thefunword.com – MCQs, Mock Tests | IIT JEE IIT JEE Chemistry Of Hydrocarbons Part 1

Olafins means

1. ethene
2. unsaturated
3. oil forming
4. having tripple bond

✅ Correct Answer: 3

Which of the following has dipole moment?

1. trans-2-butene
2. 1-propene
3. cis-2-butene
4. Both A and B

✅ Correct Answer: 4

In which of the following C-H bond will be smallest?

1. Ethylene
2. Acetylene
3. Methane
4. Ethane

✅ Correct Answer: 2

Alkynes when reduced with sodium in liquid ammonia gives

1. 1-alkene only
2. a mixture of cis and trans
3. alkenes
4. None of them

✅ Correct Answer: 1

12-butyne when reduced with palladised charcoal with poisons like quinoline gives

1. 1-butene
2. butane
3. trans-2 butene
4. cis 2-butene

✅ Correct Answer: 5

Vapours of ethyl alcohol when passed over phosphoric acid at 220 degreeCentigrade gives

1. diethyl phosphate
2. methylene
3. ethyl hydrogen phosphate
4. ethylene

✅ Correct Answer: 4

Which of the following have maximum boiling point?

1. n-pentane
2. isopentane
3. isohexane
4. n-hexane

✅ Correct Answer: 4

The reactivity of a hydrogen in an alkane depends on carbon atoms

1. conditions
2. carbon atoms
3. the alkane in which it is present
4. whether the hydrogen is primary secondary or tertiary

✅ Correct Answer: 4

The addition reaction of carbon-carbon double bonds are free radical addition None of the above

1. nucleophilic addition
2. free radical addition
3. electrophilic addition
4. None of the above

✅ Correct Answer: 3

With the increase in branching the boiling point

1. decreases
2. increases
3. no regular gradation
4. remains constant

✅ Correct Answer: 1

Which of the following has minimum boiling point? isopentane both A and B

1. isopentane
2. neopentane
3. n-pentane
4. both A and B

✅ Correct Answer: 2

Which of the following will show maximum possible isomers?

1. Pentene
2. Pentane
3. Butane
4. Butene

✅ Correct Answer: 1

Propane when treated with conc. Nitric acid at 723 K gives

1. 2-nitropropane
2. 1-nitropropane
3. a mixture of nitromethane nitroethane 1-
4. a mixture of nitromethane nitroethane 1-nitropropane and 2-nitropropane nitroethane and nitromethane

✅ Correct Answer: 3

Vapours of n-hexane when passed over special catalysts under high pressure and temperature given benzene This process is called

1. cyclisation
2. aromatisation
3. isomerisation
4. crystallization

✅ Correct Answer: 2

Which of the following can form metallic derivatives by the replacement of hydrogen atoms? Ethylene

1. Ethylene
2. Acetylene
3. Ethane
4. Methane

✅ Correct Answer: 2

Alkenes are isomeric with

1. cycloalkenes
2. cycloalkanes
3. alkanes
4. alkenes

✅ Correct Answer: 1

The higher fraction of crude oil burn with pinkish flame

1. smokiest flame
2. pinkish flame
3. blue flame
4. red flame

✅ Correct Answer: 1

Which of the following alkanes will undergo oxidation readily?

1. ethane
2. iso-butane
3. iso-pentane
4. 2 methyl propane

✅ Correct Answer: 4

A mixture of 1-chloropropane and 2-chloropropane is treated with alcoholic KOH. The resulting mixture will have

1. 1-propene
2. 2-propene
3. 1-propanol
4. a mixture of 1-propene and 2-propene

✅ Correct Answer: 1

On ozonolysis and subsequent hydrolysis an alkene gave 2 molecules of formaldehyde and hydrogen peroxide. The alkene is

1. ethylene
2. butylene
3. propylene
4. None of these

✅ Correct Answer: 1

Wurtz reaction cannot be used for the preparation of

1. alkanes containing odd no. of C-atoms
2. alkanes containing even no. of C-atoms
3. methane
4. both methane and odd no. of C-atoms

✅ Correct Answer: 4

Ethylene when treated with bromine water gives

1. ethyledene bromide
2. ethylene bromohydrin
3. ethylene bromide
4. methanol

✅ Correct Answer: 2

Bromination of isobutene gives as major product

1. n-butyl bromide
2. tert. butyl bromide
3. isobutyl bromide
4. None of the above

✅ Correct Answer: 2

Among the alkanes with an increase in mol wt??.

