Organic Chemistry Some Basic Principles and Techniques Test

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Organic Chemistry Some Basic Principles and Techniques Test - 55

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Weekly Quiz Competition

Question 1
1 / -0

What is the prefix if the number of carbon atoms is $$3$$?

A
Eth-

B
Prop-

C
But-

D
Pent-

Solution
Question 2
1 / -0

Reaction mechanism describes:

A
sequential account of each step describing the details of electron movement

B
energy changes during bond breaking and bond formation

C
kinetics of the reaction

D
all of the above

Solution

A reaction mechanism is a step by step sequence of elementary reactions by which overall chemical change occurs.
A chemical mechanism describes in detail exactly what takes place at each stage of an overall chemical reaction (transformation).
So, option $$D$$ is the correct answer.
Question 3
1 / -0

Observe the following pairs of organic compounds :
(I) $$C_4H_9OH$$ and $$C_5H_{11}OH$$
(II) $$C_7H_{15}OH$$ and $$C_5H_{11}OH$$
(III) $$C_6H_{13}OH$$ and $$C_3H_7OH$$
Which of these pair is a homologous series according to increasing order of carbon atom ?

A
(III) only

B
(II) only

C
(I) only

D
All of these

Solution
Question 4
1 / -0

The functional group present in the following compound is:
$$CH_{3} CO CH_{2} CH_{2} CH_{2} CH_{3}$$

A
ketone

B
carboxylic acid

C
alcohol

D
carbonate

Solution

The functional group present in $$CH_{3}-CO-CH_{2}-CH_{2}-CH_{2}-CH_{3}$$ is the ketone group $$-CO$$.
Question 5
1 / -0

An organic compound $$X$$ give following laboratory tests.
(i) It gives white precipitate with tollen's reagent
(ii) it gives +ve iodoform test
(iii) It gives lucas test within 5 min
$$X$$ can be:

A
$$H-C\equiv C-(CH_2)_n - \underset{OH}{\underset{|}{C}H}-CH_2-CH_3$$

B
$$CH_3-C\equiv C - (CH_2)n-\underset{OH}{\underset{|}{C}H}-CH_3$$

C
$$H-C\equiv C-(CH_2)n-\underset{OH}{\underset{|}{C}H}-CH_3$$

D
none of the above

Solution

An organic compound $$X$$ give following laboratory tests.
(i) It gives a white precipitate with Tollen's reagent
(ii) It gives +ve iodoform test
(iii) It gives Lucas test within 5 min
$$X$$ can be the compound shown by the option $$C$$.
(i) It indicates the presence of an aldehyde group or presence of $$\displaystyle C \equiv C$$(ii) It indicates the presence of methyl keto group or a compound that can be easily oxidized to methyl keto group.
(iii) It indicates a presence of secondary alcohol.
Question 6
1 / -0

The nodal plane in the $$\pi$$ bond of ethene is located in:

A
the molecular plane.

B
a plane parallel to the molecular plane.

C
a plane perpendicular to the molecular plane, which bisects the carbon-carbon sigma bond at right angle.

D
a plane perpendicular to the molecular plane, which contains the carbon - carbon s-bond.

Solution

The molecular plane does not contain $$\pi$$ electron density. Hence, the nodal plane in $$\pi$$ bond is located in the molecular plane. $$\pi$$ electrons are present in a plane perpendicular to the molecular plane. The plane shown in diagram is the nodal plane in ethene.
Question 7
1 / -0

Which statement about a homologous series is incorrect?

A
All the members of the series have similar chemical reactions.

B
All the members of the series have the same functional group.

C
All the members of the series have the same general formula.

D
All the members of the series have similar physical properties

Solution
Question 8
1 / -0

Why is functional group important?

A
Because it is the portion of the organic molecule capable of characteristic reactions

B
Because it is how compounds are named

C
Because it is how you classify molecules

D
Because it contains carbon on which all life is formed

E
Because it is the portion of the organic molecule that does not undergo any reaction

Solution

(A):
Functional group important because it is the portion of the organic molecule capable of characteristic reactions.
For example:
$$ R-OH + SOCl_2 \rightarrow R-Cl + SO_2 + HCl$$
Here, the the $$-OH$$ group is active for the reaction which is substituted by the $$Cl$$ group in this reaction.
Question 9
1 / -0

Compound '$$A$$' on treatment with copper at $$300^\circ$$C gives '$$B$$' and a gas '$$C$$'. It is possible to get back '$$ A$$' from $$B$$ and $$C$$. In presence of '$$D$$', both $$B$$ and $$A$$ on treatment with certain reagent gives same compound '$$E$$', which on treatment with '$$A$$' gives compound $$F$$ with a fruity smell. Identify the compounds and isomer of 'F'.

A
$${CH}_{3}OH$$

B
$$HCOOH$$

C
$${CH}_{3}COOH$$

D
$$HCHO$$
Question 10
1 / -0

Which of the following group is sharp ortho and para directive?

A
$$-C_6H_5$$

B
$$-OH$$

C
$$-CH_3$$

D
$$-Cl$$

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Re-Attempt Weekly Quiz Competition

Organic Chemistry Some Basic Principles and Techniques Test - 55

Result

Organic Chemistry Some Basic Principles and Techniques Test - 55

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Rank

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SHARING IS CARING

Question 1

Eth-

Prop-

But-

Pent-

Solution

Question 2

sequential account of each step describing the details of electron movement

energy changes during bond breaking and bond formation

kinetics of the reaction

all of the above

Solution

Question 3

(III) only

(II) only

(I) only

All of these

Solution

Question 4

ketone

carboxylic acid

alcohol

carbonate

Solution

Question 5

$$H-C\equiv C-(CH_2)_n - \underset{OH}{\underset{|}{C}H}-CH_2-CH_3$$

$$CH_3-C\equiv C - (CH_2)n-\underset{OH}{\underset{|}{C}H}-CH_3$$

$$H-C\equiv C-(CH_2)n-\underset{OH}{\underset{|}{C}H}-CH_3$$

none of the above

Solution

Question 6

the molecular plane.

a plane parallel to the molecular plane.

a plane perpendicular to the molecular plane, which bisects the carbon-carbon sigma bond at right angle.

a plane perpendicular to the molecular plane, which contains the carbon - carbon s-bond.

Solution

Question 7

All the members of the series have similar chemical reactions.

All the members of the series have the same functional group.

All the members of the series have the same general formula.

All the members of the series have similar physical properties

Solution

Question 8

Because it is the portion of the organic molecule capable of characteristic reactions

Because it is how compounds are named

Because it is how you classify molecules

Because it contains carbon on which all life is formed

Because it is the portion of the organic molecule that does not undergo any reaction

Solution

Question 9

$${CH}_{3}OH$$

$$HCOOH$$

$${CH}_{3}COOH$$

$$HCHO$$

Question 10

$$-C_6H_5$$

$$-OH$$

$$-CH_3$$

$$-Cl$$

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