Name: Preparation of Alcohols from Alkenes
Uploaded: 2019-07-19
Duration: 4 min 6 s
Description: The alcohols are important organic compounds that can be prepared by the hydration of alkenes. Do you know how the reaction proceeds? Let’s watch the video t...

Question

An alkene is known to be either But-

1

-ene or But-

2

-ene. When heated with concentrated acidified potassium mangante(

VII

) solution, bubbles of carbon dioxide gas were given off. Name the alkene.

Accepted Answer

Alkene on reacting with hot, concentrated solution of acidified potassium manganate( $VII$ ), the carbon-carbon double bond in the alkenes is broken completely. The $- OH$ groups in the diol formed initially are further oxidised to ketones, carboxylic acids. The terminal alkene gives carbon dioxide and water as by-products. Therefore, the given alkene is But- $1$ -ene.

$\underset{But - 1 - ene}{{CH}_{3} {CH}_{2} CH = {CH}_{2}} + 5 [O] \overset{Acidified {KMnO}_{4}}{\to} {CH}_{3} {CH}_{2} COOH + H_{2} O + {CO}_{2}$

$\underset{But - 2 - ene}{{CH}_{3} CH = {CHCH}_{3}} + 4 [O] \overset{Acidified {KMnO}_{4}}{\to} 2 {CH}_{3} COOH$

An alkene is known to be either But- $1$ -ene or But- $2$ -ene. When heated with concentrated acidified potassium mangante( $VII$ ) solution, bubbles of carbon dioxide gas were given off. Name the alkene.

Important Questions on Hydrocarbons

Learn and Prepare for any exam you want !

An alkene is known to be either But-1-ene or But-2-ene. When heated with concentrated acidified potassium mangante(VII) solution, bubbles of carbon dioxide gas were given off. Name the alkene.

Important Questions on Hydrocarbons

Learn and Prepare for any exam you want !

An alkene is known to be either But- $1$ -ene or But- $2$ -ene. When heated with concentrated acidified potassium mangante( $VII$ ) solution, bubbles of carbon dioxide gas were given off. Name the alkene.