Match List-I (Industrial process) with List-II (Industry with which associated) and select the correct answer using the codes given below the lists:
| List-I | List-II |
| A. Cracking | 1. Rubber |
| B. Smelting | 2. Petroleum |
| C. Hydrogenation | 3. Copper |
| D. Vulcanization | 4. Edible fats |
Codes:
(a) A-3; B-2; C-1; D-4
(b) A-2; B-3; C-4; D-1
(c) A-2; B-3; C-1; D-4
(d) A-3; B-2; C-4; D-1
(b) Cracking is the process whereby complex organic molecules such as kerosene or heavy hydrocarbons are broken down into simpler molecules such as light hydrocarbons, by the breaking of carbon-carbon bonds.
Smelting is a form of extractive metallurgy; its main use is to produce a metal from its ore. In this process the oxide ore is reduced to free metal by using reducing agents like coke or charcoal. Copper is also obtained from its oxide by this method in free state.
Hydrogenation is a reduction reaction which results in an addition of hydrogen (usually as H2). If an organic compound is hydrogenated, it becomes more 'saturated'. Hydrogenation results in the conversion of liquid vegetable oils to solid (edible) fats.
Vulcanization is a chemical process for converting rubber into more durable materials via the addition of sulphur. Sulphur modify the rubber by forming crosslinks (bridges) between individual polymer chains. Vulcanized material is less sticky and has superior mechanical properties.