Hydrocarbons Test

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Hydrocarbons Test - 74

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following has the highest boiling point

A
Neopentane

B
n-butane

C
n-heptane

D
Isobutane

Solution

The boiling point of n-heptane is 98.42 degrees celsius.

The boiling point of n-butane is -1 degrees celsius.

The boiling point of neopentane is 9.5 degrees celsius.

The boiling point of isobutane is -11.7 degrees celsius.

So $$ n-heptane$$ has the highest boiling point.
Question 2
1 / -0

The $$IUPAC$$ name of the compound
$$CH_3-CH(C_2H_5)-CH=CH-CH_3$$ is

A
$$4-$$ethyl$$-2-$$pentene

B
$$4-$$methyl$$-2-$$hexene

C
$$3-$$ethyl$$-2-$$pentene

D
$$2-$$ethyl$$-3-$$pentene
Question 3
1 / -0

Methane and ethane both can be obtained in single step from

A
$$CH_3I$$

B
$$C_2H_5I$$

C
$$CH_3OH$$

D
$$C_2H_5OH$$

Solution

Methyl iodide on wurtz reaction gives ethane and on reduction gives methane.

$$CH_3I + 2H \xrightarrow[]{Zn/HCl} CH_4 + HI$$

$$CH_3I + 2Na +ICH_3 \xrightarrow[\text{Ether}]{\text{Dry}} CH_3 - CH_3 + 2NaI$$
Question 4
1 / -0

Name the alkane with molecule formula $$C_{10}H_{20}$$

A
Dodecene

B
Undecene

C
Decene

D
Heptene

Solution
Question 5
1 / -0

Ortho-dihydroxy benzene is

A
Carvacrol

B
Resorcinol

C
Catechol

D
Orcinol

Solution

o-dihydroxy benzene or catechol.
Question 6
1 / -0

Reaction $$C_2H_5I + C_5H_{11}I + 2Na \rightarrow C_2H_5 - C_5H_{11} + 2NaI$$ is called

A
Hoffmann's reaction

B
Dow's reaction

C
Wurtz's reaction

D
Riemer - Tiemann's reaction

Solution

this type reaction is called Wurtz reaction
Question 7
1 / -0

1,2,3-trihydroxybenzene is also known as:

A
Pyrogallol

B
Phloroglucinol

C
Resorcinol

D
Quinol

Solution

1,2,3-Trihydroxybenzene, also known as pyrogallic acid or Pyrogallol. it's IUPAC name is benzene-1,2,3-triol.
Hence, option $$A$$ is correct.
Question 8
1 / -0

Which one of the following characteristics apply to both ethene and ethyne?

A
Explode when mixed with chlorine

B
Decolourise Baeyer's reagent giving brown precipitate

C
Rapidly absorbed by cold conc. $$H_{2}SO_{4}$$

D
Form white precipitate with silver nitrate solution

Solution

Both ethene and ethyne decolourise Baeyer's reagent giving a brown precipitate.

$$CH_{2}=CH_{2} + \underset{alk.}{KMnO_{4}}\xrightarrow [H_{2}O]{[O]}\underset{colourless}{\underset{OH}{\underset{|}{CH_{2}}}-\underset{OH}{\underset{|}{CH_{2}}}} + \underset{Brown}{MnO_{2}}$$

$$CH\equiv CH + \underset{alk.}{KMnO_{4}}\xrightarrow{[O]}\underset{Oxalic\ acid}{\underset{COOH}{\underset{\!\!\!\!\!\!\!\!|}{COOH}}} + \underset{Brown}{MnO_{2}}$$
Question 9
1 / -0

$$R-CH_{2}-CCl_{2}-R\xrightarrow[]{Reagent}R-C\equiv C-R$$

The reagent is

A
$$Na$$

B
$$HCl$$ and $$H_{2}O$$

C
$$KOH$$ in $$C_{2}H_{5}OH$$

D
$$Zn$$

Solution

$$R-CH_{2}-CCl_{2}-R\xrightarrow[]{KOH+C_{2}H_{5}OH}R-C\equiv C-R+2HCl$$

This reaction is an example of dehydrohalogenation. Hence, alcoholic $$KOH$$ is used as a reagent.
Question 10
1 / -0

Acetylene is obtained by the electrolysis of

A
Sodium succinate

B
Potassium fumarate

C
Both (A) and (B)

D
None of these

Solution

Acetylene is obtained by the electrolysis of Potassium fumarate.

$$\begin{matrix} CH & - & COOK & + \ 2H_{2}O\xrightarrow {Electrolysis} & CH & + \ 2CO_{ 2} \\ \!\!\!\! || & & & & \!\!\!\! ||| & \\ CH & - & COOK & & CH & \end{matrix}+2KOH+H_{2}$$

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Hydrocarbons Test - 74

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Hydrocarbons Test - 74

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Question 1

Neopentane

n-butane

n-heptane

Isobutane

Solution

Question 2

$$4-$$ethyl$$-2-$$pentene

$$4-$$methyl$$-2-$$hexene

$$3-$$ethyl$$-2-$$pentene

$$2-$$ethyl$$-3-$$pentene

Question 3

$$CH_3I$$

$$C_2H_5I$$

$$CH_3OH$$

$$C_2H_5OH$$

Solution

Question 4

Dodecene

Undecene

Decene

Heptene

Solution

Question 5

Carvacrol

Resorcinol

Catechol

Orcinol

Solution

Question 6

Hoffmann's reaction

Dow's reaction

Wurtz's reaction

Riemer - Tiemann's reaction

Solution

Question 7

Pyrogallol

Phloroglucinol

Resorcinol

Quinol

Solution

Question 8

Explode when mixed with chlorine

Decolourise Baeyer's reagent giving brown precipitate

Rapidly absorbed by cold conc. $$H_{2}SO_{4}$$

Form white precipitate with silver nitrate solution

Solution

Question 9

$$Na$$

$$HCl$$ and $$H_{2}O$$

$$KOH$$ in $$C_{2}H_{5}OH$$

$$Zn$$

Solution

Question 10

Sodium succinate

Potassium fumarate

Both (A) and (B)

None of these

Solution

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