which if the following compounds has an intense IR absorption band at 1746 cm-1?
A. CH3CH2OCH2CH3
B. CH3CO2CH3
C. CH3CH2CCH
D. CH3CH2SCH3
which if the following compounds has an intense IR absorption band at 1746 cm-1?
5. For the following pair of compounds, identify the IR absorption band (provide value in cm could be used to distinguish between them. [4 points) ) that он vs Лон
Compound (C5H8O) has a strong IR absorption band at 1745 cm-1. The broad-band proton decoupled 13C spectrum of this compound shows three signals: at ?220 (C), 23 (CH2), and 38 (CH2). Propose a structure for this compound.
For each of the following pairs of compounds, Identify one IR absorption band that could be used to distinguish between them.
The vibration of which bond gives an IR absorption that distinguishes between the following two compounds? CH3 CH2 CH2 OH CH3 CH2 OCH3 What is the approximate wavenumber (cm-1) of that band? Select answer 1050 1250 1450 1700 3500
14. An unknown compound shows an intense IR absorption at 1710 cm- and gives the following NMR spectrum: 8 1.1, doublet, 6Hs; 8 2.1, singlet, 3Hs; and 8 2.3-2.8, broad multiplet, 1H. Which structure is the compound? a) (CH3)2CHOCH3 с) CH:C-O)CH-CH-CH3 ect r b) CH3CH2CH2OCH3 d) (CH3)2CHC(O)CH3 15. This NMR spectrum corresponds to which compound? 2H 1H 1.7 ppm 1H O.5 1.5 1 2 2.5 3.5 4.5 4 5 бн (рpm) b) CH3CH2CH2CH2OH d) CH3CH2CH(OH)CH3 a) (CH3)3COH c) (CH)2СHCH,ОН 13
b) Which of the following will give the most intense alkyne stretching absorption in the IR? Place your answer in a box. H3C= H = `OCH3
action will no Question 6 [1.5 pts] Which one of the following statements about compounds A and B is correct? он он он он CompoundA Compound B Compound A should have the more intense OH IR absorption band Compound B should have the more intense OH IR absorption band None of the above O O Mhat is the maxim
The IR spectrum of a sample contains absorptions at 3050, 2950, and 1620 cm^-1. To what class of organic compound does this sample most likely belong? A) alkane B) alkene C) alkyne D) ester E) alcohol Which of the following most closely matches the C C stretching frequency? A) 3300 B) 3000 C) 2200 D) 1700 E) 1200 What IR absorption is characteristic of the terminal C-H stretch in terminal alkynes? A) 3500 cm^-1 B) 3300 cm^-1 C) 2400 cm^-1...
Question 6 (1 point) What is the expected IR absorption band for a C-H bend in the following compound? 790-840 cm1 12 990 cm 1 15 ● 910cm 718 740 cm1 O 21 Save
1 accompanied by a band at 1050 cm 1 No absorption above 3000 cm 1 is present The functional groups in an organic compound can tequently be deduced rom its n Relative absorption intensity: (s)-strong, ()medium, (w)weak ared absorption ape um. A compound. C3HơOn exhibits intense absorption at 1740 en What functional class(es) does the compound belong to? Liat only classes for which evidence is given here. Attach no significance to evidence not cited explicitly. Do not over-interpret exact absorption...