Question

convert CH3CH2COOH to CH3CH2Br

Answer 1

React it with NaOH and then CaO and NaOH(decarboxylation) will give 
CH3CH3  then react it with dehydrogenate with KOH or K2O will give ethene 
then Br2 will give CH3CH2Br

Answer 2

To convert CH₃CH₂COOH to CH₃CH₂Br following step takes place-

STEP 1: CONVERSION OF PROPANOIC ACID TO PROPANAMIDE

• Propanoic acid when reacted with an excess of ammonia gives propanamide.

The reaction is given by-

CH₃CH₂COOH + NH₃ ----------> CH₃CH₂CONH₂

STEP 2: REACTION OF PROPANAMIDE WITH AN AQUEOUS SOLUTION OF BROMINE.

• Propanamide, when treated with aqueous solution of bromine or ethanol, is the solution of sodium hydroxide that degrades to form ethyl amine (primary amine).

The reaction is given by -

CH₃CH₂CONH₂ -------> CH₃CH₂NH₂

CH₃CH₂CONH₂-------> CH₃CH₂NH₂ (in presence of Br₂/NaOH)

STEP 3: CONVERSION OF ETHYL AMINE TO ETHYL ALCOHOL.

• Ethylamine reacts with a nitrous acid which is obtained from an aqueous solution of NaNO₂ and dilute HCL to form ethyl diazonium chloride at a temperature of 5°c
• Ethyldiazonium chloride on heating gives ethanol and chloride gas.

The reaction is given by -

CH₃CH₂NH₃+HNO--->C₆H₄ClN₃O₂

CH₃CH₂NH₂+HNO------------->C₆H₄ClN₃O₂

C₆H₄ClN₃O₂+ heat --------> CH₃CH₂OH + Cl₂

STEP 4: REACTION OF ETHYL ALCOHOL WITH PHOSPHORUS TRIBROMIDE.

• Ethyl alcohol reacts with phosphorus tribromide to give ethyl bromide and phosphorus acid.

The reaction is given by-

CH₃CH₂OH + Pbr₃ -----------> CH₃CH₂Br + H₃PO₃

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