Nomenclature Test

Result

Nomenclature Test - 2

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Weekly Quiz Competition

Question 1
4 / -1

The IUPAC name of the following compound is

A
1,2-dimethylcyclobut-1-ene

B
2,3-dimethylcyclobut-1-ene

C
1,2-dimethylcyclobut-2-ene

D
1,4-dimethylcyclobut-1-ene

Solution

In counting of ring of carbon atoms, the lowest possible number is assigned to the carbon atom of multiple bond.
Question 2
4 / -1

Assign the IUPAC name of the following compound.

A
2-hydroxypentan-1,5-dioc acid

B
2-carboxy-2-hydroxypentan-1,5-dioic acid

C
2-hydroxypropane-1,2,3-tricarboxylic acid

D
3-hydroxypentane-1,2,3-trioic acid

Solution

The unbranched chain is linked directly with more than two (i.e., three) carboxy groups. Hence, the suffix tricarboxylic acid is added to the parent hydride, propane.
Question 3
4 / -1

Assign the IUPAC name for the following compound.

A
3-(carboxymethyl) heptanedioic acid

B
pentane-1,2,5-tricarboxylic acid

C
5,5-bis (carboxymethyl) pentanedioic acid

D
none of the above

Solution

When all the carboxylic acid groups cannot be described in the suffix, a carboxylic acid group is indicated by the prefix ‘carboxy’. Here – CH₂COOH group is designated as carboxymethyl group.
Question 4
4 / -1

Write the IUPAC of the following compound.

A
2,4-dioxocyclohexanoic acid

B
2,4-dioxocycloheptanoic acid

C
4-formyl-2-oxocyclohexane-1-carboxyclic acid

D
2,4-dioxocyclohexane-1-carboxylic acid

Solution

Since – CHO is not in the chains, so it is designated as formyl group. > C == C O group is treated as prefix ‘OXO’. The–COOH group is described in the suffix as carboxylic acid. Thus, the name is derived from the name of corresponding carboxylic acid.
Question 5
4 / -1

Assign IUPAC name for the following compound.

A
3,7-dimethylhepta-2,6-dien-1-al

B
3,7-dimethylocta-2,6-dien-1-al

C
2,6-dimethylocta-2,6-dien-1-al

D
3,7-dimethyllocta-2,6-dien-1-al

Solution
Question 6
4 / -1

Assign the IUPAC name for the following compound.

A
4-methyl-1-ethylcyclohexane

B
1-ethyl-4-mnethylcyclohexane

C
3-ethyl-6-methylcyclohexane

D
6-methyl-3-ethylcyclohexane

Solution

Simple prefixes (or unsubstituted substituents) are arranged alphabetically, multiplying locants if necessary and these are then inserted without altering alphabetical order already established.
Question 7
4 / -1

What is the IUPAC name in the compound?

A
7-(1,2-difluorobutyl)-9-ethyltridecane

B
9-ethyl-7-(1,2-difluorobutyl) tridecane

C
5-ethyl-7-(1,2-difluorobutyl) tridecane

D
7-(1,2-difluorobutyl)-5-ethyltridecane

Solution

The name of a prefix for a substituted substitutent is considered to begin with the first letter of its complete name. Hence, difluorobutyl is alphabetized before ethyl.
Question 8
4 / -1

Assign the IUPAC name for the following compound.

A
4,5-dichloro-2-[4-chloro-2-(hydroxymethyl)-5-oxohexyl] cyclohexane -1-carboxylic acid

B
3,4-dichloro-6-[4-chloro-2-(hydroxymethyl)-5-oxohexyl] cyclohexane-1- carboxylic acid

C
4,5-dichloro-2-[4-acetyl-4-chloro-2-(hydroxymethyl) butyl] cyclohexane-1- carboxylic acid

D
2-[4-acetyl-4-chloro-2-(hydroxymethyl) butyl-4, 5-dichlorocyclohexane-1-carboxylic acid

Solution

Cyclohexane is chosen as parent hydride, because it bears the principal functional group –COOH. Parent substituent is hexyl and secondary substitutuent is hydroxy-methyl. It is important to note that the name of substituted substituend starts from its first letter i.e., dichloro.
Question 9
4 / -1

Write the IUPAC name of the following compound.

A
3-(oxomethyl) hexanedial

B
. 3-methyl hexanetrial

C
3-(methylformyl) hexanedial

D
3-(formylmethyl) hexanedial

Solution

An aldehyde group is described by the prefix formyl, if we cannot consider it in the chain of carbon atoms. The substituted substitutuent–CH₂CHO is described as formylmethyl.
Question 10
4 / -1

The IUPAC name of DDT,

A
2,2-bis (p-chlorophenyl)-1,1,1-trichloroethane

B
dichlorodiphenyltrichloroethane

C
1,1,1-trichloro-2,2-bis (p-chlorophenyl) ethane

D
1,1bis (p-chlorophenyl) 2,2,2-trichloroethane

Solution

The name of a substituted substitutuent begins with the first letter of its name. Chlorophenyl should be alphabetized after chloro group. Hence, the name is 1,1,1-trichloro-2,2- bis (p-chlorophenyl) ethane.