Hydrocarbons Test

Result

Hydrocarbons Test - 41

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Weekly Quiz Competition

Question 1
1 / -0

The IUPAC name of

A
4-bromo-3-chloro-1-cyclohexen-5-yne

B
5-bromo-6-chloro-1-cyclohexen-3-yne

C
6-bromo-5-chloro-3-cyclohexen-3-yne

D
6-bromo-5-chloro-1-cyclohexen-3-yne

Solution

IUPAC name of this compound is
5-bromo-6-chloro-1-cyclohexen-3-yne
Question 2
1 / -0

The IUPAC name of the compound shown is:

A
2-bromo-6-chlorocyclohex-1-ene

B
6-bromo-2-chlorocyclohexene

C
3-bromo-1-chlorocyclohexene

D
1-bromo-3-chlorocyclohexene

Solution

The correct IUPAC name is
3-bromo-1-chlorocyclohexene
Question 3
1 / -0

The IUPAC name of the given compound is

A
bicyclo [2.2.0] octane

B
bicyclo [0,2,2] hexane

C
bicyclo [2,1,1] hexane

D
bicyclo [2,2,0] hexane

Solution

The correct IUPAC name is
bicyclo [2,2,0] hexane
Question 4
1 / -0

The highest boiling point is expected for:

A
iso-octane

B
n-octane

C
$$2,2,3,3$$-tetramethyl butane

D
n-pentane

Solution

We know higher branching in a compound results low boiling point.n-octane has highest boiling point as it is a straight chain of eight carbon atoms without branching.

The other compounds iso-octane and 2,2,3,3-tetramethyloctane have eight carbon atoms but have branching in the compound. So, they have less boiling point. n-pentane has five carbon atoms, which results lowering of boiling point than all the other compounds.
Question 5
1 / -0

The IUPAC name of the compound

A
3-bromomethyl-1-chloro-5-methyl hexane

B
1,1-dimethyl-3-bromoethyl-5-chloropentane

C
1-bromomethyl-2-chloroethyl-1-4-metyl pentane

D
4-bromomethyl-1-chloro-6-methyl heptane

Solution

The IUPAC name of the given compound is 3-bromomethyl-1-chloro-5-methyl hexane. The parent chain has 6 Carbon atoms so it is a hexane and the 3 Carbon has the bromomethyl group.

Hence, group (A) is the correct option.
Question 6
1 / -0

The IUPAC name of the given, is

A
bicyclo [4.3.1] decane

B
bicyclo [3.2.0] nonane

C
bicyclo [2.2.2] decane

D
bicyclo [3.3.0] nonane

Solution
Question 7
1 / -0

Select the correct IUPAC name of the following compound:

A
3-ethyl-1,5-dimethylcyclopentane

B
1-ethyl-3,4-dimethylcyclopentane

C
4-Ethyl-1,2-dimethylcyclopentane

D
2-ethyl-4,5-dimethylcyclopentane

Solution
Question 8
1 / -0

The relative rates of addition of

A
$$ I>II>III>IV>V $$

B
$$ V>IV>III>II>I $$

C
$$ II>III>I>IV>V $$

D
$$ IV>III>II>V>I $$

Solution

The relative rates of addition of given compounds is the order of stability of carbocation formed in the addition reaction.

Order of stability of carbocation:
$$\mathrm{I> II> III > IV > V}$$.

Hence, Option "A" is the correct answer.
Question 9
1 / -0

The IUPAC name of the compound is:

A
1-cyclopropyl-4-tert.butyl cyclohexane

B
4-chloropropyl-1-tert. butyl cyclohexane

C
1-cyclcopropyl hexyl-2,2-dimethylpropane

D
1-dimethyl ethyl-4-cyclopropyl cyclohexane

Solution
Question 10
1 / -0

Among the following the aromtic compounds is:

A

B

C

D

Solution

$$\text{According to Huckel rule for aromaticity, the molecule must be planar, cyclic system having delocalised }$$$$\text{(4nπ+2) electron where n is an integer i. e, 0, 1, 2, 3. Thus, aromatic compounds have 2, 6, 10 or 14π }$$$$\text{electrons. Among yhe following Cyclopropenyl cation (Δ) has 2π electron (n = 0) so, it is aromatic.}$$
$$\text{ Hence, option B is correct.}$$