Tag: petrochemicals and polymers

Questions Related to petrochemicals and polymers

Which of the following alkenes is most reactive towards cationic polymerization?

chemistry petrochemicals and polymers addition polymerisation types of polymerisation reactions polymer

  1. ${ CH } _{ 2 }$ = ${ CHCH } _{ 3 }$

  2. ${ CH } _{ 2 }$ = $CHCl$

  3. ${ CH } _{ 2 }$ = ${ CHC } _{ 6 }{ H } _{ 5 }$

  4. ${ CH } _{ 2 }$ = ${ CHCOOCH } _{ 3 }$

Show answer
Correct Option: C
Explanation:

In cationic polymerization the most stable cation will show the highest reactivity.

The order of reactivity will be-

$CH _2 = CH-C _6H _5 > CH _2  = CHCH _3 > CH _2 = CHCl >CH _2 = CHCOOCH _3$

Option C is correct.

Modern oil-based paints contain oils that can dry to form strong, adhesive films by cross-linking of fatty acid chains. Some of these drying oils' are mentioned here. Can you pick the false one?

chemistry petrochemicals and polymers food spoilage and food preservation methods of preserving food chemicals in food

  1. Linseed oil

  2. Turpentine oil

  3. Soyabean

  4. Castor oil

Show answer
Correct Option: B
Explanation:

Drying oils are prone to hardening upon exposure to air, due to free radical base polymerization, thus forming a flexible, transparent and waterproof film. This property is exhibited by linseed, turpentine and soybean oils. 

Stearic acid is.

chemistry petrochemicals and polymers food spoilage and food preservation methods of preserving food chemicals in food

  1. An unsaturated fatty acid

  2. A saturated fatty acid

  3. Essential fatty acid

  4. A simple lipid

Show answer
Correct Option: B

________ act as protective agent on the surface of animals and plants.

chemistry petrochemicals and polymers food spoilage and food preservation methods of preserving food chemicals in food

  1. Carbohydrates

  2. Vitamins

  3. Nucleic Acids

  4. Wax

Show answer
Correct Option: D
Explanation:

Wax act as a protective agent on the surface of animals and plants. It protects animals and plants from excessive loss of moisture. It protects the plants and fruits from becoming infected with fungi and bacteria.


Wax contains esters of long chain fatty acids and long chain alcohols or sterol.

Hence, option D is correct.

High molecular weight alcohols are present in:

chemistry petrochemicals and polymers food spoilage and food preservation methods of preserving food chemicals in food

  1. waxes

  2. fats

  3. oils

  4. phospholipids

Show answer
Correct Option: A
Explanation:

waxes are monoglycerides, these are form by the condensation reaction between monohydroxy alcohol and fatty acid, this is the high molecular weight compound.

Example- Bee wax 
( Hexacosyl palimitate $\rightarrow$ Hexacosyl alcohol+ Palmitic acid)
$C _{26}H _{53}OH + C _{15}H _{31}COOH \overset{-H _2O}\rightarrow C _{26}H _{53}COOC _{15}H _{31}$ 

Four oils $A, B, C$ and $D$ have the following values of melting points.
(a) $258$ K (b) $273$ K (c) $295$ K (d) $303$ K
Among these, which oil is prohibited from consumption by cardiac patients?

chemistry petrochemicals and polymers food spoilage and food preservation methods of preserving food chemicals in food

  1. a

  2. b

  3. c

  4. d

Show answer
Correct Option: D
Explanation:

The oils having higher unsaturation in the fatty acid component have very low melting points. Hence, on the consumption of these oils there is less chance of blockage of blood vessels. The saturated oils have higher melting points and they get solidified easily. Therefore they block the blood vessels and so are prohibited from consumption by cardiac patients. Hence oil D is prohibited from consumption by cardiac patients.

Which of the following is used as a solvent in dry cleaning?

chemistry petrochemicals and polymers petroleum properties of alkanes petroleum and natural gas rocks and minerals

  1. Water

  2. Paraffin wax

  3. Petrol

  4. Coal tar

Show answer
Correct Option: C
Explanation:

Dry cleaning means cleaning of tiles without using water or aqueous solvents. Petrol is used as a solvent in dry cleaning because it is highly vapourising organic solvent.

Which among the following is used to prepare detergents and plastics?

chemistry petrochemicals and polymers petroleum properties of alkanes petroleum and natural gas rocks and minerals

  1. Paraffin wax

  2. Bitumen

  3. Petrochemicals

  4. Lubricating oil

Show answer
Correct Option: C
Explanation:

Petrochemicals are the chemical compunds obtained from petroleum. They are used for making detergents, solvents, elastomers, lubricants, gels, polymers, plastics, fibres, adhesives etc

Petroleum is subjected to which of the following process in oil refineries to get petroleum products?

chemistry petrochemicals and polymers petroleum properties of alkanes petroleum and natural gas rocks and minerals

  1. combustion

  2. pyrolysis

  3. fractional distillation

  4. carbinization

Show answer
Correct Option: C
Explanation:

Refining is the process where seperation of various compounds of crude oil occurs. 


Fractional distillation is used for extracting different petroleum products like petrol, diesel, natural gas from petroleum in oil refineries.

Fuel for heavy motor vehicles is:

chemistry petrochemicals and polymers petroleum properties of alkanes petroleum and natural gas rocks and minerals

  1. petrol

  2. diesel

  3. coal tar

  4. kerosene

Show answer
Correct Option: B
Explanation:

Diesel engines have very high compression ratios. That is why it is used as a fuel for heavy motor vehicles.