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Hydrocarbons — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryHydrocarbons1 Mark
MCQ
$\mathrm{CH}_3-\mathrm{C} \equiv \mathrm{C} \ \text{MgBr}$ can be prepared by the reaction of $ ..........$
  • A
    $\mathrm{CH}_3-\mathrm{C} \equiv \mathrm{C}-\mathrm{Br}$ with $\mathrm{MgBr}_2$
  • B
    $\mathrm{CH}_3-\mathrm{C} \equiv \mathrm{CH}$ with $\mathrm{MgB}_2$
  • C
    $\mathrm{CH}_2-\mathrm{C} \equiv \mathrm{CH}$ with $\text{KBr}$ and $\text{Mg}$ metal
  • ✓
    $\mathrm{CH}_3-\mathrm{C} \equiv \mathrm{CH}$ with $\mathrm{CH}_3 \mathrm{MgBr}$
✓

Answer

Correct option: D.
$\mathrm{CH}_3-\mathrm{C} \equiv \mathrm{CH}$ with $\mathrm{CH}_3 \mathrm{MgBr}$
$\mathrm{CH}_3-\mathrm{C} \equiv \mathrm{C}-\mathrm{H}+\mathrm{CH}_3 \mathrm{MgBr} \rightarrow \mathrm{CH}_3-\mathrm{C} \equiv \mathrm{CMgBr}+\mathrm{CH}_4$.

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