Question

Statement 1 : $NF_3$ has little tendency to act as a donor molecule.
Statement 2 : The highly electronegative $F$ atoms attract electrons and these moments partly cancel the moment from the lone pair.

• A. If both Statement $1$ and Statement $2$ are true and the statement $2$ is the correct explanation of the statement $1$
• B. If both Statement $1$ and Statement $2$ are true but statement $2$ is not the correct explanation of the statement $1$
• C. If Statement $1$ is true but Statement $2$ is false
• D. If Statement $1$ is false but Statement $2$ is true

Answer 1

Answer: (A)

Bond dipoles of $N — F$ bonds are counter balanced to some extent by the dipole moment of lone pair of electron acting in opposite direction. This reduces both the dipole moment and its donor powers.