Question

please explain the correct answer. thank you!

Name: 10. Based on the following structures, answer the following questions on mass spectroscopy. (12 points) OH Br a) Which compound would likely show a M-18 ion? b) Which compound's mass spectrum shows peaks at M and M+2 whose abundances are in the ratio of 3:1? c) Which compound's ion would undergo McLafferty rearrangement? d) Which compounds' ions would undergo a-cleavage? Choose all that apply. B C D E

Answer 1

0 Given compounds BY v By 20H a which compound show m-18 ion ? ani: 0 M OH > 1° alcohols undergo the following fragmentation CH₃ – CH²H OH CH₃-CH The other CH2 - CH2 Mje= 88 me= 70. (m-18) peak. show m and mtd whose 6) Which compound's mass spectrum abundance que in ratio of 3:). ansi- E because el has tvo Liotopes and 32c The ratio of abundance of these Lotopes de 35cl : 34c = 3:1 Hence, in mass spectrum , the chlorine show m and m+ 2 peaks. 19 o which compound's con would undergo Mc Lafferty Maurangema ani ©

Hearrangement occurs when the molecular con contains mydrogen atom, g- hyduogen shift along with B-bond Cleavage Chl-H - CHz ur Ca - Chi, ! CHACH, CH3 T 6 membered cyclic sing OH + 11° + CHE=C—CHz 12 CH3 CH, CHYCH 11/ J B-bond Cleavage d) which compounds' wms would undergo d- Cleavage ? Choose all that apply. and!- ® ©,00 H Ethers undergo No Cleavage + K ketones Aro undergo d- Cleavage ya 7* x-cleauer, tó + osos Crecitz / 70CM vel og eng oacás 017 MXH — CH=CH2, 44,-cig + C =04 11-> alcoholo also undergo dl-cleavage w 1 ľ74 H + - Chachtch, + Chync=ci