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Hydrocarbons — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryHydrocarbons1 Mark
MCQ
Compound $A\ ($molecular formula $\mathrm{C}_5 \mathrm{H}_{10})$ gives only one monochlorinated product. Write the structure of compound $A$.
  • A
    $1-$ pentene
  • B
    $2-$ pentene
  • C
    $1-$ methyl cyclobutane
  • ✓
    Cyclopentane
✓

Answer

Correct option: D.
Cyclopentane
Cyclopentane $\xrightarrow{\text{Cl}_2​+\text{hv}}$​ Cyclopentylchloride
Compound $A$ has molecular formula $\mathrm{C}_5 \mathrm{H}_{10}$​.
The degree of unsaturation is $1$. It should have either one double bond or should be a cyclic compound. If it has one double bond, then it will give many monochlorinated products.
However, it gives only one monochlorinated product.
So, it is a cyclic compound. Thus, it should be cyclopentane.

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