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प्रश्न
Explain the fact that in alkyl aryl ethers, the alkoxy group is ring activating and ortho/para directing towards electrophilic aromatic substitution.
उत्तर
- Resonance structures of alkyl aryl ethers are as follows:
- The +R effect of −OR the group results in increased electron density at the para- and two ortho positions.
Hence, the alkoxy group in aromatic ether is a ring activating and ortho/para-directing group towards electrophilic aromatic substitution.
संबंधित प्रश्न
Choose the correct option.
Ethers react with cold and concentrated H2SO4 to form ________.
Write the preparation of ethanol from methyl magnesium iodide.
Write the reaction between ethanol and acetic anhydride.
How will you prepare diethyl ether by dehydration of alcohol?
What are the limitations to prepare ether by this method?
What is the action of following on diethyl ether?
dil. H2SO4
Which of the following compounds does not contain \[\begin{array}{cc}\backslash\phantom{......}\\\ce{C = O}\\
/\phantom{......}\\\end{array}\] group?
Action of hydrogen iodide on anisole gives ______.
In ethers, two C-O sigma bonds are formed by ____________ overlap.
A mixed ether on hydrolysis gives ____________.
\[\ce{(CH3)2CH - O - CH3 ->[Cold HI] X + Y}\]
\[\ce{X ->[K2Cr2O7][dil. H2SO4] Z}\]
\[\ce{Y ->[NaOH(aq)][\Delta] CH3OH}\]
Identify X, Y and Z.
To prepare ethanol from methyl magnesium bromide, the other reagent required is ____________.
When methoxy benzene reacts with HI at room temperature the products formed are ______.
What are the products of the following reaction?
\[\ce{(CH3)3C - O - CH3 + HI ->[cold] ?}\]
Which of the following compounds does NOT contain \[\begin{array}{cc}\backslash\phantom{.......}\\\ce{C = O}\\
/\phantom{.......}\\\end{array}\] group?
Ether is obtained from ethyl alcohol in presence of H2SO4 at _______.
The major product of the reaction between tert-butyl chloride and sodium ethoxide is ______.
Isopropyl methyl ether when treated with cold hydrogen iodide gives ______.
Formation of diethyl ether from ethanol is based oh a ______.
Why ethers possess a small net dipole moment?
Explain Williamson's synthesis.
Write preparation of diethyl ether.
