Question

2) Which is the most reasonable structure for a compound with this IR spectrum? Wavelength, (um) 2.2 2.4 2.6 3 3,5 4 4,5 5 5,5 6 1 8_9 10 11 12 13 14 16 MAN 4600 4000 3500 3000 2500 2000 1500 Wavenumber, (cm) 1000 800 600 (A) (B) ОН CH3(CH2)4-C=C-COCH; CH(CH2)3-C=C-CHCH (C) (D) H-C=C-(CH2)4CCH3 CH3(CH2)4-CH=CH-CH 3) Which structure is consistent with following IR spectrum? * 2.527 3 Wavelength, (um) 3,5 4 4,5 5 5,5 6 6,5 7 8 9 10 12 14 18 NARAI OCE- SCU 4000 3500 3000 2500 2000 1800 1600 1400 12001000 800 600 400 Wavenumber, (cm) (4) chýchch&CH, chschchem (C) OH (D) CH3CH2CH2CHCH CH3CH2CH2CH2COCHz

Answer 1

en For alleynes the characteristic peale is be 2100-2260 ein' for cac stretching. But Since there are no peaus near the range. 3260 - 3300 un' for C-H stretch so the compound is not a terminal alkyne. Now it may be ophon 6 or 6. As there is no pear for at streltch at 24ooreen! Hence moet reasonable compound is ophon A (- co peak appease near 1700 unit, sp3 -c-H shetch appeass nedo 2900 cm! -c-o stretch at 1000-1300 cm

3 . In the spectrum , clearly it can be seen that a broad peak is there! at a range of 3 uoor 3100cm, which reprevents –OH stretch. All other options don't have o H greces Hence ② is the correct option. Also there is no - co streching peak Thus ♡ is the compound.