Alcohols Phenols and Ethers - Online Test

Answer : Option D
Explaination / Solution:

Ether react with HI to form alcohol and alkyl iodide. Alcohol on oxidation will give iodoform test.

Answer : Option D
Explaination / Solution:

Nitration of phenols: Phenols upon treatment with dilute nitric acid undergoes nitration at low temperature (298 K) to give a mixture of ortho and para nitrophenols. The mixture formed is further separated into ortho and para nitrophenols by steam distillation on the basis of their volatility. Due to intramolecular and intermolecular hydrogen bonding, ortho nitrophenols are lesser volatile in comparison to para nitrophenols which involves only intermolecular hydrogen bonding.

Answer : Option B
Explaination / Solution:

As the length of carbon chain increases, the surface area of the compound will also increase. Van der Waals dispersion force is proportional to the surface area. So the increase of surface are increases the ability of individual molecules to attract each other. Branching in molecules decreases the surface area thereby decreasing the attractive force between individual molecules. As a result, the boiling point decreases.

Answer : Option B
Explaination / Solution:

Oxidation of aromatic alkanes with KMnO4 to give carboxylic acids. Description: Treatment of an alkylbenzene with potassium permanganate results in oxidation to give the benzoic acid.

Answer : Option C
Explaination / Solution:

Esterification is the reaction in which a Carboxylic acid combines with an alcohol in the presence of little concentrated sulphuric acid to form an ester. The esters so formed are pleasant smelling.

Answer : Option A
Explaination / Solution:

The addition of water to an alkene in the presence of a catalytic amount of strong acid leads to the formation of alcohols (hydroxy‐alkanes).

This reaction proceeds via a standard carbocation mechanism and follows the Markovnikov rule.

The mechanism for the addition of water to ethene follows.

1. The hydrogen ion is attracted to the π bond, which breaks to form a σ bond with one of the double‐ bonded carbons. The second carbon of the original double‐bonded carbons becomes a carbocation.

2.An acid‐base reaction occurs between the water molecule and the carbocation, forming an oxonium ion.

3. The oxonium ion stabilizes by losing a hydrogen ion, with the resulting formation of an alcohol.

Answer : Option D
Explaination / Solution:

Carboxylic acids, esters, and acid halides can be reduced to either aldehydes or a step further to primary alcohols, depending on the strength of the reducing agent; aldehydes and ketones can be reduced respectively to primary and secondary alcohols.

Answer : Option B
Explaination / Solution:

The mixture of HCl and ZnCl₂ is called the Lucas Reagent. Secondary and tertiary alcohols react via the S_N¹ mechanism with the Lucas reagent. The ZnCl₂ coordinates to the hydroxyl oxygen, and this generates a far superior leaving group.

When alcohols react with a hydrogen halide, a substitution occurs, producing an alkyl halide and water:

Scope of Reaction: The order of reactivity of alcohols is 3° > 2° > 1°

Answer : Option D
Explaination / Solution:

Alkyl halides are converted into alcohols by substitution reaction. When alkyl halides are treated with aqueous KOH, alcohols are formed. This is a nucleophilic substitution reaction.

Answer : Option B
Explaination / Solution:

Compound (A) i.e., phenol and compound (D) i.e. a derivative of phenol cannot be considered as aromatic alcohol. As phenol is also known as, carbolic acid cannot be considered as aromatic alcohol. Benzyl alcohol and substituted benzyl alcohol are aromatic alcohol.