hydrogen atoms we have extra three hydrogen atoms).
Now there is one carbon and three hydrogen atoms and one group to be formed so the only possibility is the methyl group formed by these four atoms. So we have three possible different structures with formula ${C_7}{H_8}O$ that is:
Note:
Like monohydric phenols there exist dihydric phenols and trihydric phenols. In dihydric phenols, two hydrogen atoms are replaced by a hydroxyl group and in trihydric phenol three hydrogen atoms are replaced by a hydroxyl group. These compounds are the major source of phenolic pollution in rivers and streams.
Complete answer:In this question we have to find all the monohydric phenols of molecular formula ${C_7}{H_8}O$. We know phenols are aromatic compounds in which hydrogen is replaced by a hydroxyl group. In the benzene ring, there are only six carbons but in this question, seven carbons are given this means one hydrogen is replaced by a hydroxyl group and one hydrogen is replaced by some group containing carbon.
Due to extra carbon present in this formula, there will be an extra group other than the hydroxyl group (as we have to find monohydric phenols) and this extra group must contain carbon in it. And by interpreting the given formula there are three extra hydrogen atoms (one hydrogen from oh group four of benzene ring which is not replaced by any group so on subtracting these five hydrogen atoms from given eight hydrogen atoms we have extra three hydrogen atoms).
Now there is one carbon and three hydrogen atoms and one group to be formed so the only possibility is the methyl group formed by these four atoms. So we have three possible different structures with formula ${C_7}{H_8}O$ that is:
Note:
Like monohydric phenols there exist dihydric phenols and trihydric phenols. In dihydric phenols, two hydrogen atoms are replaced by a hydroxyl group and in trihydric phenol three hydrogen atoms are replaced by a hydroxyl group. These compounds are the major source of phenolic pollution in rivers and streams.
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