Answer
Verified
427.2k+ views
Hint: This method is called Williamson’s synthesis. General reaction of this synthesis is:
Complete step by step answer:
When alkyl halide is heated with alc. Sodium or potassium alkoxide gives corresponding ethers. Simple ethers can be easily prepared by this method.
But for preparation of mixed ether a proper choice of reactant is necessary. Primary alkyl halide is more susceptible to $S{N^2}$ reaction. Therefore, best yield of ether obtained when alkyl halide is primary and alkoxide is tertiary.
Example: tert-butyl ether is prepared by heating ethyl bromide with sodium tert-butoxide.
But when alkyl halide is secondary or tertiary the nucleophilic attack of alkoxide ion on $\alpha - $ carbon atom becomes difficult due to crowding effect.
Since alkoxide is a stronger base and attacking $\beta - $ hydrogen is easier. Therefore $\beta - $ elimination dominates.
Therefore, in the given reaction isobutylene is formed.
So, the correct answer is “Option B”.
Note:
Williamson’s synthesis is a good method for preparation of mixed ether. But proper choice of reagent should be necessary. If we want to prepare t-butyl methyl ether then methyl bromide and sodium t-butoxide should be taken.
Complete step by step answer:
When alkyl halide is heated with alc. Sodium or potassium alkoxide gives corresponding ethers. Simple ethers can be easily prepared by this method.
But for preparation of mixed ether a proper choice of reactant is necessary. Primary alkyl halide is more susceptible to $S{N^2}$ reaction. Therefore, best yield of ether obtained when alkyl halide is primary and alkoxide is tertiary.
Example: tert-butyl ether is prepared by heating ethyl bromide with sodium tert-butoxide.
But when alkyl halide is secondary or tertiary the nucleophilic attack of alkoxide ion on $\alpha - $ carbon atom becomes difficult due to crowding effect.
Since alkoxide is a stronger base and attacking $\beta - $ hydrogen is easier. Therefore $\beta - $ elimination dominates.
Therefore, in the given reaction isobutylene is formed.
So, the correct answer is “Option B”.
Note:
Williamson’s synthesis is a good method for preparation of mixed ether. But proper choice of reagent should be necessary. If we want to prepare t-butyl methyl ether then methyl bromide and sodium t-butoxide should be taken.
Recently Updated Pages
How many sigma and pi bonds are present in HCequiv class 11 chemistry CBSE
Mark and label the given geoinformation on the outline class 11 social science CBSE
When people say No pun intended what does that mea class 8 english CBSE
Name the states which share their boundary with Indias class 9 social science CBSE
Give an account of the Northern Plains of India class 9 social science CBSE
Change the following sentences into negative and interrogative class 10 english CBSE
Trending doubts
During the region of which ruler Moroccan Traveller class 12 social science CBSE
Fill the blanks with the suitable prepositions 1 The class 9 english CBSE
Differentiate between homogeneous and heterogeneous class 12 chemistry CBSE
Difference Between Plant Cell and Animal Cell
Difference between Prokaryotic cell and Eukaryotic class 11 biology CBSE
Give 10 examples for herbs , shrubs , climbers , creepers
Which are the Top 10 Largest Countries of the World?
Write a letter to the principal requesting him to grant class 10 english CBSE
A milkman adds a very small amount of baking soda to class 10 chemistry CBSE