12 CHEMISTRY Unit-17 ETHERS

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| By KUPPUSWAMY G

KUPPUSWAMY G

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Quizzes Created: 16 | Total Attempts: 24,751

Questions: 10 | Attempts: 1,207 | Updated: Mar 20, 2023

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Prepared by: G. KUPPUSWAMY, P. G. Asst., Pachaiyapp's HSS, Kanchipuram.
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Questions and Answers

1.

P{margin-bottom:0.08in;} The isomerism exhibited by C₂H₅OC₂H₅ and CH₃-O-CH-CH₃is | CH₃ a) Functional b) metamerism c) position d) chain
- A.
  
  Option 1
- B.
  
  Option 2
- C.
  
  Option 3
- D.
  
  Option 4
Correct Answer
B. Option 2

Explanation
The isomerism exhibited by C2H5OC2H5 and CH3-O-CH-CH3 is metamerism. This is because both compounds have the same functional group (ether), but differ in the arrangement of the alkyl groups attached to the oxygen atom. In C2H5OC2H5, there are two ethyl groups attached to the oxygen atom, while in CH3-O-CH-CH3, there is one methyl group and one ethyl group attached to the oxygen atom. This difference in arrangement of alkyl groups gives rise to metamerism.

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2.

P{margin-bottom:0.08in;} Which one of the following is simple ether ? a) CH₃-O-C2H₅ b) C₂H5-O-CH₃ c) C₂H₅-O-C₂H₅ d) C₃H₇-O-C₂H₅
- A.
  
  Option 1
- B.
  
  Option 2
- C.
  
  Option 3
- D.
  
  Option 4
Correct Answer
C. Option 3

Explanation
The correct answer is option 3, C2H5-O-C2H5. This is a simple ether because it consists of two alkyl groups (C2H5) bonded to an oxygen atom. The other options either have a methyl group (CH3) or a propyl group (C3H7) bonded to the oxygen atom, which makes them different compounds.

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3.

Diethyl ether can be decomposed wtih a) HI b) KMnO₄ c) NaOH d) H₂O
- A.
  
  Option 1
- B.
  
  Option 2
- C.
  
  Option 3
- D.
  
  Option 4
Correct Answer
A. Option 1

Explanation
Diethyl ether can be decomposed with HI.

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4.

P { margin-bottom: 0.08in; } Oxygen atom of ether is a) very active b) Replaceable b) oxidising d) Comparatively inert
- A.
  
  Option 1
- B.
  
  Option 2
- C.
  
  Option 3
- D.
  
  Option 4
Correct Answer
D. Option 4

Explanation
The correct answer for this question is option 4, "comparatively inert". This means that the oxygen atom in ether is not very reactive or active compared to other options. It is less likely to undergo chemical reactions or be replaced easily.

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5.

P{margin-bottom:0.08in;} According to Lewis concept of acids and bases, ethers are a) Neutral b) Acidic c) Basic d) Amphoteric
- A.
  
  Option 1
- B.
  
  Option 2
- C.
  
  Option 3
- D.
  
  Option 4
Correct Answer
C. Option 3

Explanation
According to Lewis concept of acids and bases, ethers are considered basic.

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6.

P { margin-bottom: 0.08in; } Inter molecular hydrogen bonds are not present in a) CH3COOH b) C₂H₅-O-C₂H₅ c) CH₃CH₂OH d) C₂H₅NH2
- A.
  
  Option 1
- B.
  
  Option 2
- C.
  
  Option 3
- D.
  
  Option 4
Correct Answer
B. Option 2

Explanation
The correct answer is option 2, C2H5-O-C2H5. This compound is an ether, which does not have any hydrogen atoms bonded to electronegative atoms like oxygen or nitrogen. Therefore, intermolecular hydrogen bonds, which occur between hydrogen and electronegative atoms, are not present in this compound.

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7.

P { margin-bottom: 0.08in; } When ethyl Iodide is treated with dry silver oxide it forms a) Ethyl alcohol b) diethylether c) silver ethoxide d) ethylmethyl ether
- A.
  
