and 12. Rationalise the formation of peaks at mle = 122 (M*), 92, 91 (100%), 65 and metastable peaks at mle = 46.4 and 69.4 in the mass spectrum of 2-phenyl ethanol. tho relative intensity of M* is 70, M* + 1
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- D Consider the folleray pairs of mikeuden. Start succintly wofinced spectroscopy & GC MS 6 deyish Some either which molecule which Ć Ө(b) Identify entiotopic/diastereotopic/homotopic magnetically equivalent or non-equivalent. the indicated chromophores well NMR as as as CH3 H CH3 a b H2C-CH3 H H;CWhich amomg the fragments below will be dectected by mass Spectrophotometer? [CH3CH3]+ CH3CH3 •CH2CH3 [CH3CH4]-
- (c) How can the following compounds be distinguished. by . 'H-NMR? . Provide chemical shift, splitting patterns and peak area ratio for each : CH3 --» | -8 (i) CH3 (i) H3COCH,CCCH20CH3 (üi) H;C-C-CH CH C-CH3(c) How can the following compounds be distinguished. by 'H-NMR? Provide chemical shift, splitting patterns and peak area ratio for each: G'2 CH3 CH3 (ü) H3COCH;C=CCH2OCH3 (üi) H3C–C-CH2 CH2-C-CH3How would you use infrared spectroscopy to distinguish between the following pairs of constitutional isomers? and CH3CH₂C=CH (a) CH3C=CCH3 (b) 0 || CH3CCH=CHCH3 (c) H₂C=CHOCH 3 and and 0 || CH3CCH₂CH=CH₂ CH3CH2CHO
- Which amomg the fragments below will be dectected by mass Spectrophotometer? [CH3CH3]+ CH3CH3 •CH2CH3 [CH3CH4]- i and iii only ii ii and iv only i only ii13. A compound with the molecular formula C.lH0 gives a 'H NMR spectrun consisting only of a quartet centered at 6 3.5 and a triplet at & 1.1. The most likely structure for the compound is: A) CH, CH,COH B) CH, сн,оснон C) CH,CH;CH,CH,OH D) CHSCII,OCH;CIHl, E) CH,CHCH,OH CHPQ-2. Which structure would show major fragments in its mass spectrum at 57 and 85 m/z? O O (A) H3C (C) H3C CH3 CH3 (B) H3C (D) H3C CH3 CH3 CH3
- 2. 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? 0a) Predict the proton spectrum chemical shift, coupling and integration of the following molecule? vanillin C8H8O3 b) Also predict its cross-peaks in COSY and 1H-13C HETCOR?Which compound is consistent with the spectrum below? он HO NH2 (A) N(CH3)2 (B) H. (D) (C) LOD 4D00 3000 200 1500 1000 S00 AVENUNG ERI Compound A TEENSMETTRNCEI