Which of the following on heating with aqueous KOH produces acetaldehyde ?

  • Option 1)

    CH_{3}COCl

  • Option 2)

    CH_{3}CH_{2}Cl

  • Option 3)

    CH_{2}ClCH_{2}Cl

  • Option 4)

    CH_{3}CHCl_{2}

 

Answers (1)

As we learnt in 

Hydrolysis of Trihalogen derivatives -

Three halogen atoms are attached to the same carbon atom yield carboxylic acid. 

- wherein

RCX_{3}+3KOH\rightarrow RCOOH+3KX+H_{2}O

 

 

Three halogen atom at a carbon yields acid while two halogen atom at a carbon yields aldehyde

CH_{3}CHCl_{2}\overset{\Delta KOH}{\rightarrow}CH_{3}CH(OH)_{2}\overset{-H_{2}O}{\rightarrow}CH_{3}CHO


Option 1)

CH_{3}COCl

This option is incorrect

Option 2)

CH_{3}CH_{2}Cl

This option is incorrect

Option 3)

CH_{2}ClCH_{2}Cl

This option is incorrect

Option 4)

CH_{3}CHCl_{2}

This option is correct

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