Discussion
Which of the following molecules will NOT exhibit a temperature dependent 19F NMR spectrum ?
Answer: D
The molecule without a temperature-dependent 19F spectrum is SF6.
In octahedral SF6 all six fluorines are equivalent and the molecule is rigid, so its 19F spectrum is a single line at every temperature.
The other three are fluxional. In trigonal bipyramidal PF5 and PCl2F3, axial and equatorial fluorines differ, but Berry pseudorotation exchanges them; at room temperature the signals average, and only on cooling can separate environments appear. T-shaped ClF3 has two kinds of fluorine whose signals are resolved at low temperature and coalesce on warming as the fluorines exchange.
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