Hydrocarbons Test

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Hydrocarbons Test - 12

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Weekly Quiz Competition

Question 1
1 / -0

2-Methyl butane on reacting with bromine in presence of sunlight gives mainly :

A
1-Bromo-2-methyl butane

B
2-Bromo-2-methyl butane

C
2-Bromo-3-methyl butane

D
1-Bromo-3-methyl butane

Solution

$$CH_3CH(CH_3)CH_2CH_3+Br_2 \overset{sunlight} {\longrightarrow}H_3CC(Br)(CH_3)CH_2CH_3$$

The reaction proceeds via the free radical mechanism.

Since the radical formed in this case is tertiary, as it is more stable than primary and secondary, 2-Bromo-2-methyl butane is formed.

Option B is correct.
Question 2
1 / -0

Difference in the molecular formulae of $$D$$ and $$C$$ is:

A
$${ C }_{ 2 }{ H }_{ 3 }$$

B
$${ C }_{ 2 }{ H }_{ 4 }$$

C
$${ CH }_{ 2 }$$

D
$${ C }_{ 3 }{ H }_{ 6 }$$

Solution

$$RMgX \xrightarrow {Methanol} \underset {A } {CH_3CH_3} \xrightarrow [h \nu] {1 \ mole \ of \ chlorine} \underset {B} {CH_3CH_2-Cl} $$

$$\underset {B} {CH_3CH_2-Cl}\xrightarrow [Ethanol] {Zn-Cu} \underset {C} {CH_3CH_3} $$

$$\underset {B} {CH_3CH_2-Cl}\xrightarrow {Na/ dry ether} \underset {D}{CH_3CH_2CH_2CH_3} $$
Difference in the molecular formulae of $$D$$ and $$C$$ is $${ C }_{ 2 }{ H }_{ 4 }$$.
Question 3
1 / -0

$$\left( { CH }_{ 3 } \right) _{ 3 }C-MgCl$$ on reaction with $${ D }_{ 2 }O$$ produces :

A
$$\left( { CH }_{ 3 } \right) _{ 3 } CD$$

B
$$\left( { CH }_{ 3 } \right) _{ 3 } OD$$

C
$$\left( { CD }_{ 3 } \right)C MgCl$$

D
$$\left( { CD }_{ 3 } \right) _{ 3 } OD$$

Solution

$$\left( { CH }_{ 3 } \right) _{ 3 }C-MgCl$$ is a strong base.

$$\left( { CH }_{ 3 } \right) _{ 3 }C-MgCl$$ + $$D_2O$$ $$\longrightarrow $$ $$\left( { CH }_{ 3 } \right) _{ 3 }C-D$$ + $$MgBrOD$$.
Question 4
1 / -0

Which of the following type of reaction ethylene undergoes readily?

A
Elimination

B
Addition

C
Rearrangement

D
Substitution

Solution

$$CH_2=CH_2+Cl_2\rightarrow CH_2Cl-CH_2Cl$$
(1,2-dichloroethane)

Ethylene undergoes addition reactions, as they contain double bond..

Option B is correct.
Question 5
1 / -0

Statement-1: Alkenes participate in addition reactions
Statement-2: Alkenes are unsaturated hydrocarbons

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

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

C
statement-1 is is True Statement_2 is False

D
statement-1 is False statement-2 is True.

Solution

As alkenes are unsaturated hydrocarbons so they have atleast one double bond which can participate in addition reaction, so they can perform addition reaction (like with halogens, hydrogen, halogen acids etc.).
Question 6
1 / -0

Common name of alkenes is :

A
Olefins

B
Paraffins

C
Acetylene

D
Arenes

Solution

Olefin also called alkene, with the general formula $$C_nH_{2n}$$
Question 7
1 / -0

The reaction $${ C }_{ 12 }{ H }_{ 26 }\rightarrow { C }_{ 6 }{ H }_{ 12 }+{ C }_{ 6 }{ H }_{ 14 }$$ represents :

A
Substitution

B
synthesis

C
Cracking

D
Addition.

