Soal IChO Ke-26

THEORETICAL PROBLEM No 5

(10 blue points, 8 red points)

There is only one correct answer to each question

a) What is the correct systematic name (IUPAC name) for the compound below?

(CH₃)₂CHCH(CH₂CH₃)(CH₂CH₂CH₃)

1: 3-Isopropylhexane

2: 2-Methyl-3-propylpentane

3: Ethyl isopropyl propyl methane

4: 3-Hexylpropane

5: 3-Ethyl-2-methylhexane

b) How many isomers, including stereoisomers, containing only saturated carbon atoms, are there for C5H10?

1: 4 isomers 2: 5 isomers 3: 6 isomers

4: 7 isomers 5: 8 isomers

c) Which one of the following compounds has a dipole moment significantly different from zero?

d) Which of the following is a pair of structural isomers?

e) Which of the following five options is the correct order of relative stabilities of cations a and b and c as written below (most stable first)?

1: a>b>c 2: b>c>a 3: c>a>b

4: a>c>b 5: b>a>c

f) What is the correct stereochemical description of the optically active compound drawn below?

1: 1R,3R,4R 2: 1R,3R,4S 3: 1R3S,4R 4: 1S,3S,4R 5: 1S,3S,4S

g) All the molecules drawn below are neutral compounds. Which one does not contain a formal positive charge and a formal negative charge?

1 (CH₃)₃N-B(CH₃)₃ 2 (CH₃)2N-O-CH₃ 3 CH2=N=N

4 (CH₃)₃N-O 5 F₃B-O(CH₃)₂

h) Which one of the IR-spectra shown below does benzaldehyde give rise to? (spectra are not enclosed in this report)

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