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BITSAT 2010

Exam: BITSAT
Year: 2010
Subject: Chemistry
Chapter: Haloalkanes and Haloarenes

BITSAT 2010 · Chemistry · Haloalkanes and Haloarenes

In which of the following conversions, phosphorus pentachloride is...

In which of the following conversions, phosphorus pentachloride is used as the reagent?

Options

A $\mathrm{H}_{2}$ \mathrm{C}=\mathrm{CH} $_{2} \longrightarrow \mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{Cl}$
B $\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OH} \longrightarrow \mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{Cl}$
C $\mathrm{H}_{3} \mathrm{C}-\mathrm{O}-\mathrm{CH}_{3} \longrightarrow \mathrm{CH}_{3} \mathrm{Cl}$
D $\mathrm{CH} \equiv \mathrm{CH} \longrightarrow \mathrm{CH}_{2}=\mathrm{CHCl}$

Correct answer

B. $\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OH} \longrightarrow \mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{Cl}$

Step-by-step solution

When ethyl alcohol is treated with

\mathrm{PCl}_{5}

, then ethyl chloride is formed.

\begin{aligned}\mathrm{CH}_{3} \mathrm{CH}_{2}-\mathrm{OH}&+\mathrm{PCl}_{5} \longrightarrow_{\Delta}\\ & \mathrm{CH}_{3} \mathrm{CH}_{2}-\mathrm{Cl}+\mathrm{HCl}+\mathrm{POCl}_{3} \end{aligned}

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