Ethers - Structure NEET Questions

Organic Chemistry - Organic Compounds Containing Oxygen

Ethers - Structure MCQ Questions


1.
In the IUPAC system of nomenclature, ethers are regarded as hydrocarbon derivatives in which a hydrogen atom is replaced by which group?
A.
–OH (hydroxyl group)
B.
–OR or –OAr (alkoxy or aryloxy group)
C.
–COOH (carboxyl group)
D.
–CHO (aldehyde group)
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ANSWER :
B. –OR or –OAr (alkoxy or aryloxy group)
2.
In ethers, the C–O–C bond angle is:
A.
Exactly equal to the tetrahedral angle (109°28′)
B.
Equal to 90°
C.
Slightly less than the tetrahedral angle
D.
Slightly greater than the tetrahedral angle
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ANSWER :
D. Slightly greater than the tetrahedral angle
3.
The C–O bond length in ethers (e.g., methoxymethane) is approximately:
A.
96 pm
B.
120 pm
C.
141 pm
D.
154 pm
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ANSWER :
C. 141 pm
4.
What is the hybridisation of the oxygen atom in dimethyl ether (CH₃–O–CH₃)?
A.
sp³d
B.
sp
C.
sp²
D.
sp³
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ANSWER :
D. sp³
5.
Which of the following is classified as a symmetrical (simple) ether?
A.
C₂H₅–O–C₆H₅
B.
C₂H₅–O–C₂H₅
C.
CH₃–O–C₂H₅
D.
C₆H₅–O–CH₃
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ANSWER :
B. C₂H₅–O–C₂H₅
6.
Which of the following ethers is unsymmetrical (mixed)?
A.
CH₃–O–CH₃
B.
C₂H₅–O–C₂H₅
C.
C₂H₅–O–CH₃
D.
CH₃–CH₂–CH₂–O–CH₂–CH₂–CH₃
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ANSWER :
C. C₂H₅–O–CH₃