Advertisements
Advertisements
प्रश्न
An alkene ‘A’ on ozonolysis gives a mixture of ethanal and pentan-3-one. Write structure and IUPAC name of ‘A’.
Advertisements
उत्तर
\[\begin{array}{cc}
\phantom{....................................................}\ce{^5CH3}\\
\phantom{..................................................}|\\
\phantom{...................................................}\ce{^4CH2}\\
\phantom{..................................................}|\\
\ce{A + O3 ->[Zn + H2O] H3C - C = O + ^1CH3 - ^2CH2 - ^3C}\\
\phantom{.......................}|\phantom{...........................}||\\
\phantom{.........................}\ce{\underset{Ethanal}{H}}\phantom{....................}\ce{\underset{Pentan - 3 - one}{O}}
\end{array}\]
During ozonolysis, an ozonide having a cyclic structure is formed as an intermediate which undergoes cleavage to give the final products. Ethanal and pentan-3-one are obtained from the intermediate ozonide. Hence, the expected structure of the ozonide is:
This ozonide is formed as an addition of ozone to ‘A’. The desired structure of ‘A’ can be obtained by the removal of ozone from the ozonide. Hence, the structural formula of ‘A’ is:
\[\begin{array}{cc}
\ce{H3^1C - ^2CH = ^3C - ^4CH2 - ^5CH3}\\
\phantom{.}|\\\phantom{..........}\ce{CH2 - CH3}\end{array}\]
The IUPAC name of ‘A’ is 3-Ethylpent-2-ene.
संबंधित प्रश्न
Write IUPAC name of the product obtained by the ozonolysis of the following compound.
Pent-2-ene
Propanal and pentan-3-one are the ozonolysis products of an alkene? What is the structural formula of the alkene?
Write a chemical equation for combustion reaction of the following hydrocarbon:
Butane
Write a chemical equation for combustion reaction of the following hydrocarbon:
Pentene
Write a chemical equation for combustion reaction of the following hydrocarbon:
Toluene
Arrange the halogens F2, Cl2, Br2, I2, in order of their increasing reactivity with alkanes.
The addition of HBr to 1-butene gives a mixture of products A, B and C
| (A) |  |
| (B) |  |
| (C) | CH3 – CH2 – CH2 – CH2 – Br |
The mixture consists of:
Arrange the following hydrogen halides in order of their decreasing reactivity with propene.
Which of the following alkenes on ozonolysis give a mixture of ketones only?
| (i) | CH3 – CH = CH – CH3 |
| (ii) | \[\begin{array}{cc} \ce{CH3 - C - CH = CH2}\\ |\phantom{.......}\\ \ce{CH3}\phantom{....} \end{array}\] |
| (iii) |  |
| (iv) | \[\begin{array}{cc} \phantom{...................}\ce{CH3}\\ \phantom{..............}/\\ \ce{(CH3)2 C = C}\\ \phantom{..............}\backslash\\ \phantom{...................}\ce{CH3} \end{array}\] |
Which of the following reagent is used for the following reaction?
\[\ce{CH3CH2CH3 ->[?] CH3CH2CHO}\]
The major product formed in the following reactions is:
What would be the main product when propene reacts with HBr?
3-Methyl-pent-2-ene on reaction with HBr in presence of peroxide forms an addition product. The number of possible stereoisomers for the product is ______.
An alkene ‘A’ contains three C-C, eight C-H σ bonds and one C-C π bond. ‘A’ on ozonolysis gives two moles of an aldehyde of molar mass 44 u. Write the IUPAC name of ‘A’.
