Alcohols Phenols and Ethers Test

Result

Alcohols Phenols and Ethers Test - 37

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Weekly Quiz Competition

Question 1
1 / -0

Alcohols containing only up to ________________ carbon atoms are completely miscible with water.

A
10

B
3

C
8

D
14

Solution

Alcohol-containing up to $$3-$$ carbon atoms are completely miscible with water in all proportions. This is due to the hydrogen bonding with water molecule.
Question 2
1 / -0

What are X and Y respectively in the following reaction?
$$\displaystyle X \xrightarrow[]{PBr_3} C_2H_5Br \xrightarrow[\Delta]{AgOH}Y$$

A
$$CH_3OH, C_2H_6$$

B
$$C_2H_5OH, C_2H_5AgBr$$

C
$$CH_3COOH, CH_3CH_2OH$$

D
$$C_2H_5OH, C_2H_5OH$$

Solution

Ethanol when treated with $${ PBr }_{ 3 }$$, it gives biomethane which on further treatment with $$AgOH$$ gives back ethanol.
Question 3
1 / -0

Hydrogen chloride and $$SO_2$$ are the side products in the reaction of ethanol with thionyl chloride. Which of the following is the main product in this reaction?

A
$$C_2H_5OC_2H_5$$

B
$$C_2H_6$$

C
$$CH_3Cl$$

D
$$C_2H_5Cl$$

Solution

When ethanol is treated with thionyl-chloride, the side product are $$HCl$$ and $$S{ O }_{ 2 }$$ and main product is $${ C }_{ 2 }{ H }_{ 5 }Cl.$$
Question 4
1 / -0

Which of the following is used in the manufacture of ethanol?

A
$$C_2H_6$$

B
$$C_2H_2$$

C
$$CH_4$$

D
$$C_2H_4$$

Solution

The correct option is D. Ethanol can be prepared by hydration of ethane in the presence of $$H_{ 2 }O.$$
Question 5
1 / -0

What type of spectroscopy would be the best tool to analyze a clear and colorless solution for the presence of a functional group like an alcohol group $$(-OH)$$?

A
UV spectroscopy.

B
IR spectroscopy.

C
Mass spectroscopy.

D
Photoelectron spectroscopy.

Solution

Functional groups are best analyzed by IR spectroscopy.IR is infrared spectroscopy that works in IR region of electromagnetic radiations. stretching frequencies of functional groups are measured due to their vibration around bonds. Every functional groups have their particular stretching frequency range.In this way functional groups are analyzed by IR.
Question 6
1 / -0

Which of the following can not be formed by hydrolysis of alkenes?

A
Methanol

B
Ethanol

C
Propanol

D
None of these

Solution

The correct option is A.
Hydrolysis of alkene mainly gives alcohol simplest alkene that is ethane on hydrolysis gives ethanol. So Methanol cannot be formed by hydrolysis of alkene.
Question 7
1 / -0

Methanol can be prepared when :

A
iodomethane is heated with moist silver oxide

B
iodomethane react with sodium in the presence of ether

C
both A and B

D
none of these

Solution

Moist Silver oxide
$$Ag_2O + H_2O \rightarrow 2AgOH$$
$$CH_3-I + AgOH \rightarrow CH_3-OH + AgI$$
Therefore, methanol can be prepared when iodomethane is heated with moist silver oxide.
Question 8
1 / -0

Dehydration of alcohol is an example of which type of reaction?

A
Substitution

B
Elimination

C
Addition

D
Both $$B$$ and $$C$$

Solution

When heated with strong acids catalysts, alcohols typically undergo a 1,2-elimination reactions to generate an alkene and water. Also known as dehydration since it involves the removal of a molecule of water.
Question 9
1 / -0

The IUPAC name of:

A
2, 1-dimethyl-1, 3-butanol

B
4,4-dimethyl-2-pentanol

C
4-methyl-2, 4-pentanol

D
1, 3, 3-trimethyl-1, 3-propanol

Solution

The IUPAC name of the given compound is 4,4-dimethyl-2-pentanol.
The parent hydrocarbon contains 5 $$C$$ atoms and a $$-OH$$ group. Hence, it is pentanol. Two methyl groups are present as substituents on fourth carbon atom and are named as the prefix. The prefix di indicates 2. The numbering is done from the end which gives the lowest locant to the $$C$$ atom bearing $$-OH$$ group.

Hence, the correct option is $$B$$
Question 10
1 / -0

Melting point of phenol is:

A
$$95^0$$C

B
$$43^0$$C

C
$$20^0$$C

D
$$10^0$$C

Solution

The correct option is $$B$$.
Phenol is crystalline solid and has a definite melting point at $$43$$ degree Celsius.