Question

The pair of molecules which forms the strongest intermolecular hydrogen bonds is:

• A. $Si{H}_4$ and $Si{F}_4$
• B. $C{H}_3-C{H}_2-C{H}_3$ and $CHC{l}_3$
• C. $HCOOH$ and $C{H}_{3}COOH$
• D. all of the above

Answer 1

Answer: (C)

$HCOOH$ and $C{H}_{3}COOH$

The pair of molecules which forms the strongest intermolecular hydrogen bonds is formic acid $HCOOH$, and acetic acid $C{H}_{3}COOH$. A hydrogen bond is the electrostatic attraction between polar molecules that occurs when a hydrogen $\left(H\right)$ atom bound to a highly electronegative atom such as nitrogen $\left(N\right)$, oxygen $\left(O\right)$ or fluorine $\left(F\right)$ experiences attraction to some other nearby highly electronegative atom.