The $$$M_{\mathrm{r}}$$$ of compound X is 88 . Compound X is heated under reflux with an excess of acidified potassium dichromate(VI) to produce compound $$$Y$$$. Compound $$$Y$$$ reacts with compound $$$X$$$ under suitable conditions to produce compound $$$Z$$$. The $$$M_{r}$$$ of compound $$$Z$$$ is 172 . What is compound $$$X$$$ ?

$\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CHOHCH}_{2} \mathrm{CH}_{3}$

$\left(\mathrm{CH}_{3}\right)_{2} \mathrm{COHCH}_{2} \mathrm{CH}_{3}$

$\left(\mathrm{CH}_{3}\right)_{2} \mathrm{CHCHOHCH}_{3}$

$\left(\mathrm{CH}_{3}\right)_{3} \mathrm{CCH}_{2} \mathrm{OH}$

Chemistry

IGCSE&ALevel

CAIE

Exam No：9701_s24_qp_13 Year：2024 Question No：33

Answer:

8.3.1.1 explain that, in the presence of a catalyst, a reaction has a different mechanism, i.e. one of lower activation energy

8.3.1.2 explain this catalytic effect in terms of the Boltzmann distribution

8.3.1.3 construct and interpret a reaction pathway diagram, for a reaction in the presence and absence of an effective catalyst