The maximum number of structural isomers possible when one hydrogen atom in diphenyl methane is substituted by a chlorine atom is (a) 8 (b) 4 (c) 6 (d) 3

Diphenyl methane is composed of two phenyl rings (C6H5) connected by a single carbon atom, also known as a methane group (CH3). So, the overall structure of diphenyl methane is (C6H5)2CH.

There are four possible hydrogen atoms that can be substituted by a chlorine atom in diphenyl methane: one in the methane group and three at the ortho, meta, and para positions on each phenyl ring.

Now, by replacing a hydrogen atom at the identified positions with a chlorine atom, we create the following 6 unique structural isomers: 1. Chlorine substitution at the methane group: (C6H5)2CCl. 2. Chlorine substitution at the ortho position of one phenyl ring and hydrogen at all other positions: o-Cl(C6H4)C6H5CH2. 3. Chlorine substitution at the meta position of one phenyl ring and hydrogen at all other positions: m-Cl(C6H4)C6H5CH2. 4. Chlorine substitution at the para position of one phenyl ring and hydrogen at all other positions: p-Cl(C6H4)C6H5CH2. 5. Chlorine substitution at the ortho positions of both phenyl rings: o,o'-Cl2(C6H4)2CH2. 6. Chlorine substitution at one ortho and one para position on the phenyl rings: o,p'-Cl2(C6H4)2CH2. Hence, the maximum number of structural isomers possible when one hydrogen atom in diphenyl methane is substituted by a chlorine atom is 6, and the correct answer is (c) 6.