Question

which of the following bonds is the most polar?
a n - h
b o - h
c c - o
d c - h

Explanation:

The polarity of a bond depends on the electronegativity difference between the two atoms. The greater the electronegativity difference, the more polar the bond.

• For \(N - H\): Electronegativity of \(N = 3.04\), \(H= 2.20\). Difference \(=3.04 - 2.20= 0.84\)
• For \(O - H\): Electronegativity of \(O = 3.44\), \(H = 2.20\). Difference \(=3.44-2.20 = 1.24\)
• For \(C - O\): Electronegativity of \(C=2.55\), \(O = 3.44\). Difference \(=3.44 - 2.55=0.89\)
• For \(C - H\): Electronegativity of \(C = 2.55\), \(H=2.20\). Difference \(=2.55 - 2.20 = 0.35\)

Since \(1.24>0.89>0.84>0.35\), the \(O - H\) bond has the largest electronegativity difference.

Answer:

B. \(O - H\)