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प्रश्न
Explain Markow nikoff’s rule with suitable example.
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उत्तर
“When an unsymmetrical alkene reacts with hydrogen halide, the hydrogen adds to the carbon that has more number of hydrogen and halogen add to the carbon having fewer hydrogen”. This rule can also be stated as in the addition reaction of alkene/alkyne, the most electro negative part of the reagent adds on to the least hydrogen attached doubly bonded carbon.
Addition of water: (Hydration of alkenes)
Normally, water does not react with alkenes. In the presence of concentrated sulphuric acid, alkenes react with water to form alcohols. This reaction follows carbocation mechanism and Markovnikoff’s rule.
\[\begin{array}{cc}\phantom{...........................}\ce{OH}\\
\phantom{.........................}|\\
\ce{CH3 - C = CH2 ->[H+/H2O] CH3 - C - CH3}\\|\phantom{........................}|\\
\phantom{...}\ce{\underset{\text{2-methylpropene}}{CH3}}\phantom{.............}\ce{\underset{\text{2-methyl-2-proponal}}{CH3}}
\end{array}\]
APPEARS IN
संबंधित प्रश्न
Give IUPAC name for the following compound.
\[\ce{CH3 –CH=CH–CH=CH–C≡C–CH3}\]
\[\begin{array}{cc}
\phantom{......................................................}\ce{CH3}\phantom{............}\ce{Br}\phantom{}\\
\phantom{....................................................}|\phantom{.............}/\phantom{}\\
\ce{A + Mg ->[Dry][ether] CH3-Mg-Br + B ->[i. Dry ether][ii. H-OH/H^+] CH3-C-OH + Mg}\\
\phantom{.....................................................}|\phantom{.............}\backslash\phantom{}\\
\phantom{......................................................}\ce{CH3}\phantom{..........}\ce{OH}\phantom{}
\end{array}\]
Thus, 'B' in the above reaction is:
Markownikoff's rule governs the addition of ____________.
\[\ce{CH3CH2CH = CH2 ->[B2H6][H2O, H2O2, OH^-] X}\]
What is X?
What is the major product formed by HI on reaction with \[\begin{array}{cc}
\ce{CH3}\phantom{....}\\
|\phantom{.......}\\
\ce{CH3-C-CH = CH2}\\
|\phantom{.......}\\
\ce{H3C}\phantom{.........}
\end{array}\]?
Of the five isomeric hexanes, the isomer which can give two monochlorinated compounds is ______.
Which of following properties is not exhibited by benzene?
What is the action of following on but-2-ene?
dil alkaline \[\ce{KMnO4}\]
What is the action of following on but-2-ene?
dil. alkaline KMnO4
What is the action of following on but-2-ene ?
dil. alkaline \[\ce{KMnO4}\]
