Organic Chemistry Test

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Organic Chemistry Test - 8

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Weekly Quiz Competition

Question 1
1 / -0

The function of adding calcium oxide in the preparation of methane from sodium acetate is

A
to prevent the deliquency of caustic soda

B
to speed up the reaction

C
to undergo chemical reaction with sodium acetate

D
all of these

Solution

The function of adding calcium oxide in the preparation of methane from sodium acetate is to prevent the deliquency of caustic soda.
Question 2
1 / -0

Which of the following is a saturated compound?

A
C₃H₈

B
C₄H₈

C
C₃H₆

D
C₅H₈

Solution

A saturated compound is a chemical compound that has a chain of carbon atoms linked together by single bonds. Thus, from the above given compounds, C₃H₈ contains only single bonds between the elements.
Question 3
1 / -0

How many hydrogen atoms are there in a compound of octane?

A
8

B
16

C
14

D
18

Solution

Octane has 8 carbon atoms and it is an alkane.
Thus, the number of hydrogen atoms is 2 x 8 + 2 = 18
Hence, option (4) is correct.
Question 4
1 / -0

Which of the following is a correct homologous series of compounds?

A
CH₄, C₂H₆, C₄H₁₀, C₈H₁₈

B
CH₄, C₂H₆, C₃H₈, C₄H₁₀

C
CH₄, C₂H₆, C₄H₁₀, C₆H₁₄

D
CH₄, C₃H₈, C₆H₁₄, C₉H₂₀

Solution

Correct homologous series of compounds: CH₄, C₂H₆, C₃H₈, C₄H₁₀
Question 5
1 / -0

Which of the following correctly represents the compound Bromopentane?

A
H₃C – CH₂ – CH₂ = CH₂CHBr

B
H₃C – CH₂ – CH = CH – CH₂Br

C
H₃C – CH₂ – CH₂ – CH₂ – CH₂Br

D
H₃C – CH₂ – CH₂ – CH₂ – CHBr

Solution

H₃C – CH₂ – CH₂ – CH₂ – CH₂Br is bromopentane.
Question 6
1 / -0

What is the maximum number of isomers pentane (C₅H₁₂) can have?

A
4

B
3

C
2

D
6

Solution

The maximum number of isomers that pentane (C₅H₁₂) can have is three.
Question 7
1 / -0

Isomer of dimethyl ether is

A
methanol

B
ethanol

C
diethyl ether

D
ethane

Solution

Ethanol is the isomer of dimethyl ether.
Question 8
1 / -0

The name of the compound CH₃ CH₂ CH₂OH is

A
methyl alcohol

B
n-propyl alcohol

C
ethanoic acid

D
ethanol

Solution

The name of the compound CH₃ CH₂ CH₂OH is n-propyl alcohol.
Question 9
1 / -0

Which of the following is produced on heating ethyl alcohol with alumina at 350^oC?

A
Ethanal

B
Diethyl ether

C
Ethene

D
Ethyne

Solution

Ethyl alcohol heated at 350^oC in the presence of alumina catalyst undergoes dehydration to produce ethene (ethylene).
Question 10
1 / -0

Acetic acid reacts with PCl₅ or SOCl₂ to give

A
acetyl chloride

B
dichloro acetic acid

C
methyl chloride

D
ethanol

Solution

Acetic acid reacts with PCl₅ or SOCl₂ to give acetyl chloride.
Question 11
1 / -0

Carbon does not directly react with

A
steam

B
metal oxides

C
carbon dioxide

D
chlorine

Solution

Carbon does not react directly with chlorine, because the C-C bond is more stable than the C-Cl bond.
But organic compounds containing chlorine atoms are prepared indirectly.

e.g. CH₄(g) + Cl₂(g) CH₃Cl(g) + HCl(g)
Question 12
1 / -0

Which of the following reactions takes place when ethanol undergoes combustion?

A
CH₃CH₂OH + O₂ CO₂ + H₂O

B
CH₃CH₂OH + O₂ CH₂OCH₂ + H₂O

C
CH₃CH₂OH + O₂ CH₄ + CO₂

D
CH₃CH₂OH + O₂ CH₃COOH

Solution

When ethanol undergoes combustion, the following reaction takes place:
CH₃CH₂OH + O₂ CO₂ + H₂O
Question 13
1 / -0

Which type of reaction takes place in the following reaction?

CH₃ – CH₂OH CH₃COOH

A
Substitution reaction

B
Oxidation reaction

C
Displacement reaction

D
Decomposition reaction

Solution

Potassium permanganate is a strong oxidising agent. Thus, the given reaction is an oxidation reaction.
Question 14
1 / -0

Which of the following is used as a catalyst to obtain saturated hydrocarbons from unsaturated hydrocarbons?

A
Palladium

B
Silicon

C
Hydrogen

D
Chlorine

Solution

Palladium is used as a catalyst to obtain saturated hydrocarbons from unsaturated hydrocarbons.
Question 15
1 / -0

Which of the following organic compounds will not undergo an additional reaction?

A
C₂H₄

B
C₂H₂

C
C₆H₆

D
CH₄

Solution

CH₄ will not undergo an additional reaction because saturated hydrocarbon does not show addition reaction.
Question 16
1 / -0

Which of the following products will be formed when propene undergoes addition reaction in the presence of catalyst?

A
C₃H₅OH

B
C₃H₈

C
C₃H₄

D
C₄H₈

Solution

C₃H₈ will be formed when propene undergoes addition reaction in the presence of catalyst, because propene is an alkene and alkenes show addition reactions.
Question 17
1 / -0

Which of the following is the most reactive?

A
Alkane

B
Alkene

C
Alkyne

D
Aryl

Solution

Alkynes are the most reactive among all three types of hydrocarbons.
Question 18
1 / -0

Which of the following correctly represents a reaction of ethanol with sodium?

A
Na + CH₃CH₂OH CH₂ = CH₂+ NaOH

B
Na + CH₃CH₂OH CH₃CH₂O^–Na⁺ + H₂

C
Na + CH₃CH₂OH 2 CH₄ + NaOH

D
Na + CH₃CH₂OH CH₃CHONa + H₂

Solution

Ethanol reacts with sodium to form sodium ethoxide and hydrogen.
Question 19
1 / -0

Which of the following acts as a dehydrating agent that removes water from ethanol?

A
Conc. H₂SO₄

B
Conc. HNO₃

C
Dil. HCl

D
Dil. HNO₃

Solution

Concentrated H₂SO₄ acts as a dehydrating agent that removes water from ethanol.
Question 20
1 / -0

The functional group present in terylene is

A
carboxylic acid

B
alcohol

C
ester

D
none of these

Solution

The functional group present in terylene is ester.