Full formScience
TELstands forTetraethyl Lead
Full Form of TEL
What is TEL?
Tetraethyl Lead (TEL) is an organolead compound with the chemical formula Pb(C2H5)4 that was historically used as an anti-knock additive in petrol and aviation gasoline. It is a colourless, oily, and sweet-smelling liquid that was blended with fuel from the 1920s onwards to raise octane ratings and prevent engine knocking in motor vehicles. In India, TEL was added to petrol distributed by Indian Oil Corporation, Bharat Petroleum, and Hindustan Petroleum for several decades, becoming a staple of the Indian automobile ecosystem. However, mounting evidence of lead poisoning, neurological damage, and severe air pollution prompted global action against leaded fuel. India officially banned the use of Tetraethyl Lead in petrol on 1 February 2000, becoming one of the earliest developing countries to make the transition to unleaded fuel. The phase-out had significant public health benefits, especially for children in polluted cities like Delhi, Mumbai, and Kolkata. TEL is regularly covered in chemistry, environmental science, and petroleum engineering courses in Indian universities and appears in competitive exams such as UPSC, SSC, and state PSC question papers.
TEL का फुल फॉर्म
टेट्राएथिल लेड
Example
India officially phased out Tetraethyl Lead from petrol in February 2000, making it one of the first developing nations to adopt unleaded fuel on a national scale.
TEL — frequently asked questions
What is the full form of TEL?
TEL stands for Tetraethyl Lead, an organolead compound historically used as an anti-knock additive in petrol.
Why was Tetraethyl Lead added to petrol?
TEL was blended with petrol to raise its octane rating and prevent engine knocking, allowing smoother combustion in vehicles.
When did India ban Tetraethyl Lead in petrol?
India officially banned the use of Tetraethyl Lead in petrol on 1 February 2000, becoming one of the first developing countries to phase out leaded fuel.