Alkanes are less reactive. Why?

Name the metal which is a constituent of Grignard's reagent.

During the pyrolysis of alkanes C-C bonds break in preference to C-H bond. Why?

Out of n-pentane, isopentane and neopentane which has lower boiling point?

Arrange the following compounds in order of their increasing boiling points:
n-Pentane, n-Hexane, Ethane, 2-2-Dimethylpentane, 2-Methylpentane.

Name the products formed when an ethereal solution containing ethyl iodide and methyl iodide is heated with sodium metal.

Define cracking. 

What is alternation effect?

What is the function of iodic acid in the iodination of alkanes? Can we use any other substance in its place?