Question

Which of the following statement is not true?

• A. $CC{l}_4$ has higher boiling point that $CHC{l}_3$.
• B. The $H{F}_2^{–}$ ion exists in the solid state and in liquid HF solution, but not in dilute aqueous solutions.
• C. Hydrogen bonding maintains the planar $H_{3}B{O}_3$ units in layers in solid state.
• D. None of these

Answer 1

The correct option is D None of these

a)There is a stronger van der Waals' forces of attraction between the molecules in $CC{l}_4$ compound than in $CHC{l}_3$. so $CC{l}_4$ has higher boiling point.
b) In the solid state and in liquid $HF$, the $H{F}_2^{–}$ ion is held together by hydrogen bonding. In aqueous solutions there
is hydrogen bonding but each HF molecule forms hydrogen
bonds with the much more prevalent $H_{2}O$ present, instead of with other HF molecules and $H_3{O}^{+}$ and $F^{–}$ are much more likely to be formed.
c) $H_{3}B{O}_3$ (solid) has inter molecular hydrogen bonding.