Indicate which of the following statements is true:(A). Three signals will appear in the proton spectrum of CICH=CH2(B). Two signals will appear in the proton spectrum of o-chloromethylbenzene(C). The protons of BrCH2-CH3 with the highest chemical shift are the methyl ones(D). The methyl protons of BrCH2-CH3 give 5 signals

The proton NMR spectrum in Figure 19-40 is for a compound having an empirical formula C4H7BrO2. Identify the compound.

Isoamyl acetate is the primary component of artificial banana flavor. Which signals will be in the positive phase, negative phase, or nonexistent in normal 13C NMR, DEPT-90, and DEPT-135 of isoamyl acetate?

(a) What would be the chemical shift of a peak that is observed at 655.2 Hz from the reference tetramethylsilane (TMS) recorded using a 90 MHz spectrometer ? (b) At what frequency would the chemical shift of chloroform (CHCl3, δ = 7.28 ppm) occur relative to TMS on a spectrum recorded on a 300 MHz spectrometer? (c) At what frequency and chemical shift would the signal for chloroform occur when using a 1 GHz NMR spectrometer?

HO 4. (a) How many different signals would you expect in the 1HNMR of this product? (b) How many different signals would you expect in the 13 CNMR of this product?

A student needs to prepare a ¹H NMR sample for an organic compound soluble in chloroform (CHCI3). The student cannot use CHCI 3 as the solvent for the sample, but rather uses deuterated chloroform (CDC13) because: O CDC13 is more polar. O CDC13 will not produce a signal in the ¹H NMR spectrum, and therefore will not mask the signals of the compound. O The compound will be more soluble in CDCI 3. O CDC13 is cheaper than CHCI 3.

13C(1h) what is bracket mean in this case? is that mean carbon nmr proton nmr in same time?

In a proton NMR spectrum, indicate the number of peaks and their multiplicity for the following compounds:CH3 - CO - CH3CH3 - CH2 - CO - CH3Cl - CH = CH2ortho-chloromethylbenzene

6 of 15 Based on their corresponding nuclear spin number (reported within brackets), determine which of the following nuclei can be studied by NMR spectroscopy. Choose all correct answers. Please, be aware that incorrect answers will result in negative scores. O Nitrogen: 14N(1) O Fluorine: 19F(1/2) O Oxygen: 160(0) O Deuterium: 2H(1) O Carbon: 12c(0) O Proton: 'H(1/2) O Carbon 13: 13C(1/2) O Nitrogen 15: 15N(1/2)

Consider the aromatic compound 4-isopropyl-benzonitrile. (Benzonitrile is a benzene ring with the nitrile group on position 1.)   How many signals for non-equivalent types of protons will be in its proton NMR spectrum?