Hydrocarbons Test

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Hydrocarbons Test - 22

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Weekly Quiz Competition

Question 1
1 / -0

The IUPAC name of given compound is:

A
$$3$$-Ethyl-$$4,4$$-dimethylheptane

B
$$1,1$$-diethyl-$$2,2$$-dimethylpentane

C
$$4,4$$-dimethyl-$$5,5$$-diethylpentane

D
$$5,5$$-diethyl-$$4,4$$-dimethylpentane

Solution

The open-chain structure of IMAGE $$01$$ will look like IMAGE $$02$$.

According to the structure as referring to IMAGE $$02$$, first of all, long chain is selected, i.e., here it is of $$7$$ carbon.

So, it will be named as heptane and then third and fourth carbon contains one ethyl and $$2$$ methyl group.

So it will be named as $$3-Ethyl-4,4-dimethylheptane$$.
Question 2
1 / -0

Which of the following names is accepted in IUPAC?

A
$$ \alpha $$ butylene

B
$$ \beta $$ pentylene

C
$$ \alpha $$ hexylene

D
All of the above

Solution

The names $$ \alpha $$ butylene, $$ \beta $$ pentylene and $$ \alpha $$
hexylene are accepted in IUPAC. Other common names accepted in IUPAC
are ethylene, propylene and isobutylene.
Question 3
1 / -0

Methane can be converted into ethane by :

A
chlorination followed by the reaction with alcoholic $$KOH$$

B
chlorination followed by the reaction with aqueous $$KOH$$

C
chlorination followed by Wurtz reaction

D
chlorination followed by decarboxylation

Solution

Explanation:
To covert methane to ethane, i.e. $$CH_4\ to\ C_2H_6,$$ methane is treated with chlorine gas in the presence of ultraviolet light to form chloromethane. Chloro methane is treated with sodium metal and dry ether to form the product ethane. This process is also called Wurtz synthesis.

Chemical reactions are as follows:

$$CH_4+Cl_2\rightarrow CH_3Cl+HCl$$ (in presence of sunlight) this is chlorination

$$2CH_3Cl+Na\rightarrow C_2H_6$$ (in presence of dry ether) this is wurtz reaction.

So, option C is correct
Question 4
1 / -0

What is the name of the group $$ \displaystyle CH_3-CH=CH-CH_2-$$?

A
Vinyl

B
Allyl

C
Crotyl

D
Isopropenyl

Solution

The name of the group $$ \displaystyle CH_3-CH=CH-CH_2-$$ is crotyl. It is also named as 2-butenyl.
Question 5
1 / -0

What is the name of the given alkene?

A
3-propylpenta-1,4-diene

B
3-propenylhexene

C
4-propenylhexene

D
3-propylpenta-1,4-dienyl

Solution

The name of the given alkene is 3-propylpenta-1,4-diene.
The longest continuous chain should include both the double bonds.
Question 6
1 / -0

Which of the following is 2-propargyl?

A
$$\displaystyle HC \equiv C CH_2-$$

B
$$\displaystyle HC \equiv C- $$

C
$$\displaystyle CH_3-C \equiv C -$$

D
$$\displaystyle CH_3-CH_2-C \equiv C -$$

Solution

$$\displaystyle HC \equiv C CH_2-$$ is 2-propargyl. it is also called 2-propynyl.
Question 7
1 / -0

What is the name of the group $$ \displaystyle CH_2=CH-CH_2-$$?

A
allyl

B
vinyl

C
crotyl

D
1-methylvinyl

Solution

The name of the group $$ \displaystyle CH_2-=CH-CH_2-$$ is allyl or 2-propenyl.
Vinyl group is $$ \displaystyle CH_2=CH-$$
Crotyl group is $$ \displaystyle CH_3-
CH=CH-CH_2-$$
1-methylvinylgroup is $$ \displaystyle CH_2=C(CH_3)-$$
Question 8
1 / -0

What is the name of the given alkene?

A
5-Methyl-3-propylhex-1-ene

B
2-methyl-4-vinylheptane

C
4-methyl-2-vinylheptane

D
2-methyl-4-propylhex-5-ene

Solution

The name of the given alkene is 5-Methyl-3-propylhex-1-ene.
The longest continuous chain should include both the carbon atoms of the double bond.
The chain is numbered from the end that gives the lower number to the first carbon atom of the double bond.
Question 9
1 / -0

Which of the following represents ethyl acetylene?

A
$$\displaystyle CH_3CH_2C \equiv CH$$

B
$$\displaystyle CH_3C \equiv CH$$

C
$$\displaystyle HC \equiv CH$$

D
$$\displaystyle CH_3-C \equiv C-CH_3$$

Solution

$$\displaystyle CH_3CH_2C \equiv CH$$ represents ethyl acetylene.
$$\displaystyle HC \equiv CH$$ is acetylene, $$\displaystyle CH_3C \equiv CH$$ is methyl acetylene and $$\displaystyle CH_3-C \equiv C-CH_3$$ is dimethyl acetylene.
Question 10
1 / -0

Which type of isomerism is shown by But-1-yne and cyclobutene?

A
Ring chain isomerism

B
Chain isomerism

C
Position isomerism

D
Metamerism

Solution

Ring chain isomerism is shown by But-1-yne and cyclobutene.
Alkynes are isomeric with cycloalkenes containing the same number of carbon atoms.

One compound is open chain and other is cyclic and both have same molecular formula that is C4H6. Also, the both have different functional groups, so they are functional isomers.

All ring chain isomers are functional isomers but all functional isomers are not ring chain isomers.