Page 33 - Q & A STPM 2022 Chemistry

Chemistry Term 3 STPM Chapter 14 Introduction to Organic Chemistry

CH 3
&
2-Chloro-2-methylpropane
CH 3 !C!CH 3
&
Cl
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(b) 2-Chlorobutane
H
&
CH 3 CH 2 !C*!CH 3
&
Cl

Section C Essay Questions

Question 4
Compound X has the following structure:

CH 3
&
CH 3 !CH 2 !C!CH"CH!CH 3
&
NH 2
X exhibits geometrical isomerism and optical isomerism.
(a) Name X according to the IUPAC convention.

(b) State what do you understand by the terms:
(i) geometrical isomerism
(ii) optical isomerism
(c) Draw the:
(i) geometrical isomers of X
(ii) optical isomers of X
(d) How would you differentiate the two optical isomers of X? Name the
instrument used and state what quantity does it measure.

Answer:
(a) 3-Amino-3-methyl-4-hexene Term
(b) (i) Geometrical isomerism is the occurrence of different compounds
having the same molecular formula, the same structural formula, but 3
are different due to the different spatial arrangement of atoms/group
of atoms on either side of a C"C double bond or a cyclic structure.

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