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Current Question (ID: 10880)

Question:

$\text{The structure of diphenylmethane is given below:}$ $\text{(Structure shows two benzene rings connected by a CH}_2 \text{ group)}$ $\text{The number of structural isomers possible when one of the hydrogen atom is replaced by a chlorine atom are :}$

Options:

1. $6$
2. $4$ (Correct)
3. $8$
4. $7$

Solution:

$\text{Hint: Isomers are those compounds which have the same molecular formula but the arrangement of atoms is different.}$ $\text{The molecular formula of diphenyl methane shows four isomers in form of mono chloro derivatives}$ $\text{Diphenylmethane has the molecular formula } \text{C}_{13}\text{H}_{12}$ $\text{Monochloro derivatives:}$ $\text{(i) Chlorine at ortho position of first benzene ring}$ $\text{(ii) Chlorine at meta position of first benzene ring}$ $\text{(iii) Chlorine at para position of first benzene ring}$ $\text{(iv) Chlorine replacing hydrogen on the central CH}_2 \text{ group}$ $\text{Due to symmetry of the molecule, the positions on both benzene rings are equivalent, so we get 4 structural isomers.}$

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Expected JSON Format:

{
  "question": "The mass of carbon present in 0.5 mole of $\\mathrm{K}_4[\\mathrm{Fe(CN)}_6]$ is:",
  "options": [
    {
      "id": 1,
      "text": "1.8 g"
    },
    {
      "id": 2,
      "text": "18 g"
    },
    {
      "id": 3,
      "text": "3.6 g"
    },
    {
      "id": 4,
      "text": "36 g"
    }
  ],
  "solution": "\\begin{align}\n&\\text{Hint: Mole concept}\\\\\n&1 \\text{ mole of } \\mathrm{K}_4[\\mathrm{Fe(CN)}_6] = 6 \\text{ moles of carbon atom}\\\\\n&0.5 \\text{ mole of } \\mathrm{K}_4[\\mathrm{Fe(CN)}_6] = 6 \\times 0.5 \\text{ mol} = 3 \\text{ mol}\\\\\n&1 \\text{ mol of carbon} = 12 \\text{ g}\\\\\n&3 \\text{ mol carbon} = 12 \\times 3 = 36 \\text{ g}\\\\\n&\\text{Hence, 36 g mass of carbon present in 0.5 mole of } \\mathrm{K}_4[\\mathrm{Fe(CN)}_6].\n\\end{align}",
  "correct_answer": 4
}