Question

۳۳-۳-rr-T-------- IR Spectrum (KBr disc) 4000 3000 1200 800 2000 1600 V (cm) M ** = 13 Mass Spectrum بالليليللليلعليا % of base peak CgHES 40 80 200 240 280 120 m 160 /e
Based on the following spectroscopic data of an unknown compound with molecular formula C8H6S, (i) determine the chemical structure of this compound; (ii) assign all the signals in the 1H-NMR spectrum & 13C-NMR spectrum. NMR is complete

Answer 1

the structure - - Based on the of unknown given spectral data, compound is : " (ghes ال كلا) C8Hosti IHDD = 2C+2-H+N-X - 268)+9-670-0 -6 IR 8- 3050 cmt =C-H (sp?) stretching 15000n] > C=C stretching 1420 cmt spe =C-H bending 1270 cm) * c-s stretching massi- only DEPT (+) m2=134 - BC-NMRE DEPT chach CH₃ ↑ CHT In this compound 6 CH type carbons and a c type carbons querrtemary) present, → IN DEPT Spectorum, I only 6 positive signals (CH Signals) appeared (@00,000 @= 126.8 ppm (CH) ; = 124.4 ppmccH) ;. 02 - 194.2 ppm (CH); @ 124.7 ppm (CH) ; → 124.8 ppm (cat); 123.0 ppm (CH). proton decoupled8 signals appeared @= 126.8 ppm (CM) ; 6- 124.4 ppm (CH); ©= 140.2 ppm ' 0 - 194.2 ppm (CH) ; @ 124.7 ppm (H) ; ® -.124.8 ppm (ç); * – 123.0 ppm (Cht); 6 = 140.3 ppm (©):. 'HAIMBE {0}7.9-8.0 ppm (two doublets , 34). I L H@ {@,0,0,@} 7.5 ppm (multiplet , 44). HO {0,82 ehti H