Ethers - preparation and properties — NEET & JEE Questions

Question 1 · difficulty L1 · recall

The Williamson ether synthesis prepares ethers by reacting an alkoxide ion with typically a

• A. primary alkyl halide
• B. carboxylic acid only
• C. ketone only
• D. tertiary carbocation in water

Question 2 · difficulty L2 · understanding

Given below are two statements : Statement I : Dimethyl ether is completely soluble in water. However, diethyl ether is soluble in water to a very small extent. Statement II : Sodium metal can be used to dry diethyl ether and not ethyl alcohol. In the light of given statements. choose the correct answer from the options given below

• A. Statement I is false but Statement II are true
• B. Statement I is true but Statement II is false
• C. Both Statement I and Statement II are true
• D. Both Statement I and Statement II are False

Question 3 · difficulty L2 · understanding

Suitable reaction condition for preparation of Methyl phenyl ether is

• A. Benzene, MeBr
• B. $$\mathrm{Ph{O^\Theta }N{a^ \oplus }}$$, MeBr
• C. Ph - Br, $$\mathrm{Me{O^\Theta }N{a^ \oplus }}$$
• D. $$\mathrm{Ph{O^\Theta }N{a^ \oplus }}$$, MeOH

Question 4 · difficulty L2 · understanding

Ethers generally have lower boiling points than isomeric alcohols mainly because ethers

• A. cannot form intermolecular O-H hydrogen bonds with one another
• B. contain no oxygen
• C. are ionic compounds
• D. have much larger molecular masses in every case

Question 5 · difficulty L3 · understanding

0.1 mole of compound ‘S’ will weigh ___________ g. (Given molar mass in g mol −1 C : 12, H : 1, O : 16)

Question 6 · difficulty L3 · understanding

$$\text { Consider the following reaction. }$$ Statement I : In the above reaction, product formed will be a mixture of benzyl alcohol and iodobenzene. Statement II : In the above reaction, the $-\mathrm{O}-\mathrm{CH}_2-$ bond is cleaved to give the product. In the light of the above statements, choose the correct answer from the options given below :

• A. Both Statement I and Statement II are true
• B. Both Statement I and Statement II are false
• C. Statement I is true but Statement II is false
• D. Statement I is false but Statement II is true

Question 7 · difficulty L3 · understanding

Given below are two statements : Statement I : Statement II : In , intramolecular substitution takes place first by involving lone pair of electrons on nitrogen. In the light of the above statements, choose the most appropriate answer from the options given below

• A. Both Statement I and Statement II are correct
• B. Statement I is incorrect but Statement II is correct
• C. Both Statement I and Statement II are incorrect
• D. Statement I is correct but Statement II is incorrect

Question 8 · difficulty L3 · understanding

For the Compounds : (A) $$\mathrm{H}_3 \mathrm{C}-\mathrm{CH}_2-\mathrm{O}-\mathrm{CH}_2-\mathrm{CH}_2-\mathrm{CH}_3$$ (B) $$\mathrm{H}_3 \mathrm{C}-\mathrm{CH}_2-\mathrm{CH}_2-\mathrm{CH}_2-\mathrm{CH}_3$$ (C) (D) The increasing order of boiling point is : Choose the correct answer from the options given below :

• A. $$(\mathrm{D})<(\mathrm{C})<(\mathrm{A})<(\mathrm{B})$$
• B. $$(\mathrm{B})<(\mathrm{A})<(\mathrm{C})<(\mathrm{D})$$
• C. $$(\mathrm{A})<(\mathrm{B})<(\mathrm{C})<(\mathrm{D})$$
• D. $$\mathrm{ (B)<(A)<(D)<(C)}$$

Question 9 · difficulty L3 · understanding

2-Methyl propyl bromide reacts with $$\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{O}^{-}$$ and gives 'A' whereas on reaction with $$\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}$$ it gives 'B'. The mechanism followed in these reactions and the products 'A' and 'B' respectively are :

• A. $$\mathrm{S}_{N} 1, A=$$ tert-butyl ethyl ether; $$\mathrm{S}_{N} 2, B=$$ iso-butyl ethyl ether
• B. $$\mathrm{S}_{\mathrm{N}} 1, \mathrm{~A}=$$ tert-butyl ethyl ether; $$\mathrm{S}_{\mathrm{N}} 1, \mathrm{~B}=$$ 2-butyl ethyl ether
• C. $$\mathrm{S}_{\mathrm{N}} 2, \mathrm{~A}=$$ iso-butyl ethyl ether; $$\mathrm{S}_{\mathrm{N}} 1, \mathrm{~B}=$$ tert-butyl ethyl ether
• D. $$\mathrm{S}_{\mathrm{N}} 2, \mathrm{~A}=$$ 2-butyl ethyl ether; $$\mathrm{S}_{\mathrm{N}} 2, \mathrm{~B}=$$ iso-butyl ethyl ether

Question 10 · difficulty L3 · understanding

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Synthesis of ethyl phenyl ether may be achieved by Williamson synthesis. Reason (R) : Reaction of bromobenzene with sodium ethoxide yields ethyl phenyl ether. In the light of the above statements, choose the most appropriate answer from the options given below :

• A. Both (A) and (R) are correct and (R) is the correct explanation of (A)
• B. (A) is correct but (R) is not correct
• C. (A) is not correct but (R) is correct
• D. Both (A) and (R) are correct but (R) is not the correct explanation of (A).