Question 1

What is the empirical formula of butane?

  A  

C4H10

  B  

C2H5

  C  

CH2.5

  D  

CnH2n+2

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Question 2

The type of formula that shows all the bonds and all the atoms in a molecule is

  A  

an empirical formula

  B  

a molecular formula

  C  

a structural formula

  D  

a displayed formula

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Question 3

What is the correct name for the compound shown?

  A  

1,2,2-trimethylbutan-3-ol

  B  

2-ethyl-2-methylbutan-2-ol

  C  

3,3-dimethylpentan-2-ol

  D  

4-hydroxy-3,3-dimethylpentane

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Question 4

Nucleophiles are

  A  

electron pair donors that attack regions of high electron density

  B  

electron pair donors that attack regions of low electron density

  C  

electron pair acceptors that attack regions of high electron density

  D  

electron pair acceptors that attack regions of low electron density

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Question 5

Isomers have different

  A  

empirical formulae

  B  

molecular formulae

  C  

skeletal formulae

  D  

molar masses

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Question 6

Electrophiles are

  A  

electron pair donors that are attracted to regions of high electron density

  B  

electron pair donors that are attracted to regions of low electron density

  C  

electron pair acceptors that are attracted to regions of high electron density

  D  

electron pair acceptors that are attracted to regions of low electron density

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Question 7

How many unsaturated structural isomers are there with the formula C5H10?

  A  

3

  B  

5

  C  

6

  D  

9

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Question 8

What is the systematic name of the compound below?

  A  

E-2-bromobut-2-ene

  B  

Z-2-bromobut-2-ene

  C  

E-1,2-dimethyl-1-bromoethene

  D  

Z-1,2-dimethyl-1-bromoethene

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Question 9

The skeletal formula of an organic compound is shown below.

What is the molecular formula of the organic compound?

  A  

C6H10O2


  B  

C6H11O2


  C  

C6H12O2


  D  

C6H13O2


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Question 10

How many structural isomers have the molecular formula C5H12?

  A  

2

  B  

3

  C  

4

  D  

5

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Question 11

An organic compound has the composition by mass:

     C, 53.33 %; H, 11.11%; O, 35.56%.

What is the empirical formula of the organic compound?

  A  

C4H8O2


  B  

C4H10O2


  C  

C2H4O


  D  

C2H5O


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Question 12

Which statement about bonds is correct?

  A  

the C=C bond in ethene is more polar than the C−C bond in ethane

  B  

a σ-bond is stronger than a π-bond

  C  

the H-C-H bond angle in ethane is greater than the H-C-H bond angle in ethene

  D  

a σ-bond is formed from sideways overlap of p orbitals

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Question 13

The structure of a stereoisomer is shown below.

Which term correctly describes this stereoisomer?

  A  

cis-

  B  

trans-

  C  

E-

  D  

Z-

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Question 14

The structure of cyclohexene is shown.

Which of the following is the general formula of cyclic alkenes such as cyclohexene?

  A  

CnH2n-4

  B  

CnH2n-2

  C  

CnH2n

  D  

CnH2n+2

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Question 15

What is the IUPAC name for this compound?

  A  

2-dimethyl-3-fluoropentane

  B  

2,2-dimethyl-3-fluoropentane

  C  

3-fluoro-2,2-dimethylpentane

  D  

3-fluoro-2-dimethylpentane

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Question 16

Which has E-Z isomers?

  A  

C2H2Br2

  B  

C2H3Br

  C  

C2H4Br2

  D  

C2H5Br

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Question 17

Which compound is not an isomer of the following compound?

  A  

CH3CH2COCH3

  B  

CH3CH=CHCH2OH

  C  

(CH3)2CHCHO

  D  

CH2=CHCH2CHO

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Question 18

How many structural isomers with an unbranched carbon chain have the molecular formula C4H8Br2?

  A  

4

  B  

5

  C  

6

  D  

7

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