Alcohols Phenols and Ethers Test

Result

Alcohols Phenols and Ethers Test - 22

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Weekly Quiz Competition

Question 1
1 / -0

The correct decreasing order of $$pK_{a}$$ in the given compound is:

A
$$II > IV > I > III$$

B
$$IV > II > III > I$$

C
$$III > II > IV > I$$

D
$$IV > I > II > III$$

Solution

Weaker acids have higher $$pK_{a^{-}} - OCH_{3}$$ at meta-position exerts only $$-I$$ effect, hence increases the acidity.

$$-I$$ effect order: $$-NO_{2} > -OCH_{3} > -Cl$$
$$-CH_{3}$$ has $$+I$$ effect.

$$pKa$$ is inversely proportional to acidity.

So, option A is correct.
Question 2
1 / -0

Degree of unsaturation of $$A=2$$ and it contains no double or triple bonds. Identify the structure of A.

A

B

C

D
None of these

Solution

The degree of unsaturation of $${C}_{10}{H}_{18}O=2$$ but it contains no double or triple bond. Hence, there are two rings-one six-membered as indicated by product and the other three-membered which is cleaved by $$HCl$$ due to strain. Hence $$A$$ has given structure.
Question 3
1 / -0

$$\left[ X \right] $$ is

A

B

C

D

Solution

Two molecules of phenol and one molecule of acetone condense to from product X. The reaction is acid catalyzed. A molecule of water is eliminated.
Question 4
1 / -0

The compound which gets dissolved in water is :

A
$$C_{2}H_{6}$$

B
$$C_{2}H_{4}$$

C
$$C_{2}H_{2}$$

D
$$C_{2}H_{5}OH$$

E
$$C_{3}H_{8}$$

Solution

Option D or Ethanol dissolves in water.

Ethanol has electronegative oxygen atom in it, and hence it takes part in hydrogen bonding with water.

Because of excessive hydrogen bonding with water, Ethanol dissolves in it.
Question 5
1 / -0

Methyl amine with nitrous acid gives

A
methyl alcohol

B
methyl nitrite

C
dimethyl ether

D
methyl nitrite and dimethyl ether

Solution

Methyl amine reacts with nitrous acid to give methyl alcohol
Question 6
1 / -0

An ester can be prepared by the reaction of:

A
two alcohols

B
an alcohol and an aldehyde

C
an alcohol and an organic acid

D
an organic acid and an aldehyde

E
an acid and a ketone

Solution

Esters (RCOOR') are prepared by the reaction between alcohol (R'OH) and organic acid (RCOOH).
Question 7
1 / -0

On reacting with grignard reagent acetone gives?

A
$$1^0 alcohol$$

B
$$2^0 alcohol$$

C
$$3^0 alcohol$$

D
None of these

Solution
Question 8
1 / -0

Williamson synthesis is used to prepare:

A
Acetone

B
Diethyl ether

C
P.V.C.

D
Bakelite

Solution

By heating alkyl halide with sod. or pot. alkoxides (Williamson synthesis) diethyl ether is formed. This is the most important industrial and laboratory method and may be used for preparing simple as well as mixed ethers.

For example :
$$C_2H_5ONa+C_2H_5I\rightarrow C_2H_5O.C_2H_5+NaI$$
Question 9
1 / -0

A and B are -

A

B

C

D

Solution
Question 10
1 / -0

Ethyl ether when reacted with chlorine in dark yields

A
$${CH}_{3}CHClO{CH}_{2}{CH}_{3}$$

B
$${CH}_{3}{CH}_{2}O{CH}_{2}{CH}_{2}Cl$$

C
$$Cl{CH}_{2}{CH}_{2}O{CH}_{2}{CH}_{2}Cl$$

D
$${CH}_{3}CHClOCHCl{CH}_{3}$$

Solution

Ethyl ether, when reacted with $${Cl}_{2}$$ in dark, substitution, occurs at $$\alpha$$-carbon atoms.