Answer :
The number of unique H¹ NMR ( proton nuclear magnetic resonance) signals for each compound is it shows only one signal.
The benzene contains the 6 carbon atoms and the 6 hydrogen atoms. the benzene have six protons and all the six protons are the chemical equivalent. they have the same bonding and have the same chemical environment to the each other. they have the same resonance frequency in the H¹ NMR signal in the experiment . that's the reason that the benzene shows only one signal.
Thus, benzene show one signal for the unique H¹ NMR , proton nuclear magnetic resonance experiment.
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