Resonance is a way of describing delocalized electrons within certain molecules. Here, the bonding cannot be expressed by a single Lewis formula.
When a nuclei are in an EM radiation with a proper frequency, the nuclei aligned with the field will absorb energy and spin flip. When the spin flip happens, the nuclei are said to in resonance with the field. Thus, this technique is NMR ( Nuclear magnetic resonance).
How to calculate peaks due to spin spin coupling?
In general NMR resonance will split into (n+1) peaks where n is the number of hydrogens on the adjacent atom due to spin spin coupling.
So, for group A, n=3
Therefore, number of peaks in group A's NMR signal =3+1=4
Therefore, 4 peaks is the main answer
A quartret will be formed in 1:3:3:1 ratio.
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