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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- (a) What mass spectral fragments are formed by a cleavage of butan-2-ol, CH3CH(OH)CH2CH3?(b) What fragments are formed by dehydration of butan-2-ol?(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]-
- D Consider the folleray pairs of mikeuden. Start succintly wofinced spectroscopy & GC MS 6 deyish Some either which molecule which Ć Ө(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? 0What mass spectral fragments are formed from a cleavage of 2-pentanone, CH3COCH,CH,CH3?Predict the masses and the structures of the most abundant fragments observed in the mass spectra of the followingcompounds.(a) 2-methylpentane (b) 3-methylhex-2-ene (c) 4-methylpentan-2-ol(d) 2-methyl-1-phenylpropane