QUESTION 3 Indicate those of the following statements that are correct for the s

Question

QUESTION 3 Indicate those of the following statements that are correct for the spectra below (Note: The mass 67 peak in the mass spectrum is labelled incorrectly: the correct mass should be 65 instead.) IR Spectrum quid fim) 3000 2000 1600 1200 V (cm) 100 80 60 Mass Spectrum No significont UV absorption above 220 nm 83 M 98/100/102 C2H4CI2 40 80 120 60 200 240 280 m/e 13C NMR Spectrum (S0 0 MHt, CDC solution) proton coupled proton decoupled 200 160 120 40 0 (ppm) H NMR Spectrum 200 MHE, COC soluion expansions 22 20 pom 9 6 (ppm) a. The IR spectrum is consistent with the presence of a C-C group in the molecule b.The mass spectrum peak at mass 83 is consistent with the loss of a methyl group fragment. C.The carbon-13 spectrum indicates that all carbons in the compound are equivalent, and that all carbons are directly attached to two protons. d.The proton NMR indicates that a group representing three protons is next to a group containing a single proton. e. The proton NMR indicates that a group representing one proton is next to a group containing two protons f. The compound is CH2X CH2X where X is Cl or Br g.The compound is CH3 CHX2 where X is Cl or Br

Explanation / Answer

A. False

B. Correct, Since m/z of CH3 - 15 (98-15=83)

C. False, since it has two different carbons

D. Correct since it has CH3-CHCl2 structure

E. False

F. False

G. Correct since it has doublet for CH3 proton and quartet for CH proton in HNMR.

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