The question refers to the following species. (A) H2O (B) NH3 (C) BH3 (D) CH4 (E) SiH4 Is predicted to have the largest bond angle

The specie that has the largest bond angle in the context of the question is BH3.

The bond angle is defined as the angle formed between two atoms that are bonded to the same central atom.

Bond angles can be predicted on the basis of the valence shell electron pair repulsion theory (VSEPR).

According to the theory, tetrahedral species have a bond angle of 109°. The species; H2O,  NH3, CH4, SiH4 have four electrons on the outermost shell of the central atom and their molecular geometry is based on a tetrahedron.

However, owing to the presence of lone pairs of electrons on the central atoms of the some molecules; H2O and NH3 deviates from the expected tetrahedron. NH3 is trigonal pyramidal while H2O is bent. Both have bond angles less than the predicted 109°.

BH3 is trigonal planar and has a bond angle of 120°.

Hence, based on the prediction of VSEPR theory, BH3 has the largest bond angle.

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