Química Orgânica I
TP1A
Nome_________________________________________
Nº
____________ Curso ______________ Nota ___________
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
1) Which of the following statements correctly describes the third electron shell that surrounds the
nucleus of an atom?
A) The maximum number of electrons that can occupy the third shell is 18.
B) The total number of atomic orbitals present in the third shell is 16.
C) The third shell can contain f orbitals.
D) The third shell contains only s and p atomic orbitals.
E) All third shell elements must have d electrons.
1)
2) The compound methylamine, CH3 NH2 , contains a C-N bond. In this bond, which of the following
best describes the charge on the nitrogen atom?
A) -1
B) uncharged
C) +1
D) slightly negative
E) slightly positive
2)
3) Which of the following contain(s) polar covalent bonds?
A) NH3
B) H2
C) KF
D) Na2 O
E) both A and C
3)
4) Which of the following covalent bonds has the largest dipole moment?
A) C-C
B) H-F
C) C-H
D) C-O
4)
E) H-N
5) The formal charge on nitrogen in the compound below is __________.
A) 0
B) -2
C) -1
D) +1
1
5)
E) +2
6) Which of the following is the most likely electronic structure for C2 H2 ?
A) HCCH
B)
6)
C)
D)
E)
SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question.
7) Draw condensed structures for the four compounds with formula C3 H9 N.
7)
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
8) Which carbon(s) in the following molecule is (are) sp hybridized?
8)
A) carbon 2
B) carbons 4
C) carbons 1, 3
D) carbon 1
E) carbon 4, 5
9) Which bond in the following molecule is the shortest?
A) bond 1
B) bond 2
C) bond 3
2
9)
D) bond 4
E) bond 5
10) Which of the following species have tetrahedral bond angles?
10)
A) A and E
B) D only
C) A, D, E and F
D) A, B and E
E) A, D and E
11) The carbon-carbon double bond in ethene is __________ and __________ than the carbon-carbon
triple bond in ethyne.
A) weaker; longer
B) stronger; shorter
C) weaker; shorter
D) stronger; more polar
E) stronger; longer
11)
SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question.
12) If H2O has a pKa value of 15.7 and HF has a pKa value of 3.2, which is a stronger base,
HO- or F- ? Explain.
12)
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
13) Which of the following is the strongest acid?
A) CH3 OH2+
13)
B) CH3 NH3 +
C) CH3 NH2
D) CH3 OH
E) H2N-
3
14) Which of the following is the strongest acid?
A) I
B) II
14)
C) III
D) IV
E) V
15) The pKa of CH3 COOH is 4.8 and the pKa of HCOOH is 3.8. Given this information, one knows
that __________.
A) HCOOH reacts with HO- while CH3COOH does not
B) CH3 COOH completely ionizes in water
C) HCOOH is a weaker acid than CH3 COOH
D) CH3 COOH reacts with HO- while HCOOH does not
E) HCOO- is a weaker base than CH3COO -
4
15)
Answer Key
Testname: UNTITLED1
1) A
ID: oc5b 1-6
Diff: 0
2) D
ID: oc5b 1-8
Diff: 0
3) A
ID: oc5b 1-11
Diff: 0
4) B
ID: oc5b 1-12
Diff: 0
5) D
ID: oc5b 1-16
Diff: 0
6) A
ID: oc5b 1-17
Diff: 0
7) CH3 CH2CH2 NH2
CH3 CH2NHCH3
(CH3 )2CHNH2
(CH3 )3N
ID: oc5b 1-22
Diff: 0
8) E
ID: oc5b 1-37
Diff: 0
9) E
ID: oc5b 1-48
Diff: 0
10) C
ID: oc5b 1-49
Diff: 0
11) A
ID: oc5b 1-50
Diff: 0
12) HO- is a stronger base than F- because HF is a stronger acid than H2 O, and the stronger the acid the weaker its
conjugate base.
ID: oc5b 1-70
Diff: 0
13) A
ID: oc5b 1-71
Diff: 0
14) E
ID: oc5b 1-76
Diff: 0
15) E
ID: oc5b 1-72
Diff: 0
5