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Chemistry Unit-9 Test

Total questions: 40

Worksheet time: 3600secs

Name
Class
Date
1.

Experiments show that order of reactivity of alkyl halides is determined by the

a)

Strength of carbon halogen bond

b)

Bond polarity of carbon halogen bond

c)

Bond energy of carbon hydrogen bond

d)

Neither B nor C

2.

2-Chlorobutane on reacting with alcoholic KOH gives:

a)

But-1 -ene

b)

But-2 -ene

c)

Butan-1 -ol

d)

Butan-2-ol

3.

Consider the following structure:

Which of the following is the correct name according to IUPAC?

a)

2-Bromo-3,4-dimethylpentane

b)

5-Bromo-3,4-dimethylpentane

c)

2,3-Dimethyl-5-bromopentane

d)

1 -Bromo-2,3,4-dimethylbutane

4.

Alkyl halides are considered to be very reactive compounds towards nucleophiles because:

a)

They have an electrophilic carbon

b)

They have an electrophilic carbon and a good leaving group

c)

They have a nucleophilic carbon and a good leaving group

d)

They have an electrophilic carbon and bad leaving group

5.

Consider the following structure of alkyl halide:

The correct IUPAC name of the given structure is:

a)

5-Chloro-3-ethylhexane

b)

2-Chloro-3-ethylhexane

c)

3-Ethyl-5-chlorohexane

d)

2-Chloro-4-ethylhexane

6.

Which of the following is correct order of ease of SNI reaction shown by alkyl halide?

a)

(R)2CHX > CH3X > (R)3C-X > RCH2X

b)

CH3X > RCH2X > (R)2CHX > (R)3C-X

c)

(R)2CHX > (R)3C-X > RCH2X > CH3X

d)

(R)3C-X > (R)2CHX > RCH2X > CH3X

7.

During SN1 mechanism, change in state of hybridization of carbon atom in first

a)

sp3 to sp2

b)

sp3 to sp

c)

sp2 to sp3

d)

Sp2 to sp

8.

The mechanism involved in the given reaction is

a)

SN1 reaction

b)

SN2 reaction

c)

E1 reaction

d)

E2 reaction

9.

CN- attacks on which alkyl halide to give propane nitrile?

a)

Propyl Chloride

b)

Iso-propyl chloride

c)

Bromobutane

d)

Chloroethane

10.

If OH- attacks on electrophilic carbon atom of alkyl halide, the product is _____ and if it attacks on β – hydrogen the product is ________.

a)

Alkanol, alkene

b)

Ether, alkene

c)

Alkene, Alkanone

d)

Alkane, Aldehyde

11.

First step involves attack of base on alpha hydrogen in

a)

SN1 and SN2

b)

E1 and E2

c)

SN1 and E1

d)

E-2 only

12.

In which substitution mechanism of alkyl halides the attacking nucleophile

experiences no hindrance from leaving group

a)

SN1

b)

SN2

c)

E1

d)

Both A and C

13.

CnH2n+2O is the general formula of

a)

Alkanol and ethers

b)

Alcohols and glycols

c)

Alcohols and Phenols

d)

Glycols and Glycerols

14.

Hydroxy derivatives of paraffins are

a)

Ethers

b)

Alkanone

c)

Alcohols

d)

Phenol

15.

In the reaction of alcohol, if the intermediate forms is a carbocation, this means that

a)

Alcohols is reacting with Na

b)

Alcohol is reacting with acetic acid

c)

Alcohol ionizes as carbocation and OH-ion in water

d)

C – O bond of alcohol breaks

16.

Ethers can be obtained from alcohols by which type of reaction.

a)

Oxidation

b)

Esterification

c)

Dehydration

d)

Dehydrogenation

17.

Due to involvement of negative charge of oxygen in the ring of benzene

a)

Phenoxide ion attains stability

b)

Four resonating structures form

c)

pH of its solution becomes less than 4

d)

Reactivity of phenol increases

18.

The order of reactivity of alcohols when alcohol reacts with ammonia in the

presence of ThO2

a)

1° Alcohol > 2° Alcohol > 3° Alcohol > CH3OH

b)

3° Alcohol > 2° Alcohol > 1° Alcohol

c)

CH3OH > 1° Alcohol > 2° Alcohol > 3° Alcohol

d)

1° Alcohol > 3° Alcohol > 2° Alcohol

19.

Phenol on reaction with concentrated nitric acid produces ________ involving ________ mechanism

a)

ortho-nitrophenol , electrophilic substitution

b)

2,5-Dinitrophenol, Nucleophilic substitution

c)

2,4,6-Trinitrophenol, Electrophilic substitution

d)

2,4,6-Trinitrophenol, Electrophilic addition

20.

