Organic Chemistry Questions and Answers – Physical Properties of Ethers | Organic Chemistry Multiple Choice Questions and Answers

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Questions
1 Which of the following is distinguish test for ether?
A Lucas test
B FeCl3 test
C Molisch test
D Zeisel test

Answer: Zeisel test
2 Which of the following statement is not true about ethers?
A The lower ethers are highly volatile and flammable
B Lower ethers also act as anaesthetics
C Ethers are not organic solvents
D Simple ethers (such as diethyl ether) are tasteless

Answer: Ethers are not organic solvents
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3 Why ether is more volatile than an alcohol having the same molecular formula?
A dipolar character of ethers
B alcohols having resonance structures
C inter-molecular hydrogen bonding in ethers
D inter-molecular hydrogen bonding in alcohols

Answer: inter-molecular hydrogen bonding in alcohols
4 Why the boiling point of ethyl alcohol is much higher than that of dimethyl ether though both have the same molecular weight?
A Ether is insoluble in water
B Methyl groups are attached to oxygen in ether
C Dipole moment of ethyl alcohol is less
D Ethyl alcohol shows hydrogen bonding

Answer:Ethyl alcohol shows hydrogen bonding
5 Which of the following has lower boiling point than dimethyl ether?
A Pentane
B Propane
C Tetrahydrofuran
D n-butanol

Answer: Propane
6 Which of the following statements about ethers is incorrect?
A Ethers are flammable
B Ethers form peroxides by free radical oxidation
C Ethers are widely used as extraction solvents
D An ether oxygen can only be found within an acyclic carbon chain

Answer:An ether oxygen can only be found within an acyclic carbon chain
7 Which of the following product is formed, when ether is exposed to air?
A Oxide
B Alkanes
C Alkenes
D Peroxide of diethyl ether

Answer: Peroxide of diethyl ether
8 An organic compound A reacts with sodium metal and forms B. On heating with conc. H2SO4, A gives diethyl ether. What are A and B?
A C2H5OH and C2H5ONa
B C3H7OH and CH3ONa
C CH3OH and CH3ONa
D C4H9OH and C4H9ONa

Answer: C4H9OH and C4H9ONa
9 What is the smell of the diethyl ether?
A Vinegar
B Sweet smell
C Rotten egg
D Fish like smell

Answer: Sweet smell
10 Which of the following Is the correct reason for cyclic ether are miscible in water?
A Planer structure
B Larger size
C Molecular weight
D Hydrogen bonding

Answer: Hydrogen bonding
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