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Current Question (ID: 17611)

Question:

$\text{Which of the following statement(s) is/are correct about the elimination reaction of 2-Bromopentane to form pent-2-ene:}$ $\text{(a) } \beta\text{-Elimination reaction}$ $\text{(b) Follows Zaitsev rule}$ $\text{(c) Dehydrohalogenation reaction}$ $\text{(d) Dehydration reaction}$

Options:

1. $\text{(a), (c), (d)}$
2. $\text{(b), (c), (d)}$
3. $\text{(a), (b), (d)}$
4. $\text{(a), (b), (c)}$

Solution:

$\text{Hint: The reaction is an example of an elimination reaction}$ $\text{The reaction is as follows:}$ $\text{CH}_3 - \text{CH} - \text{CH}_2 - \text{CH}_2 - \text{CH}_3 \xrightarrow{\text{Alcoholic KOH}} \text{CH}_3 - \text{CH} = \text{CH} - \text{CH}_2 - \text{CH}_3$ $\text{It is } \beta\text{-elimination, follows Zaitsev rule because more substituted alkene is obtained as a product. In this reaction, hydrogen and Br are removed simultaneously. Hence it is also known as dehydrohalogenation.}$

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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
}