Question

which of these covalent bonds is polar, based on the electroneg? c - n o - o

Explanation:

Step1: Recall polarity concept

A polar covalent bond has an electronegativity difference between the two atoms.

Step2: Find electronegativities

From the periodic - table of electronegativities (not fully shown in the question but known values: C has an electronegativity of 2.5, N has an electronegativity of 3.0, O has an electronegativity of 3.5).

Step3: Calculate electronegativity differences

For C - N: $\vert3.0 - 2.5\vert= 0.5$. For O - O: $\vert3.5 - 3.5\vert = 0$.

Step4: Determine polarity

A non - zero electronegativity difference indicates a polar bond. Since the electronegativity difference for C - N is 0.5 (non - zero) and for O - O is 0 (zero), the C - N bond is polar.

Answer:

C - N