N.E. = (10x2+2-12)/2 = 5
=> 1 inel aromatic + 1 dubla leg.
C6H5-CH=CH-C2H5 cis- + trans-
C6H5-C(CH3)=CH-CH3 cis- + trans-
C6H5-CH2-CH=CH-CH3 cis- + trans-
CH3-C6H4-CH=CH-CH3 o-(cis- + trans-) + m-(cis- + trans-) + p-(cis- + trans-)
=> 12 iz. geometrici