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【多选题】
下面哪些信息可以联合确定化合物中有苯环存在( )
A.
在 1750~42000px -1 有强吸收峰
B.
在 3100~75000px -1 有吸收峰
C.
在 3500~80000px -1 有强吸收峰
D.
在 1600~37500px -1 有 2~3 个吸收峰
E.
化合物的不饱和度 ≥4
F.
化合物的不饱和度小于 4
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