romasko (qrr58) – Homework 5 – sutcliffe – (50985)
1
This
printout
should
have
22
questions.
Multiplechoice questions may continue on
the next column or page – find all choices
before answering.
Questions 1 through 13 deal with VB the
ory, the rest with MO theory.
001
10.0 points
Which of the following combinations of hy
bridization and molecular geometry is possi
ble?
1.
sp
3
d
: tetrahedral
2.
sp
3
: trigonal pyramidal
correct
3.
sp
2
: tetrahedral
4.
sp
2
: linear
5.
sp
3
: trigonal planar
6.
sp
3
: octahedral
7.
sp
3
d
: octahedral
8.
sp
3
: trapezoidal
Explanation:
Use the hybridization to confirm the elec
tronic geometry;
e.g.
,
sp
2
means three hybrid
orbitals, three RHED and a trigonal planar
electronic geometry.
Verify if the molecular geometry is possible
for the given electronic geometry: for exam
ple, for trigonal planar electronic geometry,
only trigonal planar and bent are possible.
002
10.0 points
The
sp
3
hybridization has what percent
s
character and what percent
p
character?
1.
50%; 50%
2.
75%; 25%
3.
25%; 75%
correct
4.
67%; 33%
5.
33%; 67%
Explanation:
s
=
1
4
= 25%
p
=
3
4
= 75%
003
10.0 points
A molecule AB
3
has eight shared electrons
and follows the normal octet rule. The central
atom is “A”.
The atoms surrounding A are
represented by B. Pick the true statement.
1.
It is a polar molecule.
2.
It has one lone pair of electrons on A.
3.
It must be an anion.
4.
It has linear molecular shape.
5.
It is
sp
3
hybridized.
6.
It has two single bonds and two double
bonds.
7.
It exhibits resonance.
correct
Explanation:
The structure for AB
3
is
A
B
B
B
A molecule exhibits resonance if more than
one Lewis structure can be drawn.
In this
case the double bond could be between the
central atom and any of the B atoms.
004
10.0 points
Carbon has a valence of four in nearly all of
its compounds and can form chains and rings
of C atoms. Consider the propyne structure.
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romasko (qrr58) – Homework 5 – sutcliffe – (50985)
2
C
C
H
H
H
C
H
←
a
←
b
←
c
What hybridizations would you expect for
the carbon atoms identified by a, b, and c,
respectively?
1.
sp
3
, sp, sp
3
2.
sp
3
, sp
2
, sp
3
3.
sp
3
, sp
3
, sp
2
4.
sp
2
, sp, sp
2
5.
sp
2
, sp, sp
6.
sp
2
, sp
2
, sp
3
7.
sp
3
, sp, sp
correct
Explanation:
C
C
H
H
H
C
H
←
sp
3
←
sp
←
sp
005 (part 1 of 3) 10.0 points
Consider the Lewis structures for H
2
CCH
2
,
H
2
C
C
CH
2
,
and
H
2
C
C
CCH
2
.
What
hy
bridization should be expected for the CH
2
carbon and the middle CCC carbon, respec
tively?
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 Fall '07
 Fakhreddine/Lyon
 Chemistry, Atom, Chemical bond, sp2

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