Exercise (Module: What are Things Made of)
IJSO Training: What are Things Made of
Exercise
1.
Identify the hybridization of each of the carbon, oxygen and nitrogen atoms in
the following compounds.
(a) caffeine
(b) Tamiflu
O
O
HN
N
N
H 2N
O
O
N
N
O
2.
Which of the following compounds is a stronger acid?
O
Give explanation.
O
H 3C
3.
C
O
H
CH 3CH2OH
Which of the following compounds is a stronger acid?
H2 C
O
C
OH
H2C
Br
F
4.
OH
Which of the following compounds is a stronger acid?
CH 3CH 2CH2CH
O
C
OH
F
5.
6.
7.
O
C
Give explanation.
CH3CHCH2CH2
O
C
Give explanation.
OH
F
Predict the H-O-C bond angle of (CH3)3COH.
Predict the H-C-H bond angle of formaldehyde.
Do the sp2 carbons and the indicated sp3 carbons lie in the same plane?
CH3
CH3
Exercise (Module: What are Things Made of)
8.
List the following compounds in order of decreasing boiling point, and give
explanation.
CH3CH2CH3, CH3OCH3, CH3CH2OH, CH3CH2NH2
9.
Which of the following compounds have zero dipole moment?
H
F
H
F
F
F
H
F
F
H
H
H
10. Draw all the isomers of C5H12.
point.
Explain.
Identify the one that has the lowest boiling
11. Explain why lead compounds were added to petrol in the past, but it is no longer
a current practice.
12. A compound has a molecular formula of C9H10 and has a benzene (phenyl group)
in its structure. Draw all the possible isomers of this compound.
13. Which of the following hydrocarbons has the highest boiling point?
(a) n-Butane (C4H10)
(b) n-Pentane (C5H12)
(c) iso-Pentane (C5H12)
(d) neo-Pentane (C5H12)
14. Which of the following compounds, when used as refrigerants, has the least
adverse effects to the environment
(a) Trichlorofluoromethane (CCl3F, CFC-11)
(b) Dichlorodifluoromethane (CCl2F2, CFC-12)
(c) Chlorodifluoromethane (CHClF2, HCFC-22)
(d) Difluoromethane (CH2F2, R-32)
15. Which of the following compounds is hormone that can trigger fruit ripening?
(a) Ethane
(b) Ethene
(c) Ethanol
(d) Diethyl ether
16. Which of the following compounds is obtained from the reaction of ethanol
(CH3CH2OH) and chloroethane (CH3CH2Cl)?
(a) CH3CH=CHCH3
(b) CH3CH2CH2CH2Cl
Exercise (Module: What are Things Made of)
(c) CH3CH2OCH2CH3
(d) CH3CH2CH2CH2OH
17. What is the name of the following function group?
O
H
(a)
(b)
(c)
(d)
aldehyde
carboxylic acid
ester
alcohol
18. Which of the following compounds has the highest boiling point?
(a) CH3CH2CH3
(b) CH3OCH3
(c) CH3CH2Cl
(d) CH3CH2OH
19. How many compounds that shown below can form cis-trans isomers?
CH 3CH CHCH2 CH3
CH 3C CHCH 3
CH 3
(a)
(b)
(c)
(d)
1
2
3
4
CH 3CH CHCH3
CH 3CH 2CH CH 2