Consider the following statements: Chlorofluorocarbons, known as ozone-depleting substances, are used<br/>1. In the production of plastic foams.<br/>2. In the production of tubeless tyres.<br/>3. In cleaning certain electronic components.<br/>4. As pressurizing agents in aerosol cans.<br/><br/>Which of the statements given above is/are correct?

1. In the production of plastic foams — Correct. CFCs were widely used as blowing agents in foam plastics like polyurethane and polystyrene.

2. In the production of tubeless tyres — Incorrect. Tubeless tyres are not a standard/use-defining application of CFCs; this is not a recognized major use of ozone-depleting CFCs.

3. In cleaning certain electronic components — Correct. CFCs were used as solvents for precision cleaning in electronics and metal-degreasing.

4. As pressurizing agents in aerosol cans — Correct. CFCs were commonly used as propellants in aerosol sprays.

So, statements 1, 3 and 4 are correct.