NCERT Class XI Chemistry Organic Chemistry Some basic principles and Techniques Solutions

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Question : 2
Total: 40
Indicate the s and p bonds in the following molecules :
C6H6,C6H12,CH2Cl2 , CH2=C=CH2 , CH3NO2,HCONHCH3
Solution:  
The σ and π bonds are indicated below :
(i)

(ii) C6H12 can be either :
(a) Straight chain compound
H3CH2CH2CHC=CHCH3

H
σ
σ
H
|
C
σ
|
H
σ
σ
H
|
C
σ
|
H
σ
σ
H
|
C
σ
|
H
σ
C
σ
|
H
σ
=
π
σ
H
|
C
σ
σ
H
|
C
σ
|
H
σ
H

12 C-H σ - bonds
5 C-C σ - bonds
1 C-C π - bond
Other straight chain isomers will also have the same no. of σ and π bonds.
(ii)
6 C-C σ bonds
12 C-H σ bonds
Other cyclic isomers will also have sam no. of σ and π - bonds.
(iii)

2 C-H σ bonds
2 C-Cl σ bonds
(iv)

4 C-H σ bonds
2 C-C σ bonds
2 C-C π bonds
(v)

3 C-H σ bonds
1 C-N σ bond
1 N-O σ bond
1 N-O π bond
(vi)

4C-H σ bonds
1 N-H σ bond
1 C-O π bond
1C-O σ bond
2 C-N σ bonds
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