Hydrocarbons Test

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Hydrocarbons Test - 20

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Weekly Quiz Competition

Question 1
1 / -0

Among the following compounds 2, 3-dimethylexane is :

A
i

B
ii

C
iii

D
iv

Solution

Simple nomenclature of alkane.
Question 2
1 / -0

Methane with the Molecular formula $$"CH_4"$$ has

A
$$4$$ Covalent bonds

B
$$8$$ Covalent bonds

C
$$6$$ Covalent bonds

D
$$2$$ Covalent bonds

Solution

Structure of methane $$H-\overset{\displaystyle H}{\overset{|}{\underset{\displaystyle H}{\underset{|}{C}}}}-H$$
It has $$4$$ covalent bonds.
Question 3
1 / -0

The boiling point will increase in the order of:

A
n-butane< iso-butane

B
n-butane <= iso-butane

C
n-butane= iso-butane

D
iso-butane< n-butane

Solution

Straight chain isomers have higher boiling point than the branched ones. Thus boiling point of n-butane is higher than iso-butane. Option (D) is correct.
Question 4
1 / -0

The number of total product produced upon monochloriation of (+) 2-chlorobutane is ___________.

A
3

B
4

C
5

D
6

Solution

B. 4
2-Chlorobutane as reactant will produce four$${ C }_{ 4 }{ H }_{ 8 }{ Cl }_{ 2 }$$.The products are-
$${ ClCH }_{ 2 }{ CHClCH }_{ 2 }{ CH }_{ 3 }+{ CH }_{ 3 }{ CCl }_{ 2 }{ CH }_{ 2 }{ CH }_{ 3 }+\\ { CH }_{ 3 }{ CHClCHClCH }_{ 3 }+{ CH }_{ 3 }{ CHClCH }_{ 2 }{ CH }_{ 2 }Cl$$
Question 5
1 / -0

Addition of $$HBr$$ on propene produce:

A
$$CH_3 CH_2 CH_2 Br$$

B
$$CH_3 BrCH_2 CH_3$$

C
$$CH_3-\underset{Br\,\,}{\underset{|}{C}H}-CH_3$$

D
none of these

Solution

The addition of $$HBr$$ to propene takes place according to Markownikoff's rule. According to this rule negative part of reagent adds to carbon atom having lesser number of hydrogen atoms.
$$CH_3CH=CH_2+HBr\rightarrow CH_3-\underset{Br\,\,\,}{\underset{|}{C}H}-CH_3$$
Question 6
1 / -0

The hydrocarbon obtained by treating sodium ethanoate with soda lime is _________.

A
ethane

B
methane

C
propane

D
butane

Solution

$${ CH }_{ 3 }COONa+NaOH\rightarrow { CH }_{ 4 }+{ Na }_{ 2 }{ CO }_{ 3 }$$

$$CH_3COONa$$=Sodium ethanoate
$$NaOH$$=Soda lime
$$CH_4$$=Methane
$$Na_2CO_3$$=Sodium carbonate
Question 7
1 / -0

The reaction of one mol of bromine with ethyne yields:

A
$$BrCH_2-CH_2Br$$

B
$$BrCH=CHBr$$

C
$$Br_2CH-CHBr_2$$

D
$$CH_3-CH_2Br$$

Solution

Halogens, especially chlorine and bromine on reaction with alkynes readily produces tetra-halogen derivatives of alkane. The reaction is carried out in inert solvent like carbon tetrachloride.

Due to the presence of two n-bonds, each molecule of the alkyne can react with two molecules of the halogen.
One mole of Bromine with ethyne gives 1,2-dibromoethene.
$$HC\equiv CH + Br_2 \xrightarrow{CCl_4} H(Br)C = C(Br)H$$
Question 8
1 / -0

Ethylidene dichloride is obtained by the reaction of excess of HCl with.

A
Ethylene

B
Acetylene

C
Propane

D
Methane

Solution

$$\underset{acetylene}{CH\equiv CH}+HCl\rightarrow \underset{vinyl chloride}{CH_2=CHCl}\overset{HCl}{\rightarrow} \underset{ethylidene dichloride}{CH_3CHCl_2}$$
[Alkenes due to presence of only $$1^o$$ of unsaturation, form only monochloro derivative.]
Question 9
1 / -0

X compound reacts with Na to give $$CH_3CH_2CH_2CH_3$$. The compound X is:

A
$$CH_3 CH_2 OH$$

B
$$CH_3 CH_2 - Cl$$

C
$$CH_3 - CH_3$$

D
$$CH_3 - CH_2 - CH_2 - CH_2 - OH$$

Solution

$$\underset{ethyl chloride}{CH_3 CH_2} Cl+2Na + Cl CH_2 CH_3 \rightarrow CH_3 - CH_2 - CH_2 CH_3 + 2 NaCl$$
This is Wurtz reaction.
Question 10
1 / -0

The compound formed when ethyl alcohol is treated with conc.$${H}_{2}{SO}_{4}$$ at $${170}^{o}C$$ is _______.

A
ethane

B
ethene

C
ethyne

D
ethanal

Solution

$$Ethanol$$ can be dehydrated to give $$ethene$$ by heating it with an excess of concentrated sulphuric acid at about 170C.
$$CH_3CH_2-OH \overset {Conc. H_2SO_4 170^oC}{\rightarrow} CH_2=CH_2 + H_2O$$

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Hydrocarbons Test - 20

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Hydrocarbons Test - 20

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SHARING IS CARING

Question 1

i

ii

iii

iv

Solution

Question 2

$$4$$ Covalent bonds

$$8$$ Covalent bonds

$$6$$ Covalent bonds

$$2$$ Covalent bonds

Solution

Question 3

n-butane< iso-butane

n-butane <= iso-butane

n-butane= iso-butane

iso-butane< n-butane

Solution

Question 4

3

4

5

6

Solution

Question 5

$$CH_3 CH_2 CH_2 Br$$

$$CH_3 BrCH_2 CH_3$$

$$CH_3-\underset{Br\,\,}{\underset{|}{C}H}-CH_3$$

none of these

Solution

Question 6

ethane

methane

propane

butane

Solution

Question 7

$$BrCH_2-CH_2Br$$

$$BrCH=CHBr$$

$$Br_2CH-CHBr_2$$

$$CH_3-CH_2Br$$

Solution

Question 8

Ethylene

Acetylene

Propane

Methane

Solution

Question 9

$$CH_3 CH_2 OH$$

$$CH_3 CH_2 - Cl$$

$$CH_3 - CH_3$$

$$CH_3 - CH_2 - CH_2 - CH_2 - OH$$

Solution

Question 10

ethane

ethene

ethyne

ethanal

Solution

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