19. Which is the correet condensed structural formula for the following compound? 4 nis a.) (CH)CHCHCH2(CH),Ct3 (CH),CCH,CHHHCH -c.) (CH),CCHCHCH(CH) (EH,), CCHCHC(CH) d.) 20. Label the following pairs as same compounds, resonance structures, constitutional isomers, different structures. 6 pts. and and Diet erde x and