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- What is the stretching frequency (in cm-¹) of the following carbonyl? 1745 1715 1685 none of the above1. An aliphatic ketone absorbs at 1,715 cm-1. What is the frequency of this vibration in hertz, which is cycles per second or just per second, reciprocal seconds? 2. What is the energy equivalent of this stretching vibration in kcal/mole? 3. Why does 3,4-diethyl-3-hexene not have a carbon to carbon double bond stretching absorption band? 4. Why does a carbon to oxygen double bond absorption band have a greater intensity than a carbon to carbon double bond absorption band? 5. Using only IR, explain in detail how one could most easily differentiate between oct-1-ene and oct-1-yne if all carbon to carbon bonds are ignored. 6. Using only IR, explain in detail how one could most easily differentiate between butan-1-ol and butanoic acid.1. The energy of a photon is. proportional to its wavelength and proportional to its frequency. (directly or indirectly) 2. Which of the following has a lower characteristic stretching frequency, the C O bond or the C-O bond? Explain briefly. C=0 3. Ethyne HCECH does not show IR absorption in the region 2000-2500 em-! because. 4. Which statement best explains why a carbonyl absorbs infrared radiation at a higher frequency than an alkene absorption?
- Why ester C=O has higher stretching frequency than amide?What is the stretching frequency (in cm¹1) of the following carbonyl? O H O 1685 O 1715 O 1745 ZI H2. a. Determine the structure of the molecule with a molecular formula of C₁1H₁40 that gives rise to the following spectra. IR: LOD TRANSMITTANCEI D Noise (overtones) 4000 ¹H NMR: 12 11 HSP-46-578 1H S 3000 10 HAVENUMBERI-11 (Peaks at 3087, 2968, 2928, 2824, 2732, 1700, 1606) 9 2000 2H 2H d d 8 7 1500 5 4 2H d T 1000 3 1H m 2 6H d 1 500 6 ppm b. What product would result upon addition of (excess) PhMgBr to this compound? 0
- Indicate all electrophilic carbon atoms in the following molecule. Be sure to consider both induction and resonance. A oooooo Blc F □A Пс □D E □E □F D CI1H-nmr signal at 4.2 (d) is due to * 'H NMR Spectrum exchanges with D;0 (200 MHz. CDCI, solution) expansion Expansion 7.0 6.2 ppm 38 3.0 ppm TMS 10 8 7 6 4 3 1 8 (ppm) OH -OCH2 aliphatic C-H Aromatic CH3 aliphatic vinylic HTMS is usually used in NMR as a standard because it is soluble in a variety of solvents. It is, however, insoluble in D20. What is used as a standard in D₂0?@GMU 2020 O CDC13 O Acetone-d6 {CD3(C=O)CD3} O DSS {(CH3)3Si(CH2)3SO3¯Na*} O DMSO-d6 {CD3(S=O)CD3)
- 9 of 15 The range of IR absorption of the C-H stretching vibration of an alkane is: O 2950-2850 cm O 1740-1720 cm O 1439-1399 cm O 2260-2240 cm4. Which of the following compounds has the lowest carbonyl stretching frequency?What is the stretching frequency (in cm-¹) of the following carbonyl? O 1685 O 1655 IZ