DP Chemistry (last assessment 2024)

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Question 21N.1.sl.TZ0.30

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Date November 2021 Marks available [Maximum mark: 1] Reference code 21N.1.sl.TZ0.30
Level sl Paper 1 Time zone TZ0
Command term Deduce Question number 30 Adapted from N/A
30.
[Maximum mark: 1]
21N.1.sl.TZ0.30

What can be deduced from the mass spectrum of CH3COCH2CH2CH3?

NIST Mass Spectrometry Data Center Collection (C) 2021 copyright by the U.S. Secretary of Commerce on behalf of the United States of America. All rights reserved. 2-Pentanone Mass Spectrum, MS Number 291264. [graph] Available at: https://webbook.nist.gov/cgi/cbook.cgi?ID=C107879&Units=SI&Mask=200#Mass-Spec2-pentanone [Accessed 4 May 2020]. source adapted.


A.  The molar mass is 43 g mol−1.

B.  The atoms have many isotopes.

C.  The most likely bond to break is C–C between carbons 2 and 3.

D.  The signal with the largest mass is due to the oxidation of the ketone in the spectrometer.

[1]

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C

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