Hydrocarbons Test

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Hydrocarbons Test - 17

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Weekly Quiz Competition

Question 1
1 / -0

Which out of following hydrocarbons undergo addition reaction?
$$\displaystyle C_2H_6, C_3H_8, C_3H_6, C_2H_2$$ and $$CH_4$$

A
$$C_2H_6$$ and $$C_3H_8$$

B
$$C_3H_6$$ and $$C_2H_2$$

C
$$CH_4$$ and $$C_2H_6$$

D
$$C_3H_8$$ and $$C_2H_2$$

Solution

Only unsaturated hydrocarbons undergo addition reaction. Among the given compounds only $$C_3H_6$$ (Propyne) and $$C_2H_2$$ (acetylene) are unsaturated Hydrocarbons.
Question 2
1 / -0

Two addition products on reaction with hydrogen is given by:

A
ethene

B
but-2-yne

C
ethane

D
ethenol

Solution

But-2-yne gives two addition products on reaction with hydrogen as cis $$2-$$butene and trans $$2-$$butene
Question 3
1 / -0

Which of the following gives propyne on hydrolysis?

A
$$Al_{4}C_{3}$$

B
$$Mg_{2}C_{3}$$

C
$$B_{4}C$$

D
$$La_{4}C_{3}$$

Solution

$$Mg_2C_3$$ on hydrolysis gives propyne and $$Mg(OH)_2.$$

$$Mg_2C_3+4H_2O\rightarrow 2Mg(OH)_2+C_3H_4$$.

Hence option B is correct.
Question 4
1 / -0

$$ { C }_{ 2 }{ H }_{ 4 }+{ H }_{ 2 }\xrightarrow [ ]{ { Ni }/{ Pd } } { C }_{ 2 }{ H }_{ 6 } $$,
name of this reaction is:

A
substitution

B
hydrogenation

C
alkanes formation

D
dehydrohalogenation

Solution

When hydrogen is added to any unsaturated hydrocarbon in the presence of a catalyst to form saturated hydrocarbon or alkanes,it is known as addition reaction or also known as hydrogenation. It has wide application when vegetable oil is converted to vanaspati ghee by this reaction.
Question 5
1 / -0

Which of then following hydrocarbons undergo addition reactions?
(i) $$ C_{2}H_{5} $$ (ii) $$ C_{3}H_{8} $$ (iii) $$ C_{3}H_{6} $$ (iv) $$ C_{2}H_{2} $$

A
only (i)

B
(ii) and (iii)

C
(iii) and (iv)

D
(ii) and (iv)

Solution

$$C_{2}H_{2}$$ and $$C_{3}H_{6}$$ will give addition reactions.
Question 6
1 / -0

Which of the following is soluble in methanol:
I : Hexane
II : Cyclohexane
III : $$2-methyl pentane$$
IV : Chloroethane

A
$$I$$

B
$$IV$$

C
$$II$$

D
$$III$$

Solution

Like dissolves like.
Chloroethane is being polarly miscible in methanol.
cyclohexane, hexane, $$2-methylpentane$$ are non-polar and immiscible with methanol.
Question 7
1 / -0

Which of the following types of reactions occur when a hydrocarbon has a double bond?

A
Substitution reaction

B
Addition reaction

C
Photolysis

D
None of the above

Solution

If a hydrocarbon has a double bond then to make it a single bond, if some radical comes and is added to that double bond it becomes a single bond and attains stability. As it is getting added, therefore, it is called addition reaction.
Question 8
1 / -0

Which of the following hydrocarbons undergo addition reactions?

A
$$C_3H_6$$

B
$$C_2H_6$$

C
$$CH_4$$

D
$$C_3H_8$$

Solution

Formation of larger molecules by addition of more radicals is known as addition reaction. Thus, unsaturated hydrocarbons undergo addition reactions. Since, $$C_3H_6$$ is unsaturated hydrocarbon, thus will undergo addition reactions
Question 9
1 / -0

The percentage of isomers formed during monobromination of $$2, 3-dimethyl$$ butane at room temperature relative to $$1, 2, 3$$ H atoms to chlorination is $$(1.0 : 3.8 : 5.0)$$

A
81%

B
56%

C
15%

D
22%

Solution

(A) is obtained from the reaction of $$12$$ equivalent $$1$$ H atoms.
(B) is obtained from the reaction of two equivalent $$3$$ H atoms.
Percentage of (A) $$ = \cfrac{12\times 100}{33}\, = 54.5%$$
Percentage of (B) $$ = \cfrac{10\times 100}{22}\, = 45.5$$
$$12\times 1 = 12.0$$
$$2\times 5 = 10.0$$
Total $$= 22.0$$
Question 10
1 / -0

Which one of the following compounds gives methane on treatment with water?

A
$${Al_4C_3}$$

B
$${CaC_2}$$

C
VC

D
SiC

Solution

$${Al_4C_3}$$ gives methane on treatment with water
$${Al_4C_3+12 H_2O\rightarrow 4Al(OH)_3+3CH_4}$$.
Hence option A is correct.

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Hydrocarbons Test - 17

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Hydrocarbons Test - 17

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Question 1

$$C_2H_6$$ and $$C_3H_8$$

$$C_3H_6$$ and $$C_2H_2$$

$$CH_4$$ and $$C_2H_6$$

$$C_3H_8$$ and $$C_2H_2$$

Solution

Question 2

ethene

but-2-yne

ethane

ethenol

Solution

Question 3

$$Al_{4}C_{3}$$

$$Mg_{2}C_{3}$$

$$B_{4}C$$

$$La_{4}C_{3}$$

Solution

Question 4

substitution

hydrogenation

alkanes formation

dehydrohalogenation

Solution

Question 5

only (i)

(ii) and (iii)

(iii) and (iv)

(ii) and (iv)

Solution

Question 6

$$I$$

$$IV$$

$$II$$

$$III$$

Solution

Question 7

Substitution reaction

Addition reaction

Photolysis

None of the above

Solution

Question 8

$$C_3H_6$$

$$C_2H_6$$

$$CH_4$$

$$C_3H_8$$

Solution

Question 9

81%

56%

15%

22%

Solution

Question 10

$${Al_4C_3}$$

$${CaC_2}$$

VC

SiC

Solution

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