Discussion
The least acidic among the following compounds
is:
Answer: A
The least acidic compound is M, methyl propiolate.
Its only acidic hydrogen is the terminal alkyne C-H. Even with the ester pulling electron density, removing it leaves the negative charge on carbon, so it is a far weaker acid than any of the O-H acids here.
The others are all O-H acids whose conjugate bases put the charge on oxygen: 3-methoxyphenol (O) has pKa about 10, butanoic acid (N) about 4.8, and benzenesulfonic acid (P), whose anion is spread over three oxygens, is a strong acid with a negative pKa. So the acid strength order is P \(\gt\) N \(\gt\) O \(\gt\) M.
No comment is present. Be the first to comment.
Loading…
Post your comment
Please log in or register to post a comment.
Examination Categories
- SSC Exams
- Banking Exams
- Teaching Exams
- Civil Services Exams
- Railways Exams
- Engineering Recruitment Exams
- Defence Exams
- State Government Exams
- Police Exams
- Insurance Exams
- Nursing Exams
- Other Government Exams
- NRA CET
- PG Entrance Exams
- Campus Placement
- MBA Entrance Exams
- CUET and UG Entrance
- Judiciary Exams
- Regulatory Body Exams
- Software Development