CBSE Class 12 Chemistry II - Practice Test
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  3. CBSE Class 12 Chemistry II
CBSE Class 12 Chemistry II

CBSE Class 12 Chemistry II - Practice Test

Complete mock test covering Organic Chemistry, Biomolecules, and Coordination Compounds. Includes reaction mechanisms, structural analysis, and chemical synthesis.

2025-07-19
Pavan Pavan
CBSE Class 12 Chemistry Grade 12

Duration

30 min

Questions

27

Marking

Negative

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Questions Preview

What is the primary class of compounds discussed in the document?

A
Haloalkanes and Haloarenes
B
Alkyl halides
C
Aromatic hydrocarbons
D
Aliphatic hydrocarbons

What is the primary method of preparation for alkyl halides mentioned in the document?

A
Electrophilic substitution
B
Free radical halogenation
C
Hydrolysis
D
Aldol condensation

What effect does the presence of a nitro group at the ortho- and para-positions of haloarenes have?

A
Increases the reactivity towards nucleophilic substitution
B
Decreases the reactivity towards nucleophilic substitution
C
No effect on reactivity
D
Makes haloarenes less polar

Which of the following methods is best for preparing alkyl fluorides?

A
Heating alkyl chloride/bromide with a metallic fluoride
B
Electrophilic substitution
C
Halogen exchange
D
Radical halogenation

What is the major product formed when a haloalkane undergoes nucleophilic substitution with hydroxide ion?

A
Alcohol
B
Alkene
C
Alkyl halide
D
Ether

What is the preferred condition for performing an S_N2 reaction with alkyl halides?

A
Polar protic solvent
B
Polar aprotic solvent
C
Non-polar solvent
D
Solvent-free

Which of the following is the most reactive alkyl halide towards nucleophilic substitution?

A
Tertiary alkyl halides
B
Secondary alkyl halides
C
Primary alkyl halides
D
Allylic halides

What happens when an alkyl halide undergoes nucleophilic substitution via the S_N1 mechanism?

A
Racemization of the product
B
Inversion of configuration
C
No change in configuration
D
Formation of a planar intermediate

Which of the following halogen compounds is most likely to undergo an S_N2 reaction?

A
Methyl bromide
B
Tert-butyl chloride
C
Allyl chloride
D
Vinyl iodide

In which reaction are polyhalogen compounds particularly useful?

A
Refrigeration
B
Nucleophilic substitution
C
Hydrolysis
D
Electrophilic substitution

Which of the following statements is true about organohalogen compounds?

A
They are highly soluble in water
B
They are less stable than hydrocarbons
C
They tend to be more reactive than the corresponding hydrocarbons
D
They do not dissolve in organic solvents

What happens to the boiling point of alkyl halides compared to the corresponding hydrocarbons?

A
The boiling point of alkyl halides is lower
B
The boiling point of alkyl halides is the same
C
The boiling point of alkyl halides is higher
D
Boiling point does not depend on molecular weight

Which of the following is a major application of DDT?

A
Used as an insecticide
B
Used as a solvent in organic reactions
C
Used in the manufacture of refrigerants
D
Used in pharmaceuticals for cancer treatment

What effect does the presence of bulky substituents have on an S_N2 reaction?

A
It increases the rate of reaction
B
It decreases the rate of reaction
C
It has no effect on the reaction
D
It reverses the reaction mechanism

Which of the following is not a method of preparing haloalkanes?

A
Electrophilic substitution
B
Free radical halogenation
C
Reaction with sodium metal
D
Hydrolysis

Which compound undergoes nucleophilic substitution most readily?

A
1-Bromopropane
B
2-Bromopropane
C
tert-Butyl bromide
D
Allyl bromide

Which of the following compounds is an example of a polyhalogen compound?

A
Methylene chloride
B
Chloroform
C
Carbon tetrachloride
D
All of the above

Which of the following reactions forms alkyl halides from alcohols?

A
Electrophilic substitution
B
Dehydrohalogenation
C
Reaction with phosphorus halides
D
Reaction with sodium metal

What is the key feature of nucleophilic substitution reactions?

A
Electron-rich species replace leaving groups
B
Electron-poor species replace leaving groups
C
A new bond is formed between two leaving groups
D
A new bond is formed between an electrophile and a nucleophile

Which of the following compounds undergoes the fastest electrophilic substitution?

A
Chlorobenzene
B
Benzene
C
Phenol
D
Toluene

What is the major product of dehydrohalogenation of 2-Bromo-2-methylbutane?

A
But-2-ene
B
But-1-ene
C
2-Methylbut-1-ene
D
2-Methylbut-2-ene

Which halogenated compound is most likely to undergo the Swarts reaction?

A
Alkyl chlorides
B
Alkyl bromides
C
Alkyl iodides
D
Alkyl fluorides

Which of the following is a key characteristic of haloalkanes?

A
They are polar compounds
B
They are non-polar compounds
C
They are highly reactive with water
D
They do not form hydrogen bonds

Which of the following solvents is commonly used in the synthesis of alkyl fluorides?

A
Acetone
B
Ether
C
Water
D
Alcohol

What is the primary role of Grignard reagents in organic reactions?

A
Act as a nucleophile in substitution reactions
B
Act as a base in elimination reactions
C
Act as a catalyst in electrophilic substitution reactions
D
Act as a proton donor in acid-base reactions

Which of the following products is formed when a haloalkane reacts with NaI in dry acetone?

A
Alkyl iodide
B
Alkyl bromide
C
Alkyl fluoride
D
Alkyl chloride

Which of the following halides will undergo the fastest nucleophilic substitution reaction?

A
Methyl iodide
B
Ethyl chloride
C
Tert-butyl chloride
D
Benzyl bromide