Solution

Hydrocarbon cracking is the process of breaking a long-chain of hydrocarbons into short ones.
Question 8
1 / -0

Which isomerism relates 2-methyl-1-butene and 2-methyl-2-butene?

A
Optical isomerism

B
Geometrical isomerism

C
Positional isomerism

D
Metamerism

Solution

2-methyl-1-butene is $$CH_2=C(CH_3)-CH_2-CH_3$$ and 2-methyl-2-butene is $$CH_3-C(CH_3)=CH-CH_3$$.

These are position isomers as the functional groups (double bond (alkene) in this case) are in different positions in the same carbon chain.

Option C is correct.
Question 9
1 / -0

The IUPAC name of the compound $${ H }_{ 2 }C=CH-CH\left( { CH }_{ 3 } \right) _{ 2 }$$:

A
2-vinyl propene

B
1, 1-dimethyl-2-propene

C
3-methyl-1-butene

D
1-isopropyl ethylene

Solution

IUPAC name of the compound $${ H }_{ 2 }C=CH-CH\left( { CH }_{ 3 } \right) _{ 2 }$$ is 3-Methyl-1-butene as methyl is substituted at carbon no.3 and also double bond is present there at carbon no. 1.
Question 10
1 / -0

IUPAC name of $$CH_{3}-CH(CH_{3})-C\equiv C-CH(CH_{3})-CH_{3}$$ is:

A
2,5-dimethyl-3-hexyne

B
2,5-dimethyl-2-hexyne

C
3,5-dimethyl-3-hexyne

D
2-pentane

Solution

1 2 3 4 5 6
$$CH_{3}-CH(CH_{3})-C\equiv C-CH(CH_{3})-CH_{3}$$

The given compound is alkyne as it contains a triple bond. Its parent chain contains 6 carbon atom.

As methyl is present as substituent group at carbon no. 2 and 5 and a triple bond is present at carbon number 3.

So, IUPAC name of the compound is 2,5-dimethyl-3-hexyne.

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Re-Attempt Weekly Quiz Competition

Hydrocarbons Test - 12

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Hydrocarbons Test - 12

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Question 1

1-Bromo-2-methyl butane

2-Bromo-2-methyl butane

2-Bromo-3-methyl butane

1-Bromo-3-methyl butane

Solution

Question 2

$${ C }_{ 2 }{ H }_{ 3 }$$

$${ C }_{ 2 }{ H }_{ 4 }$$

$${ CH }_{ 2 }$$

$${ C }_{ 3 }{ H }_{ 6 }$$

Solution

Question 3

$$\left( { CH }_{ 3 } \right) _{ 3 } CD$$

$$\left( { CH }_{ 3 } \right) _{ 3 } OD$$

$$\left( { CD }_{ 3 } \right)C MgCl$$

$$\left( { CD }_{ 3 } \right) _{ 3 } OD$$

Solution

Question 4

Elimination

Addition

Rearrangement

Substitution

Solution

Question 5

Both Statement-1 and Statement-2 are correct. Statement-2 is a correct explanation of Statement-1.

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

statement-1 is is True Statement_2 is False

statement-1 is False statement-2 is True.

Solution

Question 6

Olefins

Paraffins

Acetylene

Arenes

Solution

Question 7

Substitution

synthesis

Cracking

Addition.

Solution

Question 8

Optical isomerism

Geometrical isomerism

Positional isomerism

Metamerism

Solution

Question 9

2-vinyl propene

1, 1-dimethyl-2-propene

3-methyl-1-butene

1-isopropyl ethylene

Solution

Question 10

2,5-dimethyl-3-hexyne

2,5-dimethyl-2-hexyne

3,5-dimethyl-3-hexyne

2-pentane

Solution

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