Question

Arrange the following in the ascending order of the number of covalent bonds present in them.

(a) ${\mathrm{N}}_2$

(b) ${\mathrm{O}}_2$

(c) ${\mathrm{H}}_2$

(d) ${\mathrm{CO}}_2$

• A. abcd
• B. dabc
• C. bcda
• D. cbad

Answer 1

The correct option is D

cbad

Explanation of the correct option:

Covalent bond is formed between two non-metal atoms by sharing two electrons each from both the elements.

(A) ${\mathrm{N}}_2$: Nitrogen molecule (${\mathrm{N}}_2$) has three covalent bonds. The structure is given below:

$:\mathrm{N}\equiv \mathrm{N}:$

(B) ${\mathrm{O}}_2$: Oxygen molecule (${\mathrm{O}}_2$) has two covalent bonds. The structure is given below:

$:\stackrel{..}{\mathrm{O}}=\stackrel{..}{\mathrm{O}}:$

(C) ${\mathrm{H}}_2$: Hydrogen molecule (${\mathrm{H}}_2$) has one covalent bond. The structure is given below:

$\mathrm{H}-\mathrm{H}$

(D) ${\mathrm{CO}}_2$: Carbon dioxide (${\mathrm{CO}}_2$) has four covalent bonds. The structure is given below:

$:\stackrel{..}{\mathrm{O}}=\mathrm{C}=\stackrel{..}{\mathrm{O}}:$

So, the order of increasing number of covalent bonds will be: ${\mathrm{H}}_2<{\mathrm{O}}_2<{\mathrm{N}}_2<{\mathrm{CO}}_2$. Hence, the order will be cbad.

Therefore, the correct option is (D).