C-NMR has a peak 19ppm what does it means？which carbon in the compound represents 19 ppm？lable out please？

draw fragment ion  that corresponds to the Base peak in each spectra. compound given.

▪ True or False: Mass spectra are like a fingerprint. Every compound has a unique one. ▪ Which mode of GCMS operation has more sensitivity and why? A) SIM. More time at each m/z ▪ B) Full Scan. More time at each m/z ▪ C) SIM. Less time at each m/z

Below are three MS spectra, Spectra 1, 2, and 3. Each of this mass spectrum corresponds to either Compound A (contains one Cl in the molecular formula), Compound B (one I in the molecular formula), and Compound C (one Br in the molecular formula). Identify which spectra corresponds to which compound. Provide explanations for your choices.

3- Show (draw) or print or bring the 1H-NMR spectra and 13C-NMR spectra for diethylETHER.

Propyl Bromide

8 16) Chemical Formula: C.H₂O₂ IR: strong peak 1720cm-1 3H 17) Chemical Formulae: C12H18 4H, Doublet Triplet Triplet Doublet 3 5H Unknowns for 1H NMR Final Report 6 5 18) Chemical Formula: C₂H120 IR: Strong broad peak at 3200 cm-¹ 2H 5 1H 2 PPM 4 PPM 1H Quartet, 2H PPM 3 3H Singlet, 9H Triplet, 3H 2H 3H 0

15. In a mass spectrum, will the molecular ion peak always be the base peak? A yes no