Organic Chemistry Some Basic Principles and Techniques Test

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Organic Chemistry Some Basic Principles and Techniques Test - 27

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Weekly Quiz Competition

Question 1
1 / -0

The trends in physical properties of compounds within a homologous series are due to:

A
change in size

B
change in weight

C
functional group

D
both A and B

Solution

The trends in physical properties of compounds within a homologous series are primarily due to the progression of sizes and therefore, weights of the molecules that form the homologous series.
Question 2
1 / -0

The most common characteristics of homologous series is increase in the number of:

A
propyl units

B
methyl units

C
methylene units

D
butyl units

Solution

The most common characteristic of homologous series is increase in the number of methylene $$(-CH_{2}-)$$ units in saturated chain within the molecule.
Question 3
1 / -0

Carbon and hydrogen in an organic compound are detected as ______.

A
$$CaHCO_3, CuSO_4\cdot 5H_2O$$

B
$$CaCO_3, CuSO_4\cdot 5H_2O$$

C
$$CaCO_3, Cu(OH)_2$$

D
$$CaHCO_3, CaCO_3$$

Solution

Carbon and hydrogen in an organic compound are detected as
$$\displaystyle CaCO_3, CuSO_4\cdot 5H_2O$$
The organic compound is heated with dry copper oxide when C and H of the organic compound are oxidized to carbon dioxide and water.
Carbon dioxide is detected by passing it through lime to form calcium carbonate and the presence of hydrogen is detected by passing it through anhydrous copper sulphate (white) which turns blue (hydrated copper sulphate).
Question 4
1 / -0

Which of the following is a characteristic of homologous series?

A
All the members can be represented by same general formula

B
All the members have same functional group

C
Both a and b

D
All the members show different chemical properties

Solution

All the members can be represented by same general formula. The molecular formulae of two successive members differ by $$C{H}_{2}$$ group or by $$14 u$$. All the members have same functional group. All the members show similar chemical properties.
Question 5
1 / -0

Which functional group is present in a molecule of $${CH}_{3}Cl$$?

A
Amine

B
Halide

C
Ether

D
Aldehyde

E
Ketone

Solution

Methyl chloride, $$\displaystyle CH_3Cl$$ is an alkyl chloride. The functional group present is chlorine atom $$\displaystyle -Cl$$.
Note: In general we can write alkyl halides as R-X where X is halogen atom (Cl, Br, I or F).
Question 6
1 / -0

Which term is the best match for the color of a chemical substance students make note of:

A
qualitative data

B
inference

C
observation

D
quantitative data

E
hypothesis

Solution

Color of the substance is the qualitative property. Qualitative properties are the properties which can be observed without making any measurements or calculations.
Question 7
1 / -0

Which of the following is the best evidence for the validity of a proposed reaction mechanism?

A
The same mass of catalyst is present at the end of the reaction as it was at the beginning.

B
An experimenter found spectrophotmetric data consistent with the presence of a reaction intermediate in the proposed mechanism.

C
Reaction rate data suggests that the rate of the reaction is approximately what is expected.

D
The product proposed by the mechanism was formed.

Solution

A proposed reaction mechanism is considered valid in many ways and one of the way being the reaction rate data suggests that the rate of reaction is approximately equal to what is expected.
Question 8
1 / -0

Which functional group is present in a molecule of $${CH}_{3}COOH$$?

A
Ether

B
Aldehyde

C
Carboxyl

D
Ester

E
Amine

Solution

Acetic acid $$\displaystyle {CH}_{3}COOH$$ is a carboxylic acid. The functional group present is carboxylic group $$\displaystyle -COOH$$
Note: In general, carboxylic acids can be represented as $$\displaystyle R-COOH$$
Question 9
1 / -0

Which one of the following can show +I effect?

A
$$CBr_3$$

B
$$CH_3$$

C
$$CCl_3$$

D
$$CHO$$

Solution

Only $$CH_3$$ shows +I effect rest of them shows -I effect, since other groups contain electronegative atom which will pull electrons towards it causing -I effect.
Question 10
1 / -0

Which functional group is present in a molecule of $${CH}_{3}OH$$?

A
Ketone

B
Aldehyde

C
Ester

D
Alcohol

E
Halide

Solution

The functional group present in the molecule of methanol $$\displaystyle CH_3OH$$ is hydroxyl group ($$\displaystyle -OH$$) group. Methanol is an alcohol. Hence, the functional group is alcoholic $$\displaystyle -OH$$ group.
Note: In general, we can represent alcohol as R-OH.

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Re-Attempt Weekly Quiz Competition

Organic Chemistry Some Basic Principles and Techniques Test - 27

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Organic Chemistry Some Basic Principles and Techniques Test - 27

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SHARING IS CARING

Question 1

change in size

change in weight

functional group

both A and B

Solution

Question 2

propyl units

methyl units

methylene units

butyl units

Solution

Question 3

$$CaHCO_3, CuSO_4\cdot 5H_2O$$

$$CaCO_3, CuSO_4\cdot 5H_2O$$

$$CaCO_3, Cu(OH)_2$$

$$CaHCO_3, CaCO_3$$

Solution

Question 4

All the members can be represented by same general formula

All the members have same functional group

Both a and b

All the members show different chemical properties

Solution

Question 5

Amine

Halide

Ether

Aldehyde

Ketone

Solution

Question 6

qualitative data

inference

observation

quantitative data

hypothesis

Solution

Question 7

The same mass of catalyst is present at the end of the reaction as it was at the beginning.

An experimenter found spectrophotmetric data consistent with the presence of a reaction intermediate in the proposed mechanism.

Reaction rate data suggests that the rate of the reaction is approximately what is expected.

The product proposed by the mechanism was formed.

Solution

Question 8

Ether

Aldehyde

Carboxyl

Ester

Amine

Solution

Question 9

$$CBr_3$$

$$CH_3$$

$$CCl_3$$

$$CHO$$

Solution

Question 10

Ketone

Aldehyde

Ester

Alcohol

Halide

Solution

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