J.R. S. answered 01/29/24
Ph.D. University Professor with 10+ years Tutoring Experience
The hydrogens on C1 and C6 give 1 signal
The hydrogens on C2 and C4 give 1 signal
The hydrogens on C3 and C5 give 1 signal
The hydrogens on the substituent methyl groups give 1 signal
Total = 4 unique signals