Organic Chemistry Some Basic Principles and Techniques Test

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Organic Chemistry Some Basic Principles and Techniques Test - 34

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Weekly Quiz Competition

Question 1
1 / -0

Which is the most aromatic in character?

A

B

C

D
All having same aromatic character

Solution
Question 2
1 / -0

Product on monobromination of this compound is:

A

B

C

D

Solution

Bromination of benzene group attaches to ortho or para when electron donating groups are present.
$$-NH$$ is an electron donating group.
So, the compund in the image is the product.
$$Br$$ is in the para position.
Question 3
1 / -0

The products $$A$$ and $$B$$ respectively, are:

A

B

C
both $$A$$ and $$B$$

D
none of the above

Solution

Mechanism: The cation formed at phenyl group because it is stabilised by resonance.
Question 4
1 / -0

What is IUPAC name for isophthalic acid?

A
Benzene- 1,3 dicarboxylic acid

B
Benzene- 1,2 dicarboxylic acid

C
Benzene- 1,4 dicarboxylic acid

D
Benzene- 1,5 dicarboxylic acid

Solution

IUPAC name is benzene$$-1,3-$$dicarboxylic acid.
Question 5
1 / -0

The IUPAC name of the compound :

A
3,3-dimethyl-1-hydroxy cyclohexane

B
1, 1-dimethyl-3-hydroxy cyclohexane

C
3,3-dimethyl-1 -cyclohexane

D
1,1-dimethyl 1-3-cyclohexane

Solution

$$3,3 \text { -dimethyl-1-hydroxy cyclohexane }$$
Question 6
1 / -0

Which of the following compound gives only one monochloro product on its chlorirnation in presence of sunlight?

A
n-butane

B
Iso pentane

C
Neo pentane

D
n-pentane

Solution

Reason:- All the hydrogen of neo-pentane are primary that's why it gives only one mono chloro product.
Question 7
1 / -0

Correct IUPAC name of l-chloropent-l-yn-4-ol.

A
Chloropentyne-2-ol

B
5-Chloropent-4-yn-2-ol

C
2-Hydroxypent-4-yn-2-ol

D
4-Hydroxypent-l-yne

Solution

$$\Rightarrow$$ Alcohol is given $${ 1 }^{ st }$$ prefence.
$$\Rightarrow$$ $$S-$$chloropent$$-1-yn-4-01$$.
Ans :- B
Question 8
1 / -0

Which of the following is the correct IUPAC name for the following compound?

A
2-(1,1-dimethyl ethyl)-5-(1-methyl ethyl) heptane

B
2-(1,2-dimethyl ethyl)-5-ethyl-6-methyl heptane

C
3-ethyl-2,6,7,7-tetramethyl octane

D
6-ethyl-2,2,3,7-tetramethyl octane

Solution

Rules for Naming Hydrocarbons:-

Rule-I Selection of the longest carbon chain.

Rule-II Numbering the longest chain: Longest chain is numbered starting from a terminal carbon. Numbering is done is such a way that lowest possible number is given to the side cahin or a functional group.

Rule-III Writing names of branched, saturated hydrocarbons, locants are written first in alphabetical order followed by name of parent chain.

Rule-IV Some common names are retained in $$IUPAC$$ system for unsubstituted hydrocarbon only.

Option (D) 6-ethyl-2,2,3,7-tetramethyl octane is the answer.
(Refer to Image)
For $$8$$-carbon atom $$\longrightarrow$$ Octane.
For $$-CH_3$$ group $$\longrightarrow$$ Methyl.
Question 9
1 / -0

The IUPAC name of the product obtained by the oxidation of phenol with the help of chromic acid is__________.

A
cyclo-hexa-2,4-diene-1,4-diol

B
cyclo-hexa-2,4-diene-1,4-dione

C
cyclo-hexa-2,5-diene-1,4-diol

D
cyclo-hexa-2,5-diene-1,4-dione

Solution

(Refer to Image)
$$cyclo-hexa-2,5-diene-1,4-dione$$
Question 10
1 / -0

Which of the following is product $$"A'$$ in the above reaction?

A

B

C

D

Solution