Alcohols Phenols and Ethers Test

Result

Alcohols Phenols and Ethers Test - 79

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Weekly Quiz Competition

Question 1
1 / -0

Heating together of sodium ethoxide and ethyl iodide will give :

A
ethyl alochol

B
acetadehyde

C
diethyl ether

D
acetic acid

Solution
Question 2
1 / -0

Dehydration of alcohol involves:

A
free radical

B
carbocation

C
carbanion

D
carbene

Solution

A mechanism for dehydration of alcohol is illustrated as above.
From above mechanism, we can see that it involves carbocation in its mechanism.
Hence, Option "B" is the correct answer.
Question 3
1 / -0

Which of the following pairs of reagents will not form ether?

A
$$C_2H_5Br + CH_3COONa$$

B
$$C_2H_5Br + C_2H_5ONa$$

C
$$C_2H_5 Br + (CH_3 )_2 CHONa$$

D
$$(CH_3)_2CHBr + CH_3ONa $$

Solution

The reaction $$\mathrm{C_2H_5Br + CH_3COONa}$$ results in the formation of $$\mathrm{CH_3COOCH_2CH_3}$$

Reaction of $$\mathrm{RBr + R'ONa}$$ results in the formation of Ether $$\mathrm{(ROR')}$$

Hence, Option "A" is the correct answer
Question 4
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Main product(s) of the reaction is/are:

A
$$ CH_3COOH+ H_2 $$

B
$$ CH_3CH_2COOH $$

C
$$ CH_3CH(OH)CH_3 $$

D
$$ CH_3CH_2OH $$

Solution
Question 5
1 / -0

Dehydration of methyl alcohol gives:

A
Methane

B
Ethane

C
Methyl hydrogen sulphate

D
Dimethyl ether

Solution

Dehydration of methyl alcohol gives Dimethyl ether in the presence of concentration $$ H_2SO_4 $$ and at $$413$$k temperature. The reaction follows the nucleophilic bimolecular reaction($$ SN_2 $$) mechanism. Mechanism of reaction is given below:
Step-1: $$ CH_3-OH + H^+ \rightarrow CH_3-O^+H_2 $$
Step-2: $$ CH_3-OH + CH_3-O^+H_2 \rightarrow CH_3-O^+H-CH_3 + H_2O$$
Step-3: $$ CH_3-O^+H-CH_3 \rightarrow CH_3-O-CH_3 + H^+ $$
Question 6
1 / -0

The organic products formed in the reaction, $$C_{6}H_{5}COOCH_{3}\xrightarrow {LiAlH_{4}, H^{+}}$$ are

A
$$C_{6}H_{5}CH_{2}OH$$ and $$CH_{3}OH$$

B
$$C_{6}H_{5}COOH$$ and $$CH_{4}$$

C
$$C_{6}H_{5}CH_{3}$$ and $$CH_{3}OH$$

D
$$C_{6}H_{5}CH_{3}$$ and $$CH_{4}$$

Solution
Question 7
1 / -0

Which of the following can work as dehydrating agent for alcohols?

A
$$H_2SO_4$$

B
$$Al_2O_3$$

C
$$H_3PO_4$$

D
All of these

Solution

Secondary and tertiary alcohols are best dehydrated by dilute sulfuric acid. By heating an alcohol with concentrated sulfuric acid. Other dehydrating agents like phosphoric acid and anhydrous zinc chloride, aluminium oxide may also be used.
Hence, the answer is option $$D$$.
Question 8
1 / -0

An ether is more volatile than an alcohol having the same molecular formula, This is due to:

A
dipolar character of ethers

B
alcohols having resonance structures

C
intermolecular hydrogen bonding in ethers

D
intermolecular hydrogen bonding in alcohols

Solution

An ether is more volatile than an alcohol having same molecular formula because intermolecular hydrogen bonding in alcohols.

The $$-OH$$ group of alcohol can form intermolecular hydrogen bonds whereas $$-O$$ group of ethers cannot form hydrogen bonds.

Hydrogen bond formation is possible when $$H$$ atom is attached to electronegative $$N$$, $$O$$ or $$F$$ atom. Intermolecular hydrogen bonds leads to molecular association.

Hence correct answer is option D.
Question 9
1 / -0

Which of the following will be most easily dehydrated in acidic conditions?

A

B

C

D

Solution
Question 10
1 / -0

When reaction undergoes dehydration reaction in presence of concentrated $$H_2SO_4$$ then what will be the major product?

A

B

C

D

Solution