$*)Axit:$$CH_2=CH-CH_2-COOH ; cis,trans-CH_3-CH=CH-COOH$$*)Este:$$HCOO-CH_2-CH=CH_2 ; cis,trans-HCOO-CH=CH-CH_3$$CH_3-COO-CH=CH_2 ; CH_2=CH-COO-CH_3$
$*)Axit:$$CH_2=CH-CH_2-COOH ; cis,trans-CH_3-CH=CH-COOH$$*)Este:$$HCOO-CH_2-CH=CH_2 ; cis,trans-HCOO-CH=CH-CH_3$$CH_3-COO-CH=CH_2$
$*)Axit:$$CH_2=CH-CH_2-COOH ; cis,trans-CH_3-CH=CH-COOH$$*)Este:$$HCOO-CH_2-CH=CH_2 ; cis,trans-HCOO-CH=CH-CH_3$$CH_3-COO-CH=CH_2
; CH_2=CH-COO-CH_3$