Page 463 - SUBSEC October 2017_Neat

02212020/CAPE/SPEC/MS/2017
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CHEMISTRY
UNIT 2 — PAPER 02
MARK SCHEME
KC UK XS
(f)  Vapourised sample may be broken into positively charged
fragments by bombardment with high-speed electrons.

 Fragments are deflected in a magnetic field,

proportionate to the mass/charge ratio. 3

 These fragments can be used to deduce the structure of
the original molecule.
[1 mark each]

(g) (i) 46 [1 mark] 1

(ii) J [1 mark] 1

(iii) B: CH3
C: OH
F: CH2OH

[3 marks]
3
3
(iv) x 100% = 43% [1 mark] 1
7
1
(v) Most stable fragment [1 mark]

10 15 5
Total 30 marks

Question 3