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B
decreases stability
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C
increases reactivity
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D
increases energy
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Solution
The correct option is A increases stability
It will increase the stability of the molecules.
Reason:
Resonance mainly deals with the chemical bonding.
But it is to be noted that resonance does not bring equilibrium between the resonant structure it is just a way to represent different modes of describing chemical bonds.
It is also stated that more resonant hybrids, more stable is the structure or molecule.
Let's take an example of resonance of benzene molecule, it has the following resonant hybrids
(Image)
Resonance allows the electron density to spread between the atoms or the bonds thus resulting in less electron-electron repulsion and thus lowers the free energy of the hybrid, and thus increases the stability of the molecule.