Ochem- Homework 1 (multiple choice) Flashcards


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1

In the case of a covalent non-polar bond, the difference in electronegativity between two bonded atoms is ___.

0.0-0.5

2

In the case of a covalent, polar bond, the difference in electronegativity between two bonded atoms is ___.

0.5-1.67

3

If the electronegativity difference between two bonded atoms is higher than ___, the bond is called an ionic bond.

1.67

4

The higher the electronegativity difference between two bonded atoms, the more ___ is the covalent bond.

Polar

5

The state of hybridization of carbon in methane is ___ whereas it is ___ in ethylene.

- sp3 (methane)

- sp2 (ethylene)

6

Carbon is ___ hybridized in ethane whereas ___ in acetylene.

- sp3 (ethane)

- sp (acetylene)

7

How many sigma bond and pi bond are present in the ethylene (C2H4) molecule?

- 5 sigma

- 1 pi

8

How many sigma bond and pi bond are present in the acetylene (C2H2) molecule?

- 3 sigma

- 2 pi

9

In benzene, the carbons are ___ hybridized.

sp2

10

As the number of nearly equivalent resonance contributors ___, the resonance energy ___.

- increases

- increases

11

CH3-CH2-CH2-CH3

The compound is the structure of ___.

Butane

12

Write the structure of n-hexane and Cyclohexane.

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13

Write the structure of Hex-3-yne.

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14

tButyl iodide is a ___ alkyl halide.

tertiary

15

Isopropyl fluoride is a ___ alkyl halide.

secondary

16

Ethyl bromide is a ___ alkyl halide.

primary

17

The IUPAC name of methyl chloride is ___.

chloromethane

18

The IUPAC name of Cyclobutyl bromide is ___.

bromocyclobutane

19

The IUPAC name of Cyclohexyl fluoride is ___.

fluorocyclohexane

20

Write the structure of Iodobenzene.

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21

Glycerol is an example of ___ alcohol.

trihydric

22

Phenol is also known as ___ acid.

carbolic

23

Neopentyl acohol

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24

Cyclobutanol

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25

Write the name and structure of two symmetrical and non-symmetrical ethers.

- Symmetrical: dimethyl ether (metoxymethane) and diethyl ether (etoxyethane)

- Nonsymmetrical: ethyl-methyl ether (methoxyethane) and methyl-phenyl ether (methoxybenzene)

26

The common name of Methoxymethane is

Dimethyl ether

27

The IUPAC name of anisole is ___.

methoxybenzene

28

Write the structure of TBME (methyl tert-butyl ether).

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29

Triethylamine is widely used as an organic ___ in the laboratory.

base

30

Aniline

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31

p-Anisidine

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32

Pyrrole

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33

Pyridine

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34

Quinoline

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35

Imidazole

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36

Indole

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37

Pyrimidine

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38

Write the structures of two aliphatic cyclic amines.

Pyridine and quinoline

39

In carbonyl compounds, the carbonyl carbon is ___ hybridized.

sp2

40

Hexanol

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41

Hexanal

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42

Write the structure of y-hydroxyvaleraldehyde.

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43

The carbonyl carbon in acetic acid is ___ hybridized.

sp2

44

The carbonyl carbon in acetic acid contains ___% s-character, whereas the carbon in methanol contains ___% s-character.

- 33% (acetic acid)

- 25% (methanol)

45

The common name of ethanoic acid is ___.

acetic acid

46

2-bromobutanoic acid

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47

Valeric acid

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48

The reverse reaction of esterification is known as ester ___.

hydrolysis

49

Write the name of an ester that is widely used as a solvent in organic chemistry.

Tetrahydrofuran

50

Ortho, meta, para-xylene

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51

Beta-lactam is a four-membered ___ amide, whereas ___ lactam is ___ membered cyclic ___.

- cylic

- gamma y

- five

- amide

52

The general formula of alkanes is ___.

CnH2n+2

53
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The name of the following compound is

Pyrene

54

To achieve noble gas configuration, hydrogen requires ___ whereas chlorine requires ___ in the outermost shell.

- duet

- octet

55

The ___ the number of relatively stable resonance contributors, the ___ the resonance energy.

- higher

- higher

56

The other name of Methylbenzene is ___.

Toluene

57

In pericondensed polyaromatic hydrocarbon, one or more carbon atoms must be a common number of ___ benzene rings.

three

58

H2NCH2CH2CH2CO2H

The name of the compound is ___.

4-aminobutanoic acid

59

Benzoyl chloride is an example of

aromatic acid chloride

60

Acetyl chloride is an example of

aliphatic acid chloride

61

Acetic anhydride is an example of

aliphatic acid anhydride

62

Phtalic anhydride is an example of

heterocyclic acid anhydride

63

Formamide is an example of

aliphatic amide

64

Benzamide is an example of

aromatic amide