DP Chemistry (last assessment 2024)

Test builder »

Question 22M.2.hl.TZ1.5a(iii)

Select a Test
Date May 2022 Marks available [Maximum mark: 1] Reference code 22M.2.hl.TZ1.5a(iii)
Level hl Paper 2 Time zone TZ1
Command term State Question number a(iii) Adapted from N/A
a(iii).
[Maximum mark: 1]
22M.2.hl.TZ1.5a(iii)

Organomagnesium compounds can react with carbonyl compounds. One overall equation is:

(a(iii))

State the number of σ (sigma) and π (pi) bonds in Compound A.

[1]

Markscheme

σ: 9
AND
π: 1 ✔

Examiners report

Mediocre performance in stating the number of σ (sigma) and π (pi) bonds in propanone; the common answer was 3 σ and 1 π instead of 9 σ and 1 π, suggesting the three C-H σ bonds in each of the two methyl groups were ignored.

Syllabus sections