Hydrocarbons Test

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Hydrocarbons Test - 45

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Weekly Quiz Competition

Question 1
1 / -0

Methyl bromide is converted into ethane by heating it in ether medium with:

A
Al

B
Zn

C
Na

D
Cu

Solution

Methyl Bromide can be converted to ethane by wurtz's reaction:
$$\mathrm{2CH_3Br+2Na\xrightarrow{Dry\ ether} CH_3-CH_3 +2NaBr}$$

Hence, Option "C" is the correct answer.
Question 2
1 / -0

Which of the following is an appropriate set of reactants for the preparation of 1-methoxy-4-nitrobenzene ?

A
both A and B

B
only A

C
only B

D
none of these

Solution
Question 3
1 / -0

Carbon-carbon bond distance in benzene is

A
Longer than a $$C = C$$ double bond

B
Shorter than a $$C = C$$ double bond

C
Shorter than a $$C = C$$ triple bond

D
Longer than a $$C - C$$ single bond

Solution

Carbon-carbon single bond is longer than carbon-carbon double bond because, bond length depend on the percentage s character.
Question 4
1 / -0

Which of the following is not aromatic?

A
Benzene

B
Cyclopropenyl cation

C
Tropylium cation

D
Cyclopentadienyl cation

E
Cyclopentadienyl anion

Solution
Question 5
1 / -0

The benzene molecule is

A
Trigonal

B
Tetrahedral

C
Planar

D
Pyramidal

Solution

The shape of Benzene is a $$planar $$ regular hexagon, with bond angles of 120°.

This is easily explained.

It is a regular hexagon because all the bonds are identical. The delocalisation of the electrons means that there aren't alternating double and single bonds.
Question 6
1 / -0

The centric formula of benzene was proposed by

A
Dewar

B
Baeyer and Armstrong

C
Ladenbarg

D
Kekule

Solution

Centric structure of benzene was proposed by $$Armstrong \ and\ Baeyer$$.
Question 7
1 / -0

Which gives only monosubstituted product?

A
o-Dinitrobenzene

B
m-Dinitrobenzene

C
p-Dinitrobenzene

D
Nitrobenzene

Solution

m-Dinitrobenzene will give only monosubstituted product. $$NO_2$$ group is meta directing group and there is only one $$meta-$$ position available in case of m-dinitrobenzene.
Question 8
1 / -0

The carbon-carbon bond length in benzene is:

A
Same as in $$C_{2}H_{4}$$

B
In between $$C_{2}H_{6}$$ and $$C_{2}H_{2}$$

C
In between $$C_{2}H_{6}$$ and $$C_{2}H_{4}$$

D
In between $$C_{2}H_{4}$$ and $$C_{2}H_{2}$$

Solution

We know, that there are only sigma bonds in ethane (C₂H₆), one sigma and one PI bond in ethene (C₂H₄), and one sigma and two PI bonds in acetylene (C₂H₂). Benzene (C₆H₆) is an aromatic compound, and due to resonance, there is partial double bonds everywhere.
Now, hybridization of carbons of alkane is $$sp^3$$, that of alkene is $$sp^2$$, and that of alkyne is $$sp$$. Thus, in $$sp$$, there's an increased s-character, that reduces the bond length.
Hence the correct options is C.
Question 9
1 / -0

Which does not show substitution in benzene ring?

A
$$ClSO_{3}H$$

B
$$Conc. H_{2}SO_{4}$$ on heating

C
$$Conc. HCl$$

D
$$CH_{3}Cl/ AlCl_{3}$$

Solution

Benzene would never react with $$HCl.$$ As $$HCl$$ as an inorganic acid doesn't have electrophile to replace the $$H$$ atom of benzene. Here $$Cl$$ act as Lewis base so it doesn't act as an electrophile . Also, addition does not take place if it does it lose its aromaticity.
Question 10
1 / -0

Which is not an aromatic compound?

A
Pyridine

B
Xylene

C
Naphthalene

D
Cyclohexane

Solution

Cyclohexane is not aromatic since it does not have alternating double and single bonds between the C-atoms.

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Hydrocarbons Test - 45

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Hydrocarbons Test - 45

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Question 1

Al

Zn

Na

Cu

Solution

Question 2

both A and B

only A

only B

none of these

Solution

Question 3

Longer than a $$C = C$$ double bond

Shorter than a $$C = C$$ double bond

Shorter than a $$C = C$$ triple bond

Longer than a $$C - C$$ single bond

Solution

Question 4

Benzene

Cyclopropenyl cation

Tropylium cation

Cyclopentadienyl cation

Cyclopentadienyl anion

Solution

Question 5

Trigonal

Tetrahedral

Planar

Pyramidal

Solution

Question 6

Dewar

Baeyer and Armstrong

Ladenbarg

Kekule

Solution

Question 7

o-Dinitrobenzene

m-Dinitrobenzene

p-Dinitrobenzene

Nitrobenzene

Solution

Question 8

Same as in $$C_{2}H_{4}$$

In between $$C_{2}H_{6}$$ and $$C_{2}H_{2}$$

In between $$C_{2}H_{6}$$ and $$C_{2}H_{4}$$

In between $$C_{2}H_{4}$$ and $$C_{2}H_{2}$$

Solution

Question 9

$$ClSO_{3}H$$

$$Conc. H_{2}SO_{4}$$ on heating

$$Conc. HCl$$

$$CH_{3}Cl/ AlCl_{3}$$

Solution

Question 10

Pyridine

Xylene

Naphthalene

Cyclohexane

Solution

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