12 Chemistry – Ether Test 1
1 / 30
Ethers having same alkyl groups on both sides of oxygen atom are called ______.
This is wrong answer.
Yes. You are Correct.
Such ethers are known as simple or symmetrical ethers.
2 / 30
Ethers having two different alkyl or aryl groups are called ______.
These are known as mixed or unsymmetrical ethers.
3 / 30
The common name of CH3OC2H5 is ______.
CH3OC2H5 has methyl and ethyl groups; hence called methyl ethyl ether.
4 / 30
The IUPAC name of CH3OC2H5 is ______.
The larger alkyl group is considered main chain; named as ethoxyethane.
5 / 30
The functional group of ethers is ______.
Ethers contain an oxygen atom connected to two alkyl or aryl groups, i.e., C–O–C.
6 / 30
In ethers, the oxygen atom is ______ hybridized.
In ethers, oxygen is sp3 hybridized, forming a bent structure.
7 / 30
The C–O–C bond angle in dimethyl ether is approximately ______.
Due to repulsion between lone pairs, the bond angle is around 111°.
8 / 30
Williamson synthesis involves the reaction between alkyl halide and ______.
Ethers are prepared by reacting alkyl halide with sodium alkoxide.
9 / 30
Which of the following is a limitation of Williamson synthesis?
Tertiary alkyl halides undergo elimination instead of substitution.
10 / 30
Ethers can be prepared by acid-catalyzed dehydration of alcohols at ______ temperature.
At 413 K, alcohols undergo intermolecular dehydration to give ethers.
11 / 30
At 443 K, alcohols on dehydration give ______.
At higher temperature, dehydration gives alkenes instead of ethers.
12 / 30
Diethyl ether is also known as ______.
Diethyl ether is commonly known as ethoxyethane.
13 / 30
Ethers have low boiling points due to ______.
Ethers cannot form hydrogen bonds among themselves.
14 / 30
Ethers are sparingly soluble in water because ______.
Ethers can form limited hydrogen bonds with water molecules.
15 / 30
Ethers are used as ______.
Ethers are good solvents for organic reactions.
16 / 30
When ethers react with HI, the bond that breaks is ______.
C–O bond breaks in the reaction with hydrogen halides.
17 / 30
Cleavage of ether with HI gives ______ and ______.
The reaction gives alkyl halide and alcohol (or phenol).
18 / 30
The order of reactivity of hydrogen halides with ethers is ______.
HI > HBr > HCl is the reactivity order.
19 / 30
In cleavage of mixed ether R–O–R′ by HI, which alkyl group forms the iodide?
The less hindered alkyl group forms the iodide.
20 / 30
Aromatic ethers like anisole undergo ______ substitution reactions.
Anisole undergoes electrophilic substitution due to electron releasing methoxy group.
21 / 30
In anisole, –OCH3 group activates the benzene ring towards ______.
It activates the ring towards electrophilic substitution.
22 / 30
During halogenation of anisole, substitution occurs mainly at ______ position.
The –OCH3 group directs substitution to ortho and para positions.
23 / 30
Anisole reacts with acetyl chloride in presence of AlCl3 to give ______.
This is a Friedel–Crafts acylation giving p-methoxyacetophenone.
24 / 30
The reaction of anisole with nitric acid gives ______.
Nitration gives ortho- and para-nitroanisole.
25 / 30
Diethyl ether forms explosive peroxides on standing in air due to ______.
Ethers oxidize slowly in air forming peroxides.
26 / 30
The safest way to store diethyl ether is ______.
It should be stored away from light and air in tightly closed bottles.
27 / 30
Industrial preparation of diethyl ether involves dehydration of ethanol using ______ catalyst.
Concentrated H2SO4 acts as the catalyst in dehydration.
28 / 30
In Williamson synthesis, the best combination is ______.
Primary alkyl halide and primary alkoxide give good yield of ether.
29 / 30
Anisole can be prepared by reacting ______ with methyl iodide.
Phenol reacts with methyl iodide to form anisole.
30 / 30
Diethyl ether is used as an anesthetic because ______.
It depresses the central nervous system, inducing unconsciousness.
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