Question
Which from the following aldehydes contains two - CHO groups in a molecule?
MHT CET
Chemistry
General Organic Chemistry
2026
MHT CET 2026 (19 April Shift 1)
MHT CET Chemistry Question (2026) — Solution
Options
- A. Acrolein
- B. O-Tolualdehyde
- C. Phthaldehyde
- D. Butyraldehyde
Answer
C. Phthaldehyde
Step-by-step solution
Acrolein is CH _2= CH - CHO , which contains one - CHO group. o-Tolualdehyde is o- CH _3- C _6 H _4- CHO , which contains one - CHO group. Phthaldehyde is benzene-1,2-dicarbaldehyde, C _6 H _4( CHO )_2, which contains two - CHO groups. Butyraldehyde is CH _3- CH _2- CH _2- CHO , which contains one - CHO group. Therefore, phthaldehyde contains two - CHO groups. Answer: Phthaldehyde
Related: Chemistry — General Organic Chemistry · All PYQ Banks