Org Chem

Question 1

Which of the following structures represents a molecule different from the others?
A. I
B. IV
C. II
D. III

Answer 1

D. III

Question 2

Which is the correct molecular formula of the following molecule?
A. II
B. IV
C. I
D. III

Answer 2

A. II (C8H10)

Question 3

Which of the following compounds has an Ionic bond?
I. H2O
II. NH4Cl
III. CH3Cl
IV. CH3Li
A. II
B. IV
C. I
D. III

Answer 3

A. II

Question 4

How many hydrogen atoms are in one molecule of propene?
A. 4
B. 3
C. 6
D. 8

Answer 4

C. 6

Question 5

Which is the correct IUPAC name of the following compound?
A. 5-bromo-3-ethylhept-3-ene
B. 3-ethyl-5-bromohept-3-ene
C. 3-bromo-5-ethylhept-4-ene
D. Ill-diethyl-3-bromopent-1-ene

Answer 5

A. 5-bromo-3-ethylhept-3-ene

Question 6

In which species are all the carbon atoms considered to be sp2 hybridized?
l. C2H2
II. C2H4
Ill. C3H8
IV. C4H10
A. IV
B. Il
C. I
D. Ill

Answer 6

B. Il

Question 7

For which compound are the empirical and molecular formulas the same?
I C6H5COOH
II C6H4(COOH)2
III HOOCCOOH
IV CH3COOH
A. Ill
B. I
C. IV
D. II

Answer 7

B. I

Question 8

How many different compounds have the formula C5H12?
A. 5
B. 2
C. 4
D. 3

Answer 8

D. 3

Question 9

In which species Is the carbon-nitrogen bond the shortest?
I. CH3NH2
II. CH2NH
Ill. (CH3)4N+
IV. CH3CN
A. Il B. I C. IV D. Ill

Answer 9

C. IV

Question 10

What Is the hybridization of the carbon atom in a carboxyl group?
A. sp
B. sp3
C. sp2
D. dsp3

Answer 10

C. sp2

Question 11

Which compound is an aldehyde?
A. Il
B. III
C. IV
D. I

Answer 11

B. III (o at the end of double bond,)

Question 12

Which compound is NOT an ether?
A. IV
B. I
C. II
D. III

Answer 12

D. III ( middle o connected in double bond)

Question 13

Which compound is a tertiary amine?
A. II
B. III
C. I
D. IV

Answer 13

D. IV ( NCH3)

Question 14

Which of the following hydrocarbon has the lowest boiling point?
l. C4H10 ll. CH4 Ill. C6H6 IV. C2H6
A. IV
B. II
C. I
D. III

Answer 14

B. II

Question 15

Which compound Is a tertiary alcohol?
A. III
B. IV
C. II
D. I

Answer 15

D. I (CH3)3COH

Question 16

How many different alcohols have the molecular formula C4H10O?
A. 2
B. 4
C. 3
D. 5

Answer 16

B. 4

Question 17

Which compound Is expected to be most soluble in water at 25oC
I N2 (g)
II O2 (g)
Ill (C2H5)2NH (l)
IV C2H5OC2H5 (l)
A. III
B. IV
C. I
D. II

Answer 17

A. III

Question 18

Which compound Is expected to be most soluble in water at 25oC
I N2 (g)
II O2 (g)
Ill (C2H5)2NH (l)
IV C2H5OC2H5 (l)
A. III
B. IV
C. I
D. II

Answer 18

A. III

Question 19

he gentle oxidation of ethanol (CH3CH2OH) produces ______
I ethanal, CH3CHO
Il ethanoic acid, CH3CO2H
Ill carbon monoxide, CO
IV carbon dioxide, CO2
A. IV
B. I
C. II
D. III

Answer 19

B. I

Question 20

The following compounds have very similar molar masses. What would be the correct order when they
are arranged in order of increasing strength of their intermolecular forces.
l. C3H8 Il. CH3OCH3 III. CH3CH2OH
A. II < I < III
B. III < I < II
C. I < II < III
D. III < II < I

Answer 20

C. I < II < III

Question 21

The following compounds have very similar molar masses. What would be the correct order when they
are arranged in order of increasing strength of their intermolecular forces.
l. C3H8 Il. CH3OCH3 III. CH3CH2OH
A. II < I < III
B. III < I < II
C. I < II < III
D. III < II < I

Answer 21

C. I < II < III