ECAT Chemistry — Aldehydes and Ketones
Aldehydes and Ketones is part of the Chemistry section of the UET ECAT (30 of the 100 MCQs). It breaks into 1 subtopic, and we hold 13 ECAT-pattern practice MCQs on it, each with a written explanation. Tap a subtopic below to practise just that.
Subtopics (1)
How Aldehydes and Ketones is tested
Across the 7 ECAT past papers on ParhaiKrlo, Aldehydes and Ketones accounts for 5 questions. It appears in 4 of them, about 1.3 questions a paper. The heaviest was ECAT Past Paper 06, with 2 questions.
| Paper | Questions |
|---|---|
| ECAT Past Paper 06 | 2 |
| ECAT Past Paper 04 | 1 |
| ECAT Past Paper 03 | 1 |
| ECAT Past Paper 02 | 1 |
Aldehydes and Ketones MCQs from the ECAT past papers
Try each one before opening the answer. Each comes with a short explanation.
- Q1 · ECAT Past Paper 06 · Aldehydes and Ketones
Which functional group is present in both aldehydes and ketones?
- A.Carbonyl
- B.Hydroxyl
- C.Carboxyl
- D.None of the above
Show answer
Answer: A. Carbonyl — Both contain the C=O (carbonyl) group.
- Q2 · ECAT Past Paper 04 · Aldehydes and Ketones
Acetaldehyde can be prepared by oxidizing:
- A.Methyl alcohol
- B.Ethyl alcohol
- C.Acetone
- D.All of the above
Show answer
Answer: B. Ethyl alcohol — Mild oxidation of ethanol gives ethanal (acetaldehyde): CH₃CH₂OH + [O] → CH₃CHO + H₂O.
- Q3 · ECAT Past Paper 03 · Aldehydes and Ketones
The oxidation of ______ always gives a carboxylic acid.
- A.Aldehydes
- B.Phenols
- C.Esters
- D.Propanoic acid
Show answer
Answer: A. Aldehydes — RCHO + [O] → RCOOH; aldehydes are always oxidised to acids with the same number of carbons.