Alcohols Phenols And Ethers

Methyl phenyl ether is obtained by the reaction of phenolate ions and methyl iodide.

Phenol on heating with alcoholic and chloroform to give salicylaldehyde. This reaction is known as Reimer-Tiemann reaction.

Acid strength of oxoacids of different halogens having same oxidation state decreases with the increase in atomic number i.e., . As the electronegativity of the halogen decreases from to , the shared pair of electrons o f the oxygen - halogen bond moves closer and closer torwards the oxygen atom. As a result, bond breaks most readily in and least readily in

Step 1: Understand the preparation of alcohols.
Alcohols can be prepared from haloalkanes via nucleophilic substitution reactions.
Aqueous NaOH provides the hydroxide ion ( ) that substitutes the halide ion, resulting in the formation of alcohols.
Step 2: Identify the correct method.
Heating haloalkanes with aqueous NaOH is the typical method to prepare alcohols, where the halide ion is replaced by the hydroxyl group.

Step 1: Understand the reactions that form aldehydes.
Aldehydes are formed by the oxidation of primary alcohols, ozonolysis of alkenes, and hydration of alkynes.
Dehydrogenation of secondary alcohols, however, forms ketones, not aldehydes.
Step 2: Identify the correct answer.
Dehydrogenation of secondary alcohols forms ketones, not aldehydes.

Step 1: Understand iodoform reaction.
Iodoform is formed by the reaction of compounds containing a methyl group adjacent to a carbonyl group (like in methyl ketones or secondary alcohols).

Step 2: Identify the compound that doesn't form iodoform.
Isobutyl alcohol does not contain a structure that can undergo the iodoform reaction.
It lacks the necessary group (CH -CO) needed for the reaction.