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NCERT Class XI Chemistry Hydrocarbons Solutions

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Question : 5
Total: 25
An alkene A on ozonolysis gives a mixture of ethanal and pentan-3- one. Write the structure and IUPAC name of A.
Solution:  
(A)
Alkene
ozonolysis
→
CH3−CHO
Ethanal
+O=
CH3
|
CH2
|
C
|
CH2
|
CH3
Pentan - 3 - one
An alkene when subjected to ozonolysis, cleaves at the double bond and gives rise to carbonyl compounds.
Since, the given compounds here are ethanal and pentan-3-one, the alkene can be predicted to be:
H3C−HC=O+O=
CH3
|
CH2
|
C
|
CH2
|
CH3
→
H3
C
1
−
‌
2
CH=
‌
3
CH3
|
CH2
|
C
−
‌
4
CH2−
‌
5
CH3
3−Ethylpent−2−ene

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