Question

Trimethyl phosphine oxide is stable because __________.

• A. It has two resonating structure.
• B. Phosphurus-oxygen double bond has high dissociation energy.
• C. Both (A) and (B).
• D. None of the above.

Answer 1

The correct option is C Both (A) and (B).

The resonating structures of trimethyl phosphine are-

$(C{H}_3{)}_3\stackrel{+}{P}-\stackrel{-}{O}\leftrightarrow (C{H}_3{)}_{3}P=O$

Trimethyl phosphine has two resonating structure, because of this phosphorus-oxygen double bond has high dissociation energy.