Given the electronegativities below, which covalent single bond is most polar? element: h c n o electronegativity: 2.1 2.5 3.0 3.5

The choices present in this question are:
a) N-H      b) O-C     c) O-N     d) C-H     e) O-H

The values of electronegativity given:
H = 2.1     C = 2.5   N = 3.0    O = 3.5

To determine the most polar bond we calculate the electronegativity difference in each bond and determine the highest value:
a) N-H = 3.0 - 2.1 = 0.9
b) O-C = 3.5 - 2.5 = 1
c) O-N = 3.5 - 3 = 0.5
d) C-H = 2.5 - 2.1 = 0.4
e) O-H = 3.5 - 2.1 = 1.4
So the correct answer is e) O-H
 

The higher difference in the electronegativity has been in the O-H bond, the most polar bond is O-H.

The polarity of the bond can be defined as the difference in electronegativity.

For N-H bond:

Electronegativity of N - Electronegativity of H

= 3 - 2.1

= 0.9

For O-C bond:

Electronegativity of O - Electronegativity of C

= 3.5 - 2.5

= 1

For O-N bond:

Electronegativity of O - Electronegativity of N

= 3.5 - 3

= 0.5

For C-H bond:

Electronegativity of C - Electronegativity of H

= 2.5 - 2.1

= 0.4

For O-H bond:

Electronegativity of O - Electronegativity of H

= 3.5 - 2.1

= 1.4

Since the higher difference in the electronegativity has been in the O-H bond, the most polar bond is O-H.

For more information about the polar bonds, refer to the link:

link

Mgo2 is the oxidation state of manganese oxide

You can still be friends with each other. you don't have to date since he likes someone else. just stick to being friends for now