Question

In which of the folloiwng, the Cl-O bond length is least?

A) ClO- B) ClO2-

C) ClO3- D) ClO4-​

Answer 1

Answer:

B

Explanation:

Bond length∝Bondorder1

Bond order of ClO−=1, 

Bond order of ClO2−=1.5,

Bond order of  ClO3−=1.66 ,

Bond  order of ClO4−=1.75. 

Thus the order of bond length is ClO4−<ClO3−<ClO2−<ClO−, thus correct option is B.

Answer 2

Answer:

In ClO4- the Cl-O bond length is least

So, the order of bond length is ClO4- < ClO3- < ClO2- < ClO-

So the answer is option D

Explanation:

Now first of all let's understand that what is a Bond ?

• A chemical bond is a force between atoms or molecules that allows the formation of chemical compounds.

Now, what is a bond order ?

• Bond order is the total number of covalent bonds that exists between a pair of atoms in a molecule.

What is a Bond length ?

• Bond length is a distance between the nuclei of two chemically bonded atoms.

• And the bond length is inversely proportional to bond order

               Bond length ∝ 1 / Bond order

Now, let's understand the relation between the charge and the bond length:

• Bond length and charge difference are inversely proportional to each other.
• Greater is the charge difference, smaller will be the size of an atom and stronger will be the bond and hence shorter will be the bond length.
• Here, in this case ClO4- has the greater charge difference, so it would make a strong bond due to it's small size and hence it has the least bond length.
• After ClO4-, ClO3- has the smaller charge difference and then ClO2- and then ClO- has the smallest charge difference , so the order of bond length is

                 ClO4- < ClO3- < ClO2-< ClO-

• So the Cl-O bond length is least in ClO4-