Nomenclature Test

Result

Nomenclature Test - 1

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Weekly Quiz Competition

Question 1
4 / -1

The IUPAC name of the saturated compound having the following carbon skeleton is

A
4-ethyl-2isopropyl-3-methylheptane

B
5-ethyl-2,3,4-trimethyloctane

C
4,5,6-trimethyl-3-propylheptane

D
2,3,4-trimethyl-4-propylheptane

Solution

The longest chain of carbon atoms consists of eight carbons. Hence, the parent hydride is octane.
Question 2
4 / -1

The compound with an isopropyl group is

A
2,2,3,3-tetramethylpentane

B
2,2-dimethyl pentane

C
2,2,3-trimethyl pentane

D
2-methylpentane

Solution

The compound (d) has methyl group attached to the second carbon atom of the parent hydride, pentane. Hence, it contains isopropyl group,
Question 3
4 / -1

Indicate the wrongly named compound.

A

B

C

D

Solution

The principal functional group is , the carbon atom of this group must be assigned the lowest possible number, i.e., ‘2’. Hence, the correct name is hex-3-en-2- one.
Question 4
4 / -1

The IUPAC name of this compound

A
pent-1-en-4-yne

B
. pent-4-en-1-yne

C
pent-4-yn-1-ene

D
pent-1-yn-4-ene

Solution

The = and ≡ bonds are at equal distances from the ends. Now = bond is given preference to ≡ bond in counting the chain of carbons. Thus, primary suffix is taken as ‘ene’. The suffix ‘yne’ is used as secondary suffix.
Question 5
4 / -1

Which of the following IUPAC names is correct?

A
2-methyl-3-ethylpentane

B
2-ethyl-3-methylpentane

C
3-ethyl-2-methylpentane

D
3-methyl-2-ethylpentane

Solution

Side chain must be prefixed in alphabetical order.
Question 6
4 / -1

The IUPAC name of compound

A
1,1-dimethyl-2-propene

B
3-methyl-1-butene

C
2-vinyl propane

D
1-isopropylethylene

Solution

With double bond at position 1.
Question 7
4 / -1

The IUPAC name of is

A
4-methyl-2-pentyne

B
4,4-dimethyl-2-butyne

C
methyl isopropyl acetylene

D
2-methyl-4-pentyne

Solution

With lowest number to triple bond position.
Question 8
4 / -1

The IUPAC name of the compound

is

A
oct-3-en-6-yne

B
oct-5-en-2-yne

C
oct-2-yn-5-en

D
1-ethylhex-1-en-4-yne

Solution

Here double and triple bonds are not at equal distances from the end, therefore, numbering of chain of carbon atoms is done from that end which is nearer to the double or triple bond. “ene” is always used as a primary suffix in preference to ‘yne’.
Question 9
4 / -1

The IUPAC name of the following compound is

A
5,6-diethyl-3-methyldec-4-ene

B
5-6-diethyl-8-methyldec-6-ene

C
5,6-dimethyl-8-methyldec-6-ene

D
5-6-dimethyl-3-methyl-4-ene

Solution

In bond line notations, bonds are represented by lines and line ends and line intersections denote carbon atoms. The structure of the compound is:
Question 10
4 / -1

The IUPAC name of the compound following compound is

A
butyl cyclopropane

B
1-cyclopropyl butane

C
. 2-cyclopropyl butane

D
3-cyclopropyl butane

Solution

The ring is designated as a substituent, if the alkane chain contains greater number of carbon atoms than the ring. If alkane chain has lesser number of carbons, then the alkane chain would be treated as substituent.