Question

the diagrams in the box represent the lewis dot structures for different molecules. which molecule would be polar based on its lewis dot structure?

Explanation:

Step1: Analyze molecule A

$H - H$ is non - polar as it has identical atoms and equal sharing of electrons.

Step2: Analyze molecule B

$O=O$ is non - polar since it has the same atoms and symmetric electron distribution.

Step3: Analyze molecule C

$NH_3$ has a lone pair on nitrogen. The nitrogen is more electronegative than hydrogen. The electron - density is pulled towards nitrogen, creating a polar bond and a net dipole moment due to the trigonal pyramidal shape, making it polar.

Step4: Analyze molecule D

$CH_4$ has a tetrahedral shape and the electronegativity difference between C and H is small. The bond dipoles cancel out, making it non - polar.

Answer:

C.