Alcohols Phenols and Ethers Test

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Alcohols Phenols and Ethers Test - 8

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Question 1
1 / -0

Alcohols are easily dehydrated in the following order

A
Primary> Secondary >Tertiary

B
Secondary > Primary>Tertiary

C
Tertiary > Secondary > Primary

D
None of these

Solution

The rate of dehydration is related to the ease of formation of Carbocation and the energy of the carbocation intermediate. -.

Dehydration involves the formation of carbocation 1^st and since tertiary carbocation is more stable than secondary and primary therefore 3° is dehydrated first.

The ease of formation of Carbocation is Tertiary>Secondary>Primary.
Question 2
1 / -0

One of the following alcohols do not undergo oxidation reaction

A
Tertiary alcohol

B
Secondary alcohol

C
Primary alcohol

D
None of these
Solution
The outcome of oxidation reactions of alcohols depends on the substituents on the carbinol carbon. In order for each oxidation step to occur, there must be H on the carbinol carbon.
- Primary alcohols can be oxidised to aldehydes or further to carboxylic acids. In aqueous media, the carboxylic acid is usually the major product. PCC or PDC, which are used in dichloromethane, allow the oxidation to be stopped at the intermediate aldehyde.
- Secondary alcohols can be oxidised to ketones but no further:
- Tertiary alcohols cannot be oxidised (no carbinol C-H)
Question 3
1 / -0

Lucas test is associated with

A
Carboxylic acid

B
Aldehydes

C
Phenols

D
Alcohols

Solution

Lucas Test is a test which is used to distinguish between primary, secondary and tertiary alcohols. This test is carried out with the help of Lucas reagent, which is a solution of anhydrous Zinc Chloride and concentrated hydrochloric acid (ZnCl₂ + HCl). It is based on the difference between the reactivity of primary, secondary and tertiary alcohols with hydrogen halides.
Question 4
1 / -0

An organic compound containing oxygen, upon oxidation forms a carboxylic acid as the only organic product with its molecular mass higher by 14 units. The organic compound is ______.

A
a secondary alcohol

B
a primary alcohol

C
a ketone

D
an aldehyde

Solution

When –CH₂OH group is replaced by –COOH group then only molecular wt will increase by 14units.
Question 5
1 / -0

Arrange the following compounds in increasing order of their acid strength: Propan – 1 – ol, 2,4,6 – trinitrophenol, 3 – nitrophenol, 3,5 – dinitrophenol,phenol, 4 – methylphenol.

A
4 – methylphenol, phenol, propan – 1 – ol,3 – nitrophenol, 3,5 – dinitrophenol, 2,4, 6 – trinitrophenol.

B
3, 5 – dinitrophenol,2,4, 6 – trinitrophenol, 3 – nitrophenol ,Propan – 1 – ol, 4 – methylphenol,.

C
3 – nitrophenol, 3,5 – dinitrophenol,2,4, 6 – trinitrophenol, Propan – 1 – ol, 4 – methylphenol

D
Propan – 1 – ol, 4 – methylphenol, phenol, 3 – nitrophenol, 3,5 – dinitrophenol,2,4, 6 – trinitrophenol.

Solution

Phenols are more acidic than alcohols Also in phenols if –M groups like –NO₂ are arranged then acidity increases. And –M operates only at o/p position. At m only –I operates.
Question 6
1 / -0

Alcoholic compounds react

A
only as electrophiles

B
Only as nucleophiles.

C
both as nucleophiles and electrophiles.

D
None of these

Solution

The functional group of the alcohols is the hydroxyl group, –OH. Unlike the alkyl halides, this group has two reactive covalent bonds, the C–O bond and the O–H bond. The electronegativity of oxygen is substantially greater than that of carbon and hydrogen. Consequently, the covalent bonds of this functional group are polarized so that oxygen is electron rich and both carbon and hydrogen are electrophilic.
Question 7
1 / -0

An organic compound X is oxidised by using acidified K₂Cr₂O₇. The product obtained reacts with Phenyl hydrazine but does not answer silver mirror test. The possible structure of X is

A
CH₃CHO

B
(CH₃)₂CHOH

C
CH₃CH₂OH

D
None

Solution

Secondary alcohol on oxidation forms ketone which reacts with hydrazine bus doesnot gives silver mirror test.

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Alcohols Phenols and Ethers Test - 8

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Alcohols Phenols and Ethers Test - 8

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Question 1

Primary> Secondary >Tertiary

Secondary > Primary>Tertiary

Tertiary > Secondary > Primary

None of these

Solution

Question 2

Tertiary alcohol

Secondary alcohol

Primary alcohol

None of these

Solution

Question 3

Carboxylic acid

Aldehydes

Phenols

Alcohols

Solution

Question 4

a secondary alcohol

a primary alcohol

a ketone

an aldehyde

Solution

Question 5

4 – methylphenol, phenol, propan – 1 – ol,3 – nitrophenol, 3,5 – dinitrophenol, 2,4, 6 – trinitrophenol.

3, 5 – dinitrophenol,2,4, 6 – trinitrophenol, 3 – nitrophenol ,Propan – 1 – ol, 4 – methylphenol,.

3 – nitrophenol, 3,5 – dinitrophenol,2,4, 6 – trinitrophenol, Propan – 1 – ol, 4 – methylphenol

Propan – 1 – ol, 4 – methylphenol, phenol, 3 – nitrophenol, 3,5 – dinitrophenol,2,4, 6 – trinitrophenol.

Solution

Question 6

only as electrophiles

Only as nucleophiles.

both as nucleophiles and electrophiles.

None of these

Solution

Question 7

CH3CHO

(CH3)2CHOH

CH3CH2OH

None

Solution

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CH₃CHO

(CH₃)₂CHOH

CH₃CH₂OH