Question

# In each group of three bonds, which bond is likely to be the most polar? Which will be the least polar? (a) $\mathrm{C-H}, \mathrm{O-H}, \mathrm{S-H}$, (b) $\mathrm{C-Cl}, \mathrm{Cl-Cl}, \mathrm{H-Cl}$, (c) $\mathrm{F-F}, \mathrm{O-F}, \mathrm{C-F}$, (d) $\mathrm{N-H}, \mathrm{N-O}, \mathrm{N-Cl}$

Solution

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PART A:

Calculate the electronegativity difference between carbon and hydrogen.

\begin{align*} 2.5-2.1 &= 0.4 \end{align*}

Calculate the electronegativity difference between oxygen and hydrogen.

\begin{align*} 3.5-2.1 &= 1.4 \end{align*}

Calculate the electronegativity difference between sulfur and hydrogen.

\begin{align*} 2.5-2.1 &= 0.4 \end{align*}

$\mathrm{O-H}$ has the most polar bond because it has the largest electronegativity difference. $\mathrm{C-H}$ and $\mathrm{S-H}$ have the least polar bond because they have the smallest electronegativity difference.

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