  Option 1
- B.
  
  Option 2
- C.
  
  Option 3
- D.
  
  Option 4
Correct Answer
B. Option 2

Explanation
When ethyl iodide is treated with dry silver oxide, it forms diethyl ether. This is because the silver oxide acts as a base and abstracts a proton from the ethyl iodide, resulting in the formation of a carbocation. The carbocation then reacts with another molecule of ethyl iodide, leading to the formation of diethyl ether through an SN2 reaction.

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8.

P{margin-bottom:0.08in;} Williamson's synthesis is an example of a) nucleoplilic addition b) electrophilic addition c) eletrophilic substitution d) Nucleophilic substitution reaction
- A.
  
  Option 1
- B.
  
  Option 2
- C.
  
  Option 3
- D.
  
  Option 4
Correct Answer
D. Option 4

Explanation
Williamson's synthesis is an example of nucleophilic substitution reaction.

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9.

P{margin-bottom:0.08in;} When ether is exposed to air for sometime an explosive substance produced is a) peroxide b) oxide c) TNT d) superoxide
- A.
  
  Option 1
- B.
  
  Option 2
- C.
  
  Option 3
- D.
  
  Option 4
Correct Answer
A. Option 1

Explanation
When ether is exposed to air for some time, it can react with oxygen in the air to form explosive peroxides. These peroxides are highly unstable and can easily explode upon contact with heat, friction, or shock. Therefore, it is important to handle and store ether properly to prevent the formation of these dangerous peroxides.

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10.

P { margin-bottom: 0.08in; } Ether is formed when alkylhalide is treated with sodium alkoxide. This method is known as a) hoffmann reaction b) Williamson's synthesis c) Wurtz synthesis d) kolbe's reaction
- A.
  
  Option 1
- B.
  
  Option 2
- C.
  
  Option 3
- D.
  
  Option 4
Correct Answer
B. Option 2

Explanation
The correct answer is b) Williamson's synthesis. This method involves the reaction between an alkyl halide and a sodium alkoxide to form an ether. It is a commonly used method for the synthesis of ethers.

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Current Version
Mar 20, 2023

Quiz Edited by
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Dec 23, 2013

Quiz Created by
KUPPUSWAMY G

12 Chemistry Unit-17 Ethers

P{margin-bottom:0.08in;} The isomerism exhibited by C₂H₅OC₂H₅ and CH₃-O-CH-CH₃is | CH₃ a) Functional b) metamerism c) position d) chain

P{margin-bottom:0.08in;} Which one of the following is simple ether ? a) CH₃-O-C2H₅ b) C₂H5-O-CH₃ c) C₂H₅-O-C₂H₅ d) C₃H₇-O-C₂H₅

Diethyl ether can be decomposed wtih a) HI b) KMnO₄ c) NaOH d) H₂O

P { margin-bottom: 0.08in; } Oxygen atom of ether is a) very active b) Replaceable b) oxidising d) Comparatively inert

P{margin-bottom:0.08in;} According to Lewis concept of acids and bases, ethers are a) Neutral b) Acidic c) Basic d) Amphoteric

P { margin-bottom: 0.08in; } Inter molecular hydrogen bonds are not present in a) CH3COOH b) C₂H₅-O-C₂H₅ c) CH₃CH₂OH d) C₂H₅NH2

P { margin-bottom: 0.08in; } When ethyl Iodide is treated with dry silver oxide it forms a) Ethyl alcohol b) diethylether c) silver ethoxide d) ethylmethyl ether

P{margin-bottom:0.08in;} Williamson's synthesis is an example of a) nucleoplilic addition b) electrophilic addition c) eletrophilic substitution d) Nucleophilic substitution reaction

P{margin-bottom:0.08in;} When ether is exposed to air for sometime an explosive substance produced is a) peroxide b) oxide c) TNT d) superoxide

P { margin-bottom: 0.08in; } Ether is formed when alkylhalide is treated with sodium alkoxide. This method is known as a) hoffmann reaction b) Williamson's synthesis c) Wurtz synthesis d) kolbe's reaction