Which pair is incorrectly matched?

a)

Iso-Propyl alcohol, Secondary alcohol

b)

Propanol, Primary alcohol

c)

Iso-Butyl alcohol, Secondary alcohol

d)

Neopentyl alcohol, primary alcohol

21.

When aliphatic aldehyde is treated with Fehling’s solution, a brick-red precipitate is

formed in this reaction oxidation state of coper changes from________ to ________

a)

II, I

b)

II, III

c)

I, II

d)

III, II

22.

Which of the following reagent reacts with both aldehydes and ketones

a)

Tollen’s reagent

b)

Fehling’ solution

c)

Benedict’ solution

d)

Grignard’s reagent

23.

3,3-Dimethyl-1-butanol on oxidation gives compound, which contains functional

group of

a)

3,3-Dimethyl-1-pentanal

b)

3,3-Dimethyl-1-Propanal

c)

3,3-Dimethyl butanal

d)

2,2-Dimethyl-1-butanol

24.

Why is it necessary to distill aldehyde formed from oxidation of primary alcohol

through acidified potassium dichromate (VI) solution or acidified sodium

dichromate (VI) solution?

a)

Aldehyde formed is unstable and decompose back to original precursor i.e. primary alcohol

b)

Aldehyde formed may react with primary alcohol, the original reactant

c)

Aldehyde may be oxidized further to a ketone

d)

Aldehyde formed may be oxidized further to carboxylic acid

25.

Which of the following is the strongest reducing agent

a)

C6H5CHO

b)

HCHO

c)

CH3CHO

d)

CH3CH2CHO

26.

OH- act as nucleophile when reacts with

a)

Formaldehyde

b)

Benzaldehyde

c)

Trimethylacetaldehyde

d)

All of these

27.

Point out the one that does not react with a saturated aqueous solution of sodium

bisulphite to form a crystalline solid

a)

Butanone

b)

Ethanal

c)

Acetone

d)

Ethanol

28.

The base added in reaction mixture when Ethanal combines with HCN(in-situ),

facilitates the nucleophilic addition reaction by

a)

Increasing nucleophilic character of Carbonyl group

b)

Increasing electrophilic character of Carbonyl group

c)

Increasing electrophilic character of Nucleophilic reagent

d)

Generating CN- which is stronger nucleophile than HCN itself

29.

Reaction of 2-chloro-2-methyl Butane with KCN in the presence of alc.KOH follows

a)

SN1– mechanism

b)

E1– mechanism

c)

SN2 – mechanism

d)

E2 – mechanism

30.

In SN2 reaction the percentage of retention in configuration in the product is

a)

0%

b)

100%

c)

75%

d)

50%

31.

Iso propyl chloride undergoes hydrolysis by the mechanism

a)

SN2

b)

SN1

c)

Either SN1 or SN2

d)

Neither SN1 or SN2

32.

Identify the organic compound that undergoes oxidation more easily

a)

Aldehydes

b)

Acids

c)

Ketones

d)

Ethers

33.

Identify which of the following is incorrect about phenol

a)

Phenol is poisonous crystalline solid

b)

It usually exist as yellow crystalline solid

c)

Phenol is a deliquescent solid

d)

It is sparingly soluble in water forming pink solution

34.

Which pair of carbonyl compound can be distinguished by Iodoform test

a)

Acetone, 2-Pentanone

b)

2-Pentanone, Butanone

c)

Methanal, Propanal

d)

Acetone , 3-Pentanone

35.

Oxidation of unknown compound in the presence of KMnO4 / H2SO4 produces

ethanoic acid and propanoic acid. Identify the carbonyl compound

a)

Acetone

b)

Butanone

c)

2-Pentanone

d)

Ethanal

36.

Alcohol reacts with the following reagents, which one gives nucleophilic substitution reaction?

a)

Ammonia and thorium oxide

b)

Na metal

c)

CH3 Mg I

d)

CH3 COOH

37.

The reaction of acetone with HCN is the example of ________ reaction

a)

Nucleophilic addition

b)

Nucleophilic substitution

c)

Electrophilic addition

d)

Addition – elimination reaction

38.

Which one of the following has only sp2 hybridized carbon

a)

CH3COCH3

b)

CH3OH

c)

CH3COH

d)

HCOH

39.

An organic compound P when treated with NaBH4 forms Q. if Q is ethanol than

what is P?

a)

Methanal

b)

Acetone

c)

Methanol

d)

Ethanal

40.

Propanone reacts with HCN in basic medium followed by acid hydrolysis yielding

a)

Lactic acid

b)

2-hydroxy-2-methyl propanoic acid

c)

2-hydroxy ethanoic acid

d)

2-hydroxy butanoic acid

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