214 - Chemistry Questions Answers

starting from benzene

1. 1,2,4 tribromo benzene

2. ortho crisol

3. ortho hydroxy toluene

4. ortho carboxyl toluene

5. m-bromo phenol

Asked By: LOKHESH
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Joshi sir comment

1)  First prepare aniline from benzene via nitro track, it is ortho para director so by bromination 2,4 dibromo aniline will be formed then change NH2 to Br via diazonium track.

2)  First prepare toluene from benzene, then place NHin ortho position and change it into OH via diazonium track.

3)  same as 2.

4)  First prepare toluene from benzene, then place Br in ortho position and change it into COOH via grignard track.

5)  First prepare nitro benzene, it is meta director so form m- bromo nitro benzene, then change nitro to amino and amino to OH via diazonium track. 

which  has smaallest bond length 1.[V(CO)6]- 2.[Mn(CO)6]+ 3.[Cr(CO)6] 3. Fe(CO)5

Asked By: SAHILKUMAR
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Joshi sir comment

2.[Mn(CO)6]+

[V(CO)6]- will be longest

[fe{phen}3]+2 is it dia magnetic

 

Asked By: SAHILKUMAR
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Joshi sir comment

since phen is a strong-field, chelating nitrogen heterocycle so it will force Fe (ii) into a low-spin  t2g6  eg0 electronic configuration with no unpaired electrons so it is diamagnetic

The nitrogen oxide(s) that contain(s) N-N bond(s) is (are) -
(A) N2O (B) N2O3
(C) N2O4 (D) N2O5

Asked By: KAMAL
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Joshi sir comment

(A) N2O      (B) N2O3       (C) N2O4   
These 3 contains N-N bond but in    (D) N2O5    There is 1 oxygen atom between 2 NO2 so this does not contain N-N bond

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