Question

Which of the following has Highest bond angle. CH4,BF2,NH3

Answer 1

Answer:

hosphine, PH3, has the smallest bond angle… very close to 90 degrees (~93 degrees). One way to justify it is by acknowledging that there is no hybridization of the bonds in phosphorous. The bonding involves overlap with p-orbitals which are at right angles. Therefore, a near 90 degree bond angle is found in PH3.

Since C, N and O are in the second period we can ascribe hybridization to the orbitals of those central atoms. CH4 follows from the “pure” tetrahedral bond angles, 109.5 degrees. The bond angles in NH3 and H2O — which both have four electron pairs — is based on the tetrahedral arrangement with some distortion caused by the lone pairs. Since the oxygen in water has two lone pairs, the distortion is greatest, resulting in a bond angle of about 105 degrees. Nitrogen has only one lone pair and is distorted to about 107 degrees

Explanation: