NEET – 2019 – NEETmcqs

Which of the following is produced when the vapours of secondary alcohol are passed over heated copper at 573 K?

A carboxylic acid
An aldehyde
A ketone
An alkene

Explanation:

Hint: The reaction is an example of the oxidation reaction

Explanation:

Step 1: When the vapours of primary or secondary alcohol are passed over heated copper at 573 K, dehydrogenation takes place and an aldehyde or a ketone is formed while tertiary alcohols undergo dehydration.

Step 2: The reaction is as follows:

$R - \overset{O H}{\overset{|}{C H}} - R' \underset{573}{\to}$ $R - \overset{|}{C H} O H - R' \to 573$
$C u ∆ R - \overset{O}{\overset{| |}{C}} - R'$ $C u ∆ R - \overset{| |}{C} O - R'$

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Exam: NEET – 2019

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NEET - 2019

Ethers: Preparation & Properties, Uses

The major products C and D formed in the following reaction respectively are:
$CH_3CH_2CH_2OC{(CH_3)}_3 \xrightarrow[\Delta]{\text{Excess}\ HI}\ C + D$