In which of the following compounds, the underlined element does not' have eight electrons in the outer shell.
Correct answer: A. BF3
- A. BF3
- B. H2O2
- C. PCl3
- D. PCl5
Explanation
The correct answer is BF3. In BF3, boron has only six electrons in its outer shell, resulting in an incomplete octet. Boron is one of the few elements that can be stable with less than eight electrons in its valence shell.In contrast, H2O2 and PCl3 both have elements that complete the octet rule with eight electrons in their outer shells. PCl5 has phosphorus with an expanded octet, containing ten electrons, not an incomplete octet.
Last updated
About Chemical Bonding
Chemical bonding explains molecular shape through VSEPR theory and distinguishes sigma bonds from pi bonds. Questions involve hybridization, bond angles, dipole moment and bond energy, including how electron-pair repulsion determines geometry and how bond polarity differs from the overall polarity of a molecule.
Practise Chemical Bonding
964 free Chemical Bonding MCQs from Chemistry, each with the correct answer and an explanation. Unlimited attempts, no account needed.
Exams that ask Chemistry questions like this
Chemistry is on 12 papers prepared for on TestUstad, and all of them draw the same bank, so this question is worth knowing for every one of them.
Related questions
50% inversion of configuration and 50% retention of configuration observed is characteristics of mechanism:
A bonding electron pair is attracted by of atoms?
A Cl₂ molecule is formed by the overlap of:
A co-ordinate covalent bond is present in:
A covalent bond formed by the parallel overlap of p-orbitals is a weaker bond called: