Some Chemical Reactions MCQs with Answers

One-liner

A conjugate acid–base pair differs by one proton (H⁺).

One-liner

An exothermic reaction is one in which heat is evolved (released to the surroundings).

One-liner

Ethanol gives a positive iodoform test because it contains the CH₃–CH(OH)– group, which gets oxidized to a methyl ketone (CH₃–CO–) that reacts with iodine in alkali to form yellow precipitate of iodoform (CHI₃).

One-liner

Combustion of hydrocarbons produces carbon dioxide and water as the primary products.

One-liner

Oxidation of a primary alcohol first produces an aldehyde, which upon further oxidation yields a carboxylic acid.

One-liner

Ethylene glycol is oxidized into carboxylic acid by both nitric acid and alkaline KMnO₄.

One-liner

CH3CH2OH (Ethanol) will form a hydrocarbon on reaction with Grignard reagent because alcohols contain an active hydrogen that reacts with Grignard reagents to produce alkanes.

One-liner

A reaction in which heat is evolved (released) is called an exothermic reaction.

One-liner

Salt is mixed to melt the ice on icy roads during winter in cold countries.

One-liner

The volume of 0.25M NaOH needed to neutralize 10 mL of 0.50M HCl is 20 mL.