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Why is tetraethyllead [(C2H5)4Pb,TEL] s...

Why is tetraethyllead [`(C_2H_5)_4`Pb,TEL] sometimes added to gasoline ?

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In aviation gasoline of 100 octane number, 1.0 mL of tetraethy lead (TEL), (C_(2)H_(5))_(4) Pb , of density 1.615 g mL^(-1) , per litre is added to the product. TEL is prepared as follows: 4C_(2) H_(5) Cl + 4Na(Pb) rarr (C_(2)H_(5))_(4) Pb + 4NaCl + 3 Pb Calculate the amount of C_(2) H_(5) Cl required to make enough TEL for 1.0 L of gasoline.

In aviation gasoline of 100 octane number, 1.0 mL of tetraethy lead (TEL), (C_(2)H_(5))_(4) Pb , of density 1.615 g mL^(-1) , per litre is added to the product. TEL is prepared as follows: 4C_(2) H_(5) Cl + 4Na(Pb) rarr (C_(2)H_(5))_(4) Pb + 4NaCl + 3 Pb Calculate the amount of C_(2) H_(5) Cl required to make enough TEL for 1.0 L of gasoline.

Why does sugar turn black when concentrated H_2SO_4 is added to it?

(a) Give the products of the following reactions : (c) The reaction of C_2 H_5 OH with NaBr in the presence of H_2 S O_4 is slow, but when trimethy1 sily1 chloride (Me_3 SiC1) is added to it, reaction proceeds very fast. Why ?