In which of the following substances is the carbon atom arranged in a regular tetrahedral structure?

In the Fischer-Tropsch synthesis of petrol,$.....$ and $.....$ are used as the raw materials.

Different hydrogen atoms in the compound $CH_3-CH=CH-CH_2-CH_2-CH(CH_3)_2$ are represented by alphabets $A, B, C, D, E, F$. Arrange them in decreasing order of reactivity towards free radical substitution.

If a mixture of methyl iodide and ethyl iodide in equal proportions is treated with metallic sodium in dry ether,the number of possible products obtained will be ....................

The general formulas for alkene and alkane are respectively:

Which of the following has the highest boiling point?