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Current Question (ID: 10881)

Question:

$\text{The optically active compound among the following is-}$

Options:

1. $\text{Butane}$
2. $\text{2-Methyl pentane}$
3. $\text{4-Methyl pentane}$
4. $\text{3-Methyl hexane}$ (Correct)

Solution:

$\text{Hint: If a molecule contains a chiral center it is optically active.}$ $\text{Explanation:}$ $\text{Step 1:}$ $\text{The structure of 3-methylhexane is as follows:}$ $\text{3-methylhexane: } \text{CH}_3-\text{CH}_2-\text{CH}(\text{CH}_3)-\text{CH}_2-\text{CH}_2-\text{CH}_3$ $\text{The central carbon atom is bonded to four different groups:}$ $\text{1. H atom}$ $\text{2. CH}_3 \text{ group}$ $\text{3. CH}_2\text{CH}_3 \text{ group}$ $\text{4. CH}_2\text{CH}_2\text{CH}_3 \text{ group}$ $\text{Step 2:}$ $\text{3-Methyl hexane is optically active because of molecular un-symmetry and chiral carbon. Hence it is capable of existing as a pair of enantiomers.}$ $\text{It has a chiral carbon and is optically active.}$

Import JSON File

Upload a JSON file containing LaTeX/MathJax formatted question, options, and solution.

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
}