| Date | May 2015 | Marks available | 1 | Reference code | 15M.1.hl.TZ1.36 |
| Level | HL | Paper | 1 | Time zone | TZ1 |
| Command term | Question number | 36 | Adapted from | N/A |
Question
What should be changed to alter the rate of nucleophilic substitution of tertiary halogenoalkanes?
A. The nucleophile
B. The concentration of the nucleophile
C. The concentration of the tertiary halogenoalkane
D. The size of the reaction flask
Markscheme
C
Examiners report
Students found this question one of the more difficult ones with 32.32% correct answers. Tertiary halogenoalkanes undergo SN1 reaction mechanism in which the rate of reaction is only first order with to the concentration of the halogenoalkane; thus choice C was the correct answer.
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