Ncert Exercises & Solutions

Identify more than one correct resonance structure of carbon dioxide from the ones given below:

a. $^{-} O - C = O^{+}$

b. $O = C = O$

c. $^{-} O \equiv C - O^{+}$

d. $^{-} O - C \equiv O^{+}$

Choose the correct option:

1.	a and b	2.	b and c
3.	c and d	4.	b and d

Hint: A structure with a negative charge on the more electronegative atom will be more stable.

Resonance is a way of describing delocalized electrons within certain molecules or polyatomic ions where the bonding cannot be expressed by a single Lewis formula. A molecule or ion with such delocalized electrons is represented by several resonance structures.

The resonating structure of CO₂ are:

$O = C = O \leftrightarrow {}_{+}O \equiv C - O^{-} \leftrightarrow {}_{-}O - C \equiv O^{+}$

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