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Is no2 compound a meta directing group????how to convert nitrobenzene to m-bromonitrobenzene???how to convert benzoic acid to phenol??Is it possible as they are aromatic compounds????

Is no2 compound a meta directing group????how to convert nitrobenzene to m-bromonitrobenzene???how to convert benzoic acid to phenol??Is it possible as they are aromatic compounds????

Grade:12

7 Answers

Jayant Kishore
144 Points
5 years ago
NO2 is a meta-directiong group .
 
Nitrobenzene +Br2 /CCl4→  m-bromonitrobenzene
 
Phenol + Zn dust → Benzene 
 Benzene + CH3Cl /AlCl3 (anhyd.) → Toluene
Toluene + KMnO4 → Benzoic Acid
mansi
25 Points
5 years ago
from benzoic acid to phenol????
is no2 ortho and para directing group??........................................................................................................
Jayant Kishore
144 Points
5 years ago
Sorry, the correct pathway is : 
C6H- COOH + NaOH+CaO (High T& P) → C6H6 (Decarboxylation using sodalime)
C6H+ Cl2 + FeCl3 → C6H- Cl  (Electrophilic Aromatic Substitution)
 C6H- Cl + NaOH + H+ (High T& P) →  C6H- OH ( Nucleophilic Aromatic Substitution)
 
NO2 is definately a meta directing group. If you draw the resonating structures , positive charge comes at ortho and para positions , thus these places do not favour attack of electrophile as electrophiles are electron loving species .Thus electrophile attacks at meta position.
 
mansi
25 Points
5 years ago
can u name some electrophiles?????????????????...........................................................................................
Jayant Kishore
144 Points
5 years ago
Electrophiles are electrom deficient molecules . They may be neutral such as BF ,AlCl3 , FeCl3 ,PCl5 ...etc or they may be positively charged H+,Cl+,Br+,NO2+ …..etc. Positively charged electrophiles are generally used in Electrophilic Aromatic Substitution .For example  Cl2 with AlCl3 forms Cl+ electrophile and AlCl4- ,similarly CH3Cl with AlCl3 forms an electrophile CH3+ . 
mansi
25 Points
5 years ago
explain the basicity of amines in aqueous solutions????????????????????????????????????????????..........................................
Jayant Kishore
144 Points
5 years ago
You could have posted this as a new question on the forum. Nevertheless,
Basic strength in aq medium : (C2H5)2NH > (C2H5)3​N > (C2H5)​NH2 >NH3
                                            (CH3)2 NH >  (CH3) NH2 > (CH3)3N  >NH3  
The above trend is generally observed because of the combined effect of  stability of their conjugate acid (due to H- bonding) and the Inductive effect of the alkyl group(s) . Greater the size of conj. acid less will be the solvation  and hence less stable will be the conj acid . Greater the stability of conj. acid greater is the basic strength. Due to steric hinderance of alkyl groups in H-bonding the stability order changes. You will have to memorize the above two orders as they are very important.( For more clarity NCERT part 2 Pg 390-391 ). By the way you haven’t approved any of my answers.
Regards

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