Hydrocarbons Test

Result

Hydrocarbons Test - 34

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Weekly Quiz Competition

Question 1
1 / -0

Correct IUPAC name of the following compound is :

A
$$4-(1,1-dimethylethyl)-5-ethyloctane$$

B
$$5-ethyl -4-(1,1-dimethylethyl) octane$$

C
$$5-(1,1-dimethylethyl)-4-ethyloctane$$

D
$$4-ethyl-5-(1,1-dimethylethyl) octane$$
Question 2
1 / -0

The number of $$sp^2-s$$ sigma bonds is benzene are:

A
3

B
6

C
12

D
none of these

Solution

Benzene has molecular formula $$C_6H_6$$ that is there is the presence of a double bond in between alternate carbon atoms and each carbon is attached to $$two$$ carbon atoms by means of a single bond and a double bond and a hydrogen atom by a single bond. So there are a total of $$12$$ sigma bonds and $$3$$ pi bonds in benzene.
The carbon atoms are bonded through $$sp^2-Sp^2$$ overlap while six $$C-H$$ bond is formed by $$sp^2-s$$ sigma bond.
Thus there is $$6$$ $$sp^2-s$$ sigma bond.
Question 3
1 / -0

Which of the following is aromatic in nature

A

B

C

D
$$All \ of \ these$$

Solution

due to the presence of (4n + 2)πe- it follows Huckel's rule and therefore, it is aromatic.

So all of the given compound are aromatic .
Question 4
1 / -0

Double bond equivalent (degree of unsaturation) of $$(A) $$ is:

A
1

B
2

C
3

D
4

Solution

$$H_2/Pt$$ causes the catalytic hydrogenation of alkenes. Since 1 mole of the reagent is present, therefore, it will bring about the addition of $$H_2$$ at one double bond only. So, in the compound A, two cyclopentane rings are should be present along with a double bond.
Due to the presence of two rings and one double bond in A its double bond equivalent is 3. We can also calculate it using the formula.
Double bond equivalent $$= C+1-\dfrac{H}{2}-\dfrac{X}{2}+\dfrac{N}{2}$$
$$C=10, \ H=2 \ less \ than \ the \ product=18-2=16$$
$$DBE=10+1-\dfrac{16}{2}=10+1-8=3$$
Question 5
1 / -0

Which are the correct IUPAC name of the following compound ?

A
5-butyl-4-is isopropyldecane

B
5-ethyl-4-propyldecane

C
5-sec-butyl-4-isopropyldecane

D
4-(1-methylethyl)-5-(1-methylpropyl)decane
Question 6
1 / -0

In the following reaction, the major product is:

A

B

C

D

Solution

Option A is correct.
Question 7
1 / -0

1, 1 -dibromoethane when heated with zine dust produces_____.

A
ethyl bromide

B
ethene

C
vinyl bromide

D
2 - butene

Solution
Question 8
1 / -0

If two moles of isopropyl chloride reacts with $$Na$$ in presence of dry ether. Which alkane is formed?

A
Hexane

B
2, 3-Dimethyl butane

C
Isopentane

D
Neopentane

Solution

The above reaction is $$Wurtz\ reaction.$$ In the Wurtz reaction two alkyl halides react with each other to form alkane. In the given reaction the name of the product formed is $$2,3-dimethyl \ butane.$$

Option B is correct.
Question 9
1 / -0

IUPAC name of the given compound is:

A
2-Methyl-2, 3-diethyl pentane

B
4-Ethyl-3, 3-dimethyl hexane

C
3,4-Diethyl-4-methyl pentane

D
3-Ethyl-4, 4-dimethyl hexane
Question 10
1 / -0

What is the Possible number of alkadienes with molecular formula $$C_5H_8$$? (Excluding stereoisomers)

A
4

B
5

C
6

D
2

Solution

No. of alkadienes with molecular formula $$C_{5}H_{8}$$ (excluding stereoisomers) are:
1) $${ H }_{ 3 }C-HC=C=CH-C{ H }_{ 3 }$$
2) $${ H }_{ 2 }C=C=CH-C{ H }_{ 2 }-C{ H }_{ 3 }$$
3) $${ H }_{ 2 }C=CH-C{ H }_{ 2 }-CH=C{ H }_{ 2 }$$
4) $${ H }_{ 2 }C=CH-CH=CH-C{ H }_{ 3 }$$
5) $$\quad \quad \quad \quad \quad C{ H }_{ 3 }\\ \hspace{2mm} \quad \quad \quad \quad \quad |\\ { H }_{ 2 }C=C=C-C{ H }_{ 3 }$$
6) $$\quad \quad \quad \quad \quad \quad C{ H }_{ 3 }\\ \hspace{2mm} \quad \quad \quad \quad \quad \quad |\\ { H }_{ 2 }C=CH-C=C{ H }_{ 2 }$$
So, the total number of alkadienes with molecular formula $$C_{5}H_{8}$$ (excluding stereoisomers) is 6.