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Acetal is produced by reacting alcohol i...

Acetal is produced by reacting alcohol in the presence of dry HCl with

A

Acetaldehyde

B

Ketone

C

Ether

D

Carboxylic acid

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The correct Answer is:
A
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Aldehydes react with one equivalent of monohydric alcohol in the presence of dry hydrogen chloride to yield alkoxyalcohol intermediate , known as hemiacetals, which further react with one more molecule of alcohol to give a gem - dialkoxy compound known as acetal. Ketones react with ethtlene glycol under similar conditions to form cyclic products known as ethylene glycol ketals. Dry hydrogen chloride protonates the oxygen of the carbonyl compounds and therefore, increases the electrophilicity of the carbonyl carbon facilitating the nucleophilic attack of ethylene glycol. Acetals and ketals are hydrolysed with aqueous mineral acids to yield corresponding aldehydes and ketones respectively. Whaat is teh role of dry HCl in the formation of hemiacetal by aldehydes using a primay alcohol ?

Write the name of the product when ketones react with 1,2-diol in presence of dry HCl .

Knowledge Check

  • Acetal is produced by reacting an alcohol in the presence of dry HCl with

    A
    acetaldehyde
    B
    ketone
    C
    ether
    D
    carboxylic acid

  • Acetaldehyde and ethyl alcohol reacts in presence of dry HCI. Gas The products obtiained is :

    A
    `CH_(3)CH_(2)CH_(2)OH`
    B
    `CH_(3)-CH(OH)-CH_(3)`
    C
    `CH_(3)-CH(OH)-C_(2)H_(5)`
    D
    `CH_(3)CH(OC_(2)H_(5))_(2)`

  • Three molecules of acetone in the presence of dry HCl form :

    A
    Mesitylene
    B
    Phorone
    C
    Glyoxal
    D
    Mesity oxide

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    Acetic acid reacts with ethyl alcohol in the presence of concentrated sulphuric acid producing a sweet smelling compound. For the reaction : (i) name the main product (ii) write chemical equation.

    Aldehydes react with one equivalent of monohydric alcohol in the presence of dry hydrogen chloride to yield alkoxyalcohol intermediate , known as hemiacetals, which further react with one more molecule of alcohol to give a gem - dialkoxy compound known as acetal. Ketones react with ethtlene glycol under similar conditions to form cyclic products known as ethylene glycol ketals. Dry hydrogen chloride protonates the oxygen of the carbonyl compounds and therefore, increases the electrophilicity of the carbonyl carbon facilitating the nucleophilic attack of ethylene glycol. Acetals and ketals are hydrolysed with aqueous mineral acids to yield corresponding aldehydes and ketones respectively. How can we recover the aldehydes and ketones from acetal and ketal ?

    Aldehydes react with one equivalent of monohydric alcohol in the presence of dry hydrogen chloride to yield alkoxyalcohol intermediate , known as hemiacetals, which further react with one more molecule of alcohol to give a gem - dialkoxy compound known as acetal. Ketones react with ethtlene glycol under similar conditions to form cyclic products known as ethylene glycol ketals. Dry hydrogen chloride protonates the oxygen of the carbonyl compounds and therefore, increases the electrophilicity of the carbonyl carbon facilitating the nucleophilic attack of ethylene glycol. Acetals and ketals are hydrolysed with aqueous mineral acids to yield corresponding aldehydes and ketones respectively. Give the reactions of fomation of alkoxyalcohol.

    Aldehydes react with one equivalent of monohydric alcohol in the presence of dry hydrogen chloride to yield alkoxyalcohol intermediate , known as hemiacetals, which further react with one more molecule of alcohol to give a gem - dialkoxy compound known as acetal. Ketones react with ethtlene glycol under similar conditions to form cyclic products known as ethylene glycol ketals. Dry hydrogen chloride protonates the oxygen of the carbonyl compounds and therefore, increases the electrophilicity of the carbonyl carbon facilitating the nucleophilic attack of ethylene glycol. Acetals and ketals are hydrolysed with aqueous mineral acids to yield corresponding aldehydes and ketones respectively. Give the structure of ethylene glycol ketal

    Aldehydes react with one equivalent of monohydric alcohol in the presence of dry hydrogen chloride to yield alkoxyalcohol intermediate , known as hemiacetals, which further react with one more molecule of alcohol to give a gem - dialkoxy compound known as acetal. Ketones react with ethtlene glycol under similar conditions to form cyclic products known as ethylene glycol ketals. Dry hydrogen chloride protonates the oxygen of the carbonyl compounds and therefore, increases the electrophilicity of the carbonyl carbon facilitating the nucleophilic attack of ethylene glycol. Acetals and ketals are hydrolysed with aqueous mineral acids to yield corresponding aldehydes and ketones respectively. Write the reaction showing hydrolysis of ketal to obtain ketone

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