Edexcel A-Level Chemistry AS 10.17 The Reactions of Alcohols with I Oxygen in Air Combustion Ii Halogenating Agents Pcl5 to Produce Chloroalkanes Questions

Practise Edexcel IAL Chemistry 10.17 by applying alcohol combustion, PCl5 and other halogenating-agent reactions, and phosphoric-acid elimination to alkenes.

Exam points

describe combustion of alcohols in oxygen, including incomplete-combustion products
use halogenating agents to make halogenoalkanes and test for the hydroxy group
use concentrated phosphoric acid to eliminate alcohols to alkenes

[Maximum number: 2]

This is a question about alcohols.

(a)

Alcohols can be converted into halogenoalkanes.

[ 2 ]

(i)

Write the equation for the reaction between methanol, $\mathrm{CH}_{3} \mathrm{OH}$ , and phosphorus(V) chloride, $\mathrm{PCl}_{5}$ .

[ 1 ]

correct equation

Example of equation
$\mathrm{CH}_{3} \mathrm{OH}+\mathrm{PCl}_{5} \rightarrow \mathrm{CH}_{3} \mathrm{Cl}+\mathrm{POCl}_{3}+\mathrm{HCl}$

Allow multiples

Allow $\mathrm{PCl}_{3} \mathrm{O}$

Ignore state symbols even if incorrect

(1)

(ii)

State the observation that would be made from this reaction.

[ 1 ]

An answer that makes reference to the following point:

- steamy fumes / misty fumes / white fumes

Ignore effervescence / bubbles / gets hot / $\mathrm{PCl}_{5}$ dissolves

Do not award white smoke / additional incorrect observations

(1)

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Edexcel A-Level Chemistry AS 10.17 The Reactions of Alcohols with I Oxygen in Air Combustion Ii Halogenating Agents Pcl5 to Produce Chloroalkanes Questions question 1

Question (a)

Question (i)

Question (ii)