Esters and esterifications

Select the correct role of H₂SO₄ in this reaction.

• Transfer of the ester groups.

• Promotes Friedel-Crafts alkylation reaction.

• Catalyses the reaction.

• Reduces acyl group.

When liquid R is refluxed with propanoic acid and a few drops of concentrated sulphuric acid, a sweet smelling liquid is formed. Liquid R may be

• propanol

• ethanoic acid

• hexane

• ethyl propanoate

What is this molecule?

• Ester

• Aldehyde

• Carboxylic acid

• Acid anhydride

• Acyl chloride

What conditions are used for an esterification synthesis?

• dilute H₂SO₄

• conc H₂SO₄

• Heat under reflux

What two organic reagents are needed to make this compound?

• benzoic acid and ethanol

• ethanoic acid and benzene

• methanol and phenolic acid

• ethanol and phenolic acid

Which is the correct structural formula for ethanal?

• CH₃COOH

• CH₃COH

• CH₃CHO

• CH₃COCH₃

Answer explanation

COH is a tertiary alcohol group

Select carbonyl compounds from the following formulae:

• C₄H₁₀O
• C₄H₈O
• C₄H₈O₂
• C₄H₈

When reacted with a strong reducing agent, aldehydes turn into

• carboxylic acids

• ketones

• primary alcohols

• secondary alcohols

Aldehyde reacts with Tollen's reagent forming:

• Yellow precipitate
• Brick-red precipitate
• Purple solution
• Silver mirror

butanoic acid with butan-1-ol--> ?

• Butyl butanoate

• Butyl butanoate and water

• Propyl butanoate

• Propyl butaonate and water