During the reaction of molecular bromine with 2,2,3-trimethyl pentane initiated by heat or light hydrogen atom will be abstracted from select one:

a. either carbon of the two methyl groups at position 2
b. carbon number 2 of the parent chain
c. carbon number 5 of the parent chain
d. carbon number 3 of the parent chain
e. carbon number 4 of the parent chain
f. carbon number 1 of the parent chain
g. carbon of the methyl groups at posit

carbon number 3 of the parent chain

Explanation:

CH3CH2CH(CH3)C(CH3)2CH3.

Looking at the structural formula of the above compound, the carbon on position 3, in the parent chain is a tertiary carbon atom. The reaction in question proceeds by free radical mechanism. Hydrogen is first abstracted from the carbon atom that leads to te formation of the most stable carbocation. For this reason, hydrogen is abstracted from carbon 3 of the parent chain.