Free radical chlorination of propane

Steps:

• Propane (C3H8) has formula CH3-CH2-CH3 with primary and secondary hydrogens.
• UV light generates Cl• radicals that abstract H, forming carbon radicals.
• Primary radical (CH3CH2CH2•) leads to CH3CH2CH2Cl via Cl2 reaction.
• Secondary radical (CH3CH•CH3) leads to CH3CHClCH3, but primary product is specified.

Why A is correct:

• CH3CH2CH2Cl forms by substitution at the terminal (primary) carbon, per the free radical mechanism where Cl replaces H.

Why the others are wrong:

• B: CH3CHClCH3 is the secondary substitution product, not the primary one expected.
• C: Identical to A, making it a duplicate choice, not distinct.
• D: Identical to B, a duplicate of the secondary product.

Final answer: A