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Functional Group Analysis, Reactions and Mechanisms

Total questions: 24

Worksheet time: 35mins

Name
Class
Date
1.

What type of chemical reaction is this:

C3H8 + Br2 ⟶ C3H7CBr + HBr

a)

Incomplete combustion

b)

Hydrogenation

c)

Complete combustion

d)

Free radical substitution

2.

Which of the following is true about incomplete combustion?

a)

It takes place because there is too much fuel

b)

It takes place because there is not enough supply of air

c)

The products are soot and hydrocarbons

d)

The products are hydrogen and water

3.

Give the name of reaction, when alkanes react with bromine in the presence of UV.

a)

Hydrogenation

b)

Halogenation

c)

Hydration

d)

Hydrohalogenation

4.

What is the name of this step?

a)

Termination Step

b)

Propagation Step

c)

Initiation Step

d)

Cleavage Step

5.

The skeletal formula for CH3CH2CH2CH3 is ….

a)
b)
c)
d)
6.
Which is an unsaturated hydrocarbon?
a)
C2H6
b)
C3H8
c)
C4H8
7.

Which of the following is obtained when the compound below is heated with acidified KMnO4?

a)
b)
c)
d)
8.
Can alkanes undergo reactions? 
a)
Yes, they can undergo substitution reactions like halogenation
b)
No, they cannot undergo any reactions
c)
No, the stable molecules do not like to react
d)
Yes, they undergo hydrogenation
9.
What colour does bromine water turn in the presence of an alkene
a)
Orange
b)
Blue
c)
Colourless
d)
Green
10.

What is the observation obtained when alkene react with acidified KMnO4

a)

decolourize purple solution

b)

decolourize reddish brown solution

c)

decolourize blue solution

d)

yellow precipitate formed

11.

what is the name of the reaction when alkenes react with HCl?

a)

Hydrogenation

b)

Halogenation

c)

Hydrohalogenation

d)

Hydration

12.

Aromatic compounds usually undergo which type of reaction?

a)

Electrophilic substitution reaction

b)

Electrophilic addition reaction

c)

Nucleophilic substitution reaction

d)

Nucleophilic addition reaction

13.
Can alkanes undergo reactions? 
a)
Yes, they can undergo substitution reactions like halogenation
b)
No, they cannot undergo any reactions
c)
No, the stable molecules do not like to react
d)
Yes, they undergo hydrogenation
14.

What is the observation obtained when alkene react with acidified KMnO4

a)

decolourize purple solution

b)

decolourize reddish brown solution

c)

decolourize blue solution

d)

yellow precipitate formed

15.

what is the name of the reaction when alkenes react with HCl?

a)

Hydrogenation

b)

Halogenation

c)

Hydrohalogenation

d)

Hydration

16.

Aromatic compounds usually undergo which type of reaction?

a)

Electrophilic substitution reaction

b)

Electrophilic addition reaction

c)

Nucleophilic substitution reaction

d)

Nucleophilic addition reaction

17.

the major product when 2-pentanol react with concentrated sulphuric acid in 140oC is

a)

1-pentyne

b)

2-pentene

c)

dimethylacetylene

d)

but-2-yne

18.

What does the o in o-Xylene means?

a)

ortho

b)

one

c)

opposite

d)

Original

19.

On heating compound X with acidified KMnO4, compound Y is obtained. Compound Y does not react with Fehling’s solution. X and Y are most likely to be,


Compound X Compound Y

a)

CH3COCH3 CH3COOH

b)

CH3CH(OH)CH3 CH3COCH3

c)

CH3CH2CH2OH CH3COCH3

d)

CH3CH2CH2OH CH3CH2CHO

20.

Acetone reacts with HCN to form a cyanohydrin. It is an example of

a)

Electrophilic addition

b)

Electrophilic substituition

c)

Nucleophilic addition

d)

Nucleophilic substituition

21.
Aldehyde reacts with Tollen's reagent forming:
a)
Yellow precipitate
b)
Brick-red precipitate
c)
Purple solution
d)
Silver mirror
22.

1. Iodoform test: Yellow precipitate

2. Tollens' test: No observable change

3. 2,4-DNPH: yellow precipitate

Which compound will have the above observations?

a)

CH3CH2CHO

b)

C6H5CHO

c)

CH3CH2COCH3

d)

CH3COOH

23.

Which statement about butanone is correct?

a)

Butanone reacts to form silver mirror with Tollen's Reagent

b)

Butanone can be prepared by reduction of 1-butanol

c)

Butanone forms brick red precipitate with Fehling’s solution

d)

Butanone's C=O bond is polar with O δ–

24.

Aldehydes and ketones form hydrazone with which of the following reagent

a)

Semicarbazide

b)

2,4-dinitro Phenylhydrazine

c)

Hydroxylamine

d)

None

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