Discussion
Among the following, the one having smallest bond angle is
Answer: A
The smallest bond angle is in PH3, about 93°.
The measured angles are roughly NH3 107°, NF3 102°, PF3 98° and PH3 93°.
Going down the group from N to P, the central atom becomes larger and less electronegative. Its bonding pairs sit farther from the nucleus and repel each other less, and the bonds use orbitals of nearly pure p character, so the angle closes toward 90°. That puts both phosphorus compounds below both nitrogen compounds.
Within the nitrogen pair, fluorine pulls the bonding pairs away from N, reducing their mutual repulsion, so NF3 has a smaller angle than NH3. Between the phosphorus compounds, PH3 is the smaller; PF3 is opened slightly by the bulk of the fluorine atoms and by their lone pairs interacting with phosphorus.
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