Which type of covalent bond is the shortest and the strongest
a. single bond
b. double bond
c. triple bond
d. ionic bond

c. triple bond

Explanation:

Triple bonds are shortest and strongest covalent bond occur when six electrons are shared between two atoms.Bond strength is directly proportional to the amount of energy required to break the bond between the two atoms. The more energy required, the strongest the bond is . Bond length is the distance between two bonded atoms nuclei.Triple bonds are shorter and stronger than double bonds. While double bonds have shorter distances than single bonds.

Cr(oh)3 -> cr(3+) + 3oh-