Question

A single substitution of H atom in an alkane of molar mass by 72g / mole on chlorination produces only one product. The alkane is :

• A. n- pentane
• B. 2- methyl butane
• C. 2,2-dimethyl propane
• D. n- butane

Answer 1

The correct option is C 2,2-dimethyl propane

In 2,2-Dimethylpropane the central carbon atom is quaternary,
meaning all four of its valencies are satisfied by Carbon atoms; which
implies that there are no Hydrogen atoms which can be substituted by
Chlorine(or halogen), and all the remaining 4 carbon atoms are
identical, so substitution on any one of those will result in the same
compound.