Organic Chemistry Some Basic Principles and Techniques Test

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Organic Chemistry Some Basic Principles and Techniques Test - 31

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Weekly Quiz Competition

Question 1
1 / -0

Identify the correct decreasing order of priority of the functional groups from the following:

A
$$-CONH_2, -C=O, -HC=O, -CN$$

B
$$-CONH_2, -CN, -HC=O, -C=O$$

C
$$-CN, -CONH_2, -C=O, -HC=O$$

D
$$-CN, -CONH_2, -HC=O, -C=O$$

Solution

$$Amides \ > \ Nitriles \ > \ Aldehydes \ > \ ketones$$
Option B is correct.
Question 2
1 / -0

The formula of methane is $$CH_4$$ and its succeeding member ethane is expressed in $$C_2 H_6$$. The common difference of succession between them is:

A
$$CH_2$$

B
$$C_2H_2$$

C
$$CH_4$$

D
None of the above

Solution

Methane and ethane are alkanes. These are saturated carbon compounds. They have the general formula $$C_nH_{2n+2}$$. All the alkanes differ by $$CH_2$$ group successively in the series.
Question 3
1 / -0

The IUPAC name of compound $$CH_2 = CH -CH(CH_{3})_2$$ is:

A
1, 1-dimethyl-2-propane

B
2-vinyl propene

C
3-methyl-1-butene

D
2-vinyl propane

Solution

The IUPAC name of $$\displaystyle CH_2 = CHCH (CH_{3})_2$$ is $$\displaystyle 3-methyl-1-butene$$. The numbering is started from the end which gives the lowest locants to doubly bonded C atoms.
Hence, the option (C) is the correct answer.
Question 4
1 / -0

Identify the functional group present in acetic acid:

A
$$O-\underset{O}{\underset{||}{C}}-OH$$

B
$$O-\overset{C}{\overset{||}{\underset{O}{\underset{||}{C}}}}-OH$$

C
$$-\underset{O}{\underset{||}{C}}-OH$$

D
$$H-\overset{H}{\overset{|}{\underset{H}{\underset{|}{C}}}}=OH$$

Solution

The functional group present in acetic acid is carboxylic group $$\displaystyle -\underset{ \displaystyle O}{\underset{||}{C}}-OH$$.

Acetic acid can be represented as $$\displaystyle CH_3-\underset{ \displaystyle O}{\underset{||}{C}}-OH$$

Hence, the correct option is $$C$$
Question 5
1 / -0

The functional group present in a molecule having the formula $${C}_{12}{O}_{9}$$ is

A
Carboxylic acid

B
Anhydride

C
Aldehyde

D
Alcohol

Solution

the given compound is example of cyclic trianhydride side. The structure is as shown in image

Answer is (B).
Question 6
1 / -0

The atom or the group of atoms by which the characteristic reactions of organic compounds are determined, that atom or group of atoms is called ____________.

A
hydrocarbon

B
functional group

C
atom

D
compound

Solution

Functional groups are specific substituents or moieties within molecules that are responsible for the characteristic chemical reactions of those molecules.
Examples: $$-OH,-COOH,-COOR$$ etc.
Hence, the atom or the group of atoms by which the characteristic reactions of organic compounds are determined, that atom or group of atoms is called functional group.
Question 7
1 / -0

Which substance has the lowest boiling point?

A
$$CH_3 CH_2 CH_2 CH_2 OCH_3$$

B
$$CH_3 CH_2 OCH_2 CH_3$$

C
$$CH_3 CH_2 CH_2 CH_3$$

D
$$CH_3 CH_2 C = OCH_3$$

Solution

$$\displaystyle CH_3 CH_2 CH_2 CH_3$$ $$\displaystyle (n-butane) $$ has the lowest boiling point as it has lowest molecular weight and is non polar. It has weakest intramolecular forces of attraction.
All others are polar comp[ounds and so has dipole-dipole inbteraction.

Hence, the correct option is $$C$$
Question 8
1 / -0

An organic compound is a clear liquid having a molecular formula $${C}_{4}{H}_{8}O$$. It has an open-chain structure. Without any carbon-carbon double bond. The compound can be:

a) An alcohol
b) An ester
c) An aldehyde
d) A ketone

A
(a) and (b)

B
(c) and (d)

C
(b) and (d)

D
(d) and (a)

Solution

An organic compound is a clear liquid having a molecular formula C$$_4$$H$$_8$$O. It has an open chain structure. Without any carbon-carbon double bond. The compound can be either an aldehyde or a ketone.
Question 9
1 / -0

How many delocalised $$\pi$$- electrons are there in the following compound?

A
1

B
2

C
4

D
6

Solution

In the given compound. 4 $$\pi$$-electrons of double bond and 1 lone pair on $$N-$$atom leads to delocalization of $$\pi$$-electrons.
Question 10
1 / -0

$$O=C=O$$
How many pi bonds does given compound have?

A
2

B
3

C
4

D
5

Solution

Each double bond contains one sigma and one pi bond. There are two double bonds. Thus, there are 2 pi bonds.

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Organic Chemistry Some Basic Principles and Techniques Test - 31

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Organic Chemistry Some Basic Principles and Techniques Test - 31

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Question 1

$$-CONH_2, -C=O, -HC=O, -CN$$

$$-CONH_2, -CN, -HC=O, -C=O$$

$$-CN, -CONH_2, -C=O, -HC=O$$

$$-CN, -CONH_2, -HC=O, -C=O$$

Solution

Question 2

$$CH_2$$

$$C_2H_2$$

$$CH_4$$

None of the above

Solution

Question 3

1, 1-dimethyl-2-propane

2-vinyl propene

3-methyl-1-butene

2-vinyl propane

Solution

Question 4

$$O-\underset{O}{\underset{||}{C}}-OH$$

$$O-\overset{C}{\overset{||}{\underset{O}{\underset{||}{C}}}}-OH$$

$$-\underset{O}{\underset{||}{C}}-OH$$

$$H-\overset{H}{\overset{|}{\underset{H}{\underset{|}{C}}}}=OH$$

Solution

Question 5

Carboxylic acid

Anhydride

Aldehyde

Alcohol

Solution

Question 6

hydrocarbon

functional group

atom

compound

Solution

Question 7

$$CH_3 CH_2 CH_2 CH_2 OCH_3$$

$$CH_3 CH_2 OCH_2 CH_3$$

$$CH_3 CH_2 CH_2 CH_3$$

$$CH_3 CH_2 C = OCH_3$$

Solution

Question 8

(a) and (b)

(c) and (d)

(b) and (d)

(d) and (a)

Solution

Question 9

1

2

4

6

Solution

Question 10

2

3

4

5

Solution

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