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Current Question (ID: 10921)

Question:

$\text{The correct order with respect to -I effect of the substituents is:}$ $\text{(R = alkyl)}$

Options:

1. $-\text{NH}_2 > -\text{OR} < -\text{F}$
2. $-\text{NR}_2 < -\text{OR} < -\text{F}$ (Correct)
3. $-\text{NH}_2 > -\text{OR} > -\text{F}$
4. $-\text{NR}_2 > -\text{OR} > -\text{F}$

Solution:

$\text{Hint: Electron withdrawing nature of groups, or an atom is called a -I inductive effect.}$ $\text{As the electronegativity of heteroatom attaches to a parent chain increases, the -I effect of atom or group is increases. The order of groups and atoms according to their electronegativity is as follows:}$ $-\text{NH}_2 < -\text{OR} < -\text{F}$ $\text{Hence, the -I effect order is:}$ $-\text{NR}_2 < -\text{OR} < -\text{F}$ $\text{This means that fluorine has the strongest -I effect due to its highest electronegativity, followed by -OR groups, and -NR}_2\text{ groups have the weakest -I effect among these substituents.}$

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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
}