chem 高手請入

For carbonyl compounds, aldol condensation will occur in the presence of acid/alkali (H+/OH-required), i.e. they react themselves

Btw for the 1st step, HBr should be added in the presence of other organic solvents (eg CCl4). HBr is not self-ionized during this step

Aldol condensation is also out of DSE syllabus

DSE org chem reaction既 Br2, HBr 洗唔洗寫埋 (in organic solvent) 先有分.
Marking 有時有 有時無 真係唔識分

其實solvent 同 reactact 係一個reaction上係同樣重要，要死記嘅話兩樣都要記。上面嗰題可以係(i)HBr/CCl4 (ii) HBr(g)，嚴格嚟講HBr唔可以，Marking上嘅分別，其實我估係睇嗰年學生點答而會有所調整

明白, thank you.

你DSE level定？

Rate law

只係講到C係1st order reaction, 其中一個reactact concentration (HCl) 會決定嗰rate
D係2nd order, both reactact concentrations 都決定嗰rate

睇返ECS

13) C 你咪當係acid rain reacts with CaCO3，咁rate of reaction 當然慢過D strong acid + strong alkaline neutralisation