The diagram shows the structure of the naturally occurring molecule cholesterol. Student X stated that the 17 carbon atoms in the 4 rings all lie in the same plane. Student Y stated that this molecule displays cis/trans isomerism at the $$$\mathrm{C}=\mathrm{C}$$$ double bond. Which students are correct?

both student $X$ and student $Y$

neither student $X$ nor student $Y$

student X only

student $Y$ only

Chemistry

IGCSE&ALevel

CAIE

Exam No：9701_m24_qp_12 Year：2024 Question No：25

Answer:

Knowledge points:

14.1.1.1 addition of hydrogen to an alkene in a hydrogenation reaction, H2(g) and Pt/Ni catalyst and heat

14.1.1.2 cracking of a longer chain alkane, heat with

14.1.2.1 the complete and incomplete combustion of alkanes

14.1.2.2 the free-radical substitution of alkanes by in the presence of ultraviolet light, as exemplified by the reactions of ethane

14.1.3 describe the mechanism of free-radical substitution with reference to the initiation, propagation and termination steps

14.1.4 suggest how cracking can be used to obtain more useful alkanes and alkenes of lower from heavier crude oil fractions

14.1.5 understand the general unreactivity of alkanes, including towards polar reagents in terms of the strength of the C–H bonds and their relative lack of polarity

14.1.6 recognise the environmental consequences of carbon monoxide, oxides of nitrogen and unburnt hydrocarbons arising

Answer:

Knowledge points:

Solution:

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