Gradebook ng.com/libiscms/mod/ibis/view.php?id 3711418. C 6/12/2017 06:00 PM o/1

Question

Gradebook ng.com/libiscms/mod/ibis/view.php?id 3711418. C 6/12/2017 06:00 PM o/100 Sapung Learning were washed of by accident when the delivery The labels on a shipment of the five chemicals infrared spectra of each of the went through a with the doors open. A dnver student took and no absorptions resuting unknowns. unknown at had a strong, brand IR absorption at 340o 360o om no absorptions above between 1600 and 2900 om unknown #2 had a strong absorption at 1680 om and 3100 am What are the structures of unknowns 1 and 2? Unknown #2 O Previous 8 Give up & View Solution Check Answer 0Next SExt about us careers privay policy terms of use contact us help

Explanation / Answer

Unknown 1 : broad peak at 3400-3600 means it is OH peak. So option is B or D. But D has amide group which should show peak at 1600-1800 range which is categorically said to be absent. So unknown 1 is B.

Unknown 2 : has no peak above 3100 means D not possible as it has a OH group. Options remaining A, C & E. All having a carbonyl group and given that a strong peak is at 1680 cm-1. Normally cyclohexyl carbonyl stretching shows peak above 1700 unless it is in resonance with C=C bond or attached with an aromatic ring which weakens the C=O bond to near 1680. Here in C the carbonyl is in resonance with C=C bond. So unknown 2 is C.

Related Questions

Navigate

• Browse (All)
• Browse G
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.