Advertisements
Advertisements
प्रश्न
Explain Markow nikoff’s rule with suitable example.
Advertisements
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
What is the action of following on but-2-ene?
dil. alkaline KMnO4
What is the action of following on but-2-ene?
acidic KMnO4
Read the following reaction and answer the questions given below.
\[\begin{array}{cc}
\phantom{..............................}\ce{CH3}\\\phantom{...........................}|\\\ce{CH3 - C = CH2 + HBr ->[benzoyl][peroxide] CH3 - CH - CH2Br}\\
|\phantom{....................................}\\
\ce{CH3}\phantom{.................................}\end{array}\]
- Write the IUPAC name of the product.
- State the rule that governs the formation of this product.
An alkyl halide with molecular formula C6H13Br on dehydro halogenation gave two isomeric alkenes X and Y with molecular formula C6H12. On reductive ozonolysis, X and Y gave four compounds CH3COCH3, CH3CHO, CH3CH, CHO and (CH3)2 CHCHO. Find the alkyl halide.
What is the main product of the reaction between 2-Methylpropene with HBr?
Acetone and acetaldehyde are the ozonolysis products of an alkene. Write the structural formula of an alkene and give IUPAC name of it.
Read the following reaction and answer the questions given below.
\[\begin{array}{cc}
\phantom{..............................}\ce{CH3}\\\phantom{...........................}|\\\ce{CH3 - C = CH2 + HBr ->[benzoyl][peroxide] CH3 - CH - CH2Br}\\
|\phantom{....................................}\\
\ce{CH3}\phantom{.................................}\end{array}\]
- Write IUPAC name of the product.
- State the rule that governs formation of this product.
What is the action of following on but-2-ene?
dil. alkaline KMnO4
Write the reaction to convert propene to isopropyl alcohol.
What is the action of following on but-2-ene?
dil. alkaline KMnO4
