Hydrocarbons Test

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Hydrocarbons Test - 21

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following compounds on hydrolysis produces methane?

A
$$Ca{CN}_{2}$$

B
$$Ca{C}_{2}$$

C
$${Al}_{4}{C}_{3}$$

D
$$SiC$$

Solution

Aluminium carbide on hydrolysis produces methane, and aluminium hydroxide.
$$Al_4C_3 + 12H_2O\rightarrow 4Al(OH)_3 + 3CH_4$$
Hydrolysis is a reaction that takes place between a substance and water, as a result of which the substance and water break down, and new compounds form.
Question 2
1 / -0

When ethene undergoes addition reaction with chlorine, it gives:

A
methane

B
dichloroethene

C
dichloroethane

D
propane

Solution

When ethene undergoes addition reaction with chlorine, it gives dichloroethane.
$$CH_2=CH_2+Cl_2 \rightarrow ClCH_2-CH_2Cl+H_2$$

Option C is correct.
Question 3
1 / -0

Ethylene is a/an :

A
saturated hydrocarbon

B
alkene

C
paraffin

D
aromatic compound

Solution

Ethylene is an alkene (unsaturated hydrocarbon) with the structure; $$ CH_{2}= CH_{2}$$
Question 4
1 / -0

Which one of the following lists the alkane in order of decreasing boiling point?

A
Octane, Methane, Butane, Ethane

B
Methane, Ethane, Propane, Butane

C
Hexane, Octane, Propane, Methane

D
Hexane, Pentane, Propane, Ethane

Solution

As the number of carbon atoms in alkanes increases the number of different isomers increases dramatically. To give an indication of the variation in boiling points of different isomers of the same alkane, cycloalkanes have boiling points typically around $$10^0C$$ to $$20^0C$$ higher than the corresponding linear alkane. Boiling points of alkanes increase with an increase in the number of n. A straight-chain alkane will have a boiling point higher than a branched-chain alkane due to the greater surface area in contact, thus the greater van der Waals forces, between adjacent molecules. Thus Hexane>Pentane>propane>ethane.
Question 5
1 / -0

Statement 1: The double and single bonds in benzene are subject to resonance.
Statement 2: Benzene has de-localized pi electrons that stabilize its structure

A
Both Statement 1 and Statement 2 are correct and Statement 2 is the correct explanation of Statement 1.

B
Both Statement 1 and Statement 2 are correct and Statement 2 is not the correct explanation of Statement 1.

C
Statement 1 is correct but Statement 2 is not correct.

D
Statement 1 is not correct but Statement 2 is correct.

E
Both the Statement 1 and Statement 2 are not correct.

Solution

The resonance structure of benzene is shown in the figure. It can be clearly seen from the figure that the pi-bonds in benzene are delocalized over the entire ring leading to resonance stabiization. This delocalization provides partial double bond character to all the bonds in benzene, due to which all the bond lengths in benzene are equal and it has a resonance hybrid as shown in the figure. Hence both the statements are correct and statement 2 is the correct explanation of statement 1
Question 6
1 / -0

$$C_{7}H_{8} \xrightarrow {3Cl_{2}, Heat} A\xrightarrow {Fe/ Br_{2}} B\xrightarrow {Zn/ HCl} C$$
Here, the compound $$C$$ is:

A
3-bromo-2,4,6-trichlorotoluene

B
o-bromotoluene

C
p-bromotoluene

D
m-bromotoluene

Solution
Question 7
1 / -0

Secondary butyl chloride will undergo alkaline hydrolysis in the polar solvent by the mechanism

A
$${S}_{N}2$$

B
$${S}_{N}1$$

C
$${S}_{N}1$$ and $${S}_{N}2$$

D
None of the above

Solution

$${S}_{N}1$$ mechanism is favored by polar solvents like water, in which the rate of the reaction only depends on the concentration of the alkyl halide.
Question 8
1 / -0

In a series of liquid hydrocarbons, a sample of the diagramed compound would be best identified by which of the following?
Viscosity Capillary Action
A High High
B High Low
C Low High
D Low Low

A
A

B
B

C
C

D
D

Solution

The given hydrocarbon is Hexane usually liquid. Liquids has the physical properties of high viscosity and high carpillary action.
Question 9
1 / -0

Which of the following hydrocarbons have the highest boiling point?

A
$$CH_4$$

B
$$C_3H_8$$

C
$$C_4H_{10}$$

D
$$C_5H_{12}$$

E
$$C_6H_{14}$$

Solution

Hexane $$\displaystyle C_6H_{14}$$ has the highest boiling point as it has maximum number of C atoms and maximum molecular weight.
With increase in the molecular weight, the boiling point of straight chain hydrocarbons increases.
Question 10
1 / -0

What is the name of the alkene $$H_2C=CH-CH=CH_2$$?

A
1,3-butadiene

B
1,3-butanediene

C
1,3-dibutene

D
1,3-dibutadiene

Solution

The name of the given compound is$$\text{1,3-butadiene}$$

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	Viscosity	Capillary Action
A	High	High
B	High	Low
C	Low	High
D	Low	Low

Hydrocarbons Test - 21

Result

Hydrocarbons Test - 21

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Question 1

$$Ca{CN}_{2}$$

$$Ca{C}_{2}$$

$${Al}_{4}{C}_{3}$$

$$SiC$$

Solution

Question 2

methane

dichloroethene

dichloroethane

propane

Solution

Question 3

saturated hydrocarbon

alkene

paraffin

aromatic compound

Solution

Question 4

Octane, Methane, Butane, Ethane

Methane, Ethane, Propane, Butane

Hexane, Octane, Propane, Methane

Hexane, Pentane, Propane, Ethane

Solution

Question 5

Both Statement 1 and Statement 2 are correct and Statement 2 is the correct explanation of Statement 1.

Both Statement 1 and Statement 2 are correct and Statement 2 is not the correct explanation of Statement 1.

Statement 1 is correct but Statement 2 is not correct.

Statement 1 is not correct but Statement 2 is correct.

Both the Statement 1 and Statement 2 are not correct.

Solution

Question 6

3-bromo-2,4,6-trichlorotoluene

o-bromotoluene

p-bromotoluene

m-bromotoluene

Solution

Question 7

$${S}_{N}2$$

$${S}_{N}1$$

$${S}_{N}1$$ and $${S}_{N}2$$

None of the above

Solution

Question 8

A

B

C

D

Solution

Question 9

$$CH_4$$

$$C_3H_8$$

$$C_4H_{10}$$

$$C_5H_{12}$$

$$C_6H_{14}$$

Solution

Question 10

1,3-butadiene

1,3-butanediene

1,3-dibutene

1,3-dibutadiene

Solution

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