1. m.pt. decreases
2. f.pt. decreases
3. b.pt increases
4. density decreases

✅ Correct Answer: 3

Alkyl halides gives alkenes when treated with

1. alc KOH
2. aq KOH
3. molten KOH
4. All the above

✅ Correct Answer: 1

Tetraethyl lead is used as

1. petroleum additive
2. ethylating agent
3. antrepeller
4. catalyst

✅ Correct Answer: 1

isomers of butyl chloride which will undergo dehydrogenation more readily

1. Among the different
2. tert. butyl chloride
3. sec. butyl chloride
4. n-butyl chloride

✅ Correct Answer: 1

The least substituted alkene is the major product in accordance with

1. Vant Hoff rule
2. Wurtz reaction
3. Markounikoffs rule
4. Hoffmanns rule

✅ Correct Answer: 4

Alcohholic solution of caustic potash is a specific reagent for

1. Dehydration
2. Dehydrohalogenation
3. Dehydrogenation
4. Hydration.

✅ Correct Answer: 2

An example of conjugate diene is

1. hexadiene 1 5
2. butadiene 1 2
3. butadiene 1 3
4. pentadiene 1 4

✅ Correct Answer: 3

Octane number of iso-octane is

1. Zero
2. 100
3. 80
4. 20

✅ Correct Answer: 2

In ethane each carbon atom is bonded to

1. 4 atoms
2. 2atoms
3. 3 atoms
4. 5 atoms

✅ Correct Answer: 1

When two alkenes may be formed by dehydrohalogenation of an alkyl halide the alkene which is more substituted is the major or preferred product. This generalisation is known as .

1. Markownikoffs rule
2. Anti-Markownikoffs rule
3. Saytzeff rule
4. None of these is correct

✅ Correct Answer: 3

To increase the yield of gasoline from a given sample of crude oil the chemist carries out

1. Fractiomal distillatiom
2. Hydrolysis
3. Aromatization
4. Cracking.

✅ Correct Answer: 4

Polythene is a polymer of

1. ethylene
2. propylene
3. isobutene
4. vinyl chloride

✅ Correct Answer: 1

Dehydrohalogenation of alkyl dihalides gives

1. alkyl halides
2. alkynes
3. alkenes
4. alkanes

✅ Correct Answer: 2

The formation of PVC from vinyl chloride is an example of

1. condensation polymerisation
2. addition polymerisation
3. substitution reaction
4. None of these

✅ Correct Answer: 2

Cetane is

1. n-Hexane
2. n-Octane
3. n-Pentadecane
4. n-Hexadecane.

✅ Correct Answer: 4

Iodoform can be prepared in the laboratory by the action of iodine on sodium hydroxide in the presence of

1. formaldehyde
2. acetaldehyde
3. acetic acid
4. formic acid

✅ Correct Answer: 2

Crude oil is a complex mixture of

1. acids
2. alcohols
3. hydrocarbons
4. esters

✅ Correct Answer: 3

The number of isomeric pentanes is

1. 4
2. 3
3. 2
4. 1

✅ Correct Answer: 2

During distillation of coal tar naphthalene is a constituent of

1. Middle oil
2. Green oil
3. Light oil
4. Heavy oil.

✅ Correct Answer: 1

Alcoholic solution of caustic potash is a specific reagent for

1. dehydro-halogenation
2. dehydrogenation
3. dehydration
4. hydration

✅ Correct Answer: 1

Aromatisation is the conversion of

1. higher hydrocarbon to lower ones
2. mixing of aromatic hydrocarbon
3. a hydrocarbon to benzene
4. None of above

✅ Correct Answer: 3

Sodium propionate on decarboxylation with soda-lime gives

1. Propane
2. Ethane
3. Butane
4. Pentane.

✅ Correct Answer: 2

Acetylene can be converted into methyl vinyl ether on reaction with

1. Vinyl alcohol
2. Methyl alcohol
3. Dimethyl ether
4. Methanal.

✅ Correct Answer: 2

A mixture of sodium butanoate and 2-methyl sodium propanoate is heated with sodalime. The resulting compound will be

1. propane and propyne
2. a mixture of propane and 2-methyl propane
3. methane
4. propane

✅ Correct Answer: 4

The minimum temp. at which oil gives sufficient vapours to form an explosive mixture with air is known as

1. optimum temp.
2. kindling temp.
3. flash point
4. last point

✅ Correct Answer: 3

MCQs Practice Portal - thefunword.com

IIT JEE MCQ Quiz Hub

IIT JEE Chemistry Of Hydrocarbons Part 1