Page 30 - Q & A STPM 2022 Chemistry

Chemistry Term 3 STPM Chapter 14 Introduction to Organic Chemistry
(b) CH 3 CH 2 CH 2 CH 2 Br 1-Bromobutane
*
CH 3 CH 2 !CH!CH 3 2-Bromobutane is chiral
&
Br
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CH 3
&
CH 3 —CH—CH 2 Br 2-Methyl-1-bromopropane

CH 3
&
2-Bromo-2-methylpropane
CH 3 —C—CH 3
&
Br

14.3 Functional Groups: Classification and Nomenclature

Section A Multiple-choice Questions

Question 1

The structural formula of cholesterol is shown below:

H C CH
3
C 3
CH 3 CH 3
CH
3

HO

Which of the following statements is not correct regarding cholesterol?
A The hybridisation of the carbon atoms includes sp and sp only.
3
2
B Its molecular formula is C 27 H 46 O 2 .
C It contains the hydroxy and alkene functional groups.
D The molecule is not planar.

Answer: B
The structural formula shows only one oxygen atom. Thus, B cannot be correct.
Term
For A, there are only two types of carbon-carbon bonds in the molecules. They
3 are C—C (sp ) and C=C (sp ).
3
2
For D, molecules with sp hybridised carbon atoms are tetrahedral (three
3
dimensional).
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14 Q&A STPM Chem T3 Layout.indd 346 4/19/19 5:29 PM