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CBSE Class 12-science Answered

If meta position shows no mesomerism effect then how come -R group is meta ditective?
 
Asked by peedyojb | 24 Oct, 2017, 04:54: PM
answered-by-expert Expert Answer
The direction of substitution is depend on -R group which is present on benzene ring, thus there are two types of substituents 1) ortho & para directing 2) meta directing.
for example the electrophlic substitution of nitro group to the nitro benzene 
 
in above structeres the positive charge is at the ortho and para positions. therefore they are unreactive to the attacking electrophile which is also positively charged (NO2+), naturally now meta position becomes electron rich than ortho and para positions therefore in this way without showing resonance effect at meta position meta substitution takes place
Answered by Ramandeep | 25 Oct, 2017, 11:11: AM

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CBSE 12-science - Chemistry
sir/madam,  in NCERT chemistry books in organic chemistry sometimes hydrolysis rxn takes places by acid and water(H2SO4 + H2O/ H3O+/H+ + H2)), base with water(NaOH + H2O/ KOH + H2O) and other times only with water(H2O) what is the difference between the three and when do we use them in rxns ? hydrolysis means breaking or cleavage of compounds using water.... am I right? request u to answer all questions pls
Asked by kaziryan.05 | 29 Jun, 2021, 08:36: AM
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CBSE 12-science - Chemistry
name the product formed when chloromethane react with aqus AgCn
Asked by mahaynoorf | 17 Oct, 2020, 08:39: PM
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CBSE 12-science - Chemistry
pls solve sir
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CBSE 12-science - Chemistry
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Asked by mufeedatvp2000 | 14 Apr, 2020, 11:54: AM
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CBSE 12-science - Chemistry
Why the given tautomer is not right ?
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Asked by govtsecschoolnayaganv051 | 28 Aug, 2019, 07:45: PM
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CBSE 12-science - Chemistry
Most reactive nucleophile from the following is? 
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Asked by dineshchem108 | 20 May, 2019, 11:46: PM
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CBSE 12-science - Chemistry
Sir Pl solve questions no 10
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Asked by shobhit | 21 Feb, 2019, 11:01: PM
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CBSE 12-science - Chemistry
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Asked by Atulcaald | 16 May, 2018, 02:43: PM
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CBSE 12-science - Chemistry
  Image not present Z is :- (1) Image not present (2) Image not present (3) Image not present (4) Image not present
Asked by Atulcaald | 16 May, 2018, 02:41: PM
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CBSE 12-science - Chemistry
Give the structure and the IUPAC names of all the carbonyl compounds having formula C4H8O.
Asked by Topperlearning User | 08 Apr, 2014, 08:33: AM
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