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Haloalkanes and Haloarenes — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistryHaloalkanes and Haloarenes1 Mark
MCQ
Which reagent will you use for the following reaction$?\ \text{CH}_3\text{CH}_2\text{CH}_2\text{CH}_3\xrightarrow{ \ \ \ \ \ \ \ \ \ \ \ \ \ }\text{CH}_3\text{CH}_2\text{CH}_2\text{CH}_2\text{Cl}+\text{CH}_3\text{CH}_2\text{CHClCH}_3$
  • ✓
    $\mathrm{Cl}_2 / UV$ light
  • B
    $\mathrm{NaCl}+\mathrm{H}_2 \mathrm{SO}_4$
  • C
    $\mathrm{Cl}_2$ gas in dark
  • D
    $\mathrm{Cl}_2$ gas in the presence of in dark
✓

Answer

Correct option: A.
$\mathrm{Cl}_2 / UV$ light
Free radical chlorination or bromination of alkanes gives a complex mixture of isomeric mono- and polyhaloalkanes, which is difficult to separate as pure compounds. In this case a mixture of the two isomeric forms of butane is obtained by the use of $\mathrm{Cl}_2 / UV$ light as`per reaction below$-
\text{CH}_3\text{CH}_2\text{CH}_2\text{CH}_3\xrightarrow[\text{or heat}]{ \ \ \ \text{Cl}_2/\text{ UV light}\ \\ \ \ }\text{CH}_3\text{CH}_2\text{CH}_2\text{CH}_2\text{Cl}+\text{CH}_3\text{CH}_2\text{CHClCH}_3$

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