| Date | May 2015 | Marks available | 1 | Reference code | 15M.1.sl.TZ2.21 |
| Level | SL | Paper | 1 | Time zone | TZ2 |
| Command term | Question number | 21 | Adapted from | N/A |
Question
Which species cannot function as a Lewis acid?
A. \({\text{B}}{{\text{F}}_{\text{3}}}\)
B. \({\text{AlC}}{{\text{l}}_{\text{3}}}\)
C. \({\text{CC}}{{\text{l}}_{\text{4}}}\)
D. \({{\text{H}}^ + }\)
Markscheme
C
Examiners report
Whilst 42% correctly identified \({\text{CC}}{{\text{l}}_{\text{4}}}\) the most popular wrong answer (38%) was the \({{\text{H}}^ + }\) ion.
