Tag: chemistry

Questions Related to chemistry

 When ethanol react with sodium,which gas will produce?

chemistry carbon compounds some important carbon compounds ethanol and ethanoic acid introduction to alcohols - ethanol

  1. hydrogen

  2. oxygen

  3. sodium ethoxide

  4. carbon dioxide

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Correct Option: A
Explanation:

If a small piece of sodium is dropped into some ethanol, it reacts steadily to give off bubbles of hydrogen gas and leaves a colourless solution of sodium ethoxide, $CH _3CH _2ONa$ and hydrogen gas is evolved.

$2C _2H _5OH + 2Na \rightarrow 2C _2H _5ONa + H _2$ Option A is correct.

Vinegar is a :

chemistry carbon compounds some important carbon compounds ethanol and ethanoic acid introduction to alcohols - ethanol

  1. 5-8% solution of acetic acid in water

  2. 25-30% solution of acetic acid in water

  3. 40-45% solution of acetic acid in water

  4. 45-50% solution of acetic acid in water

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Correct Option: A
Explanation:

Vinegar is a liquid containing acetic acid and water. This acetic acid is produced by the fermentation of ethanol by acetic acid bacteria. It is mainly used as a cooking ingredient. It is a 5-8% solution of acetic acid in water and most easily available mild acid.

$ N{ a } _{ 2 }C{ O } _{ 3 }+2C{ H } _{ 3 }COOH\longrightarrow $ 

Which gas is produced in this reaction?

chemistry carbon compounds some important carbon compounds ethanol and ethanoic acid introduction to alcohols - ethanol

  1. ${ H } _{ 2 }O $

  2. $CO _2$

  3. $CO$

  4. $H _2$

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Correct Option: B

$ NaOH+{ C }{ H } _{ 3 }COOH\longrightarrow C{ H } _{ 3 }COONa+{ H } _{ 2 }O $

This reaction is called : 

chemistry carbon compounds some important carbon compounds ethanol and ethanoic acid introduction to alcohols - ethanol

  1. oxidation reaction

  2. hydrogention reaction

  3. neutralisation reaction

  4. addition reaction

Show answer
Correct Option: C
Explanation:

Acid and Base reacts to form Salt and Water. This reaction is called neutralisation reaction. In this, acid is acetic acid and base is sodium hydroxide. Salt ($CH _3COONa$) is formed.

Proof is defined as _______ the percentage by volume of alcohol in ethanol-water mixture.

chemistry carbon compounds some important carbon compounds ethanol and ethanoic acid introduction to alcohols - ethanol

  1. twice

  2. thrice

  3. half

  4. four times

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Correct Option: A
Explanation:
The term was originally used in the United Kingdom and was equal to about  7/4 times the alcohol by volume (ABV). The UK now uses the ABV standard instead of alcohol proof. In the United States, alcoholic proof is defined as twice the percentage of ABV.

Which of the following will react with sodium metal?

chemistry carbon compounds some important carbon compounds ethanol and ethanoic acid introduction to alcohols - ethanol

  1. Ethanol

  2. Ethanal

  3. Ethene

  4. Ethane

Show answer
Correct Option: A
Explanation:

$2CH _3CH _2OH + 2Na\longrightarrow 2CH _3CH _2ONa + H _2$
$2H _2O + 2Na\longrightarrow 2NaOH + H _2$

The organic acid present in vinegar is :

chemistry carbon compounds some important carbon compounds ethanol and ethanoic acid introduction to alcohols - ethanol

  1. methanoic acid

  2. ethanoic acid

  3. propanoic acid

  4. none of these

Show answer
Correct Option: B
Explanation:

Vinegar is also known as acetic acid and water. Acetic acid is ethanoic acid produced by the fermentation of ethanol by acetic acid bacteria. Vinegar is a cooking ingredient and commercially produced by fast or slow fermentation processes. 

Acetic acid is:

chemistry carbon compounds some important carbon compounds ethanol and ethanoic acid introduction to alcohols - ethanol

  1. Methanoic acid

  2. Ethanoic acid

  3. Propanoic acid

  4. None of these

Show answer
Correct Option: B
Explanation:

Acetic acid is Ethanoic acid $CH _3COOH$. It is also called vinegar.

Which of the following product is obtained during reaction of ethanoic acid with diazomethane in presence of $dil. HCl$?

chemistry carbon compounds some important carbon compounds ethanol and ethanoic acid introduction to alcohols - ethanol

  1. Methyl acetate

  2. Ethyl acetate

  3. Methyl formate

  4. Ethyl formate

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Correct Option: A
Explanation:

Methyl acetate is obtained during reaction of ethanoic acid with diazomethane in presence of dil HCl.
$CH _3COOH + CH _2N _2 \xrightarrow {dil HCl} CH _3COOCH _3 + N _2$

Which of the following product(s) is$/$are obtained during the reaction of ethanoic acid with chlorine?

chemistry carbon compounds some important carbon compounds ethanol and ethanoic acid introduction to alcohols - ethanol

  1. Monochloroacetic acid

  2. Dichloroacetic acid

  3. Trichloroacetic acid

  4. All of the above

Show answer
Correct Option: D
Explanation:

When ethanoic acid reacts with chlorine in the presence of acetic anhydride as catalyst it forms chloroacetic acid.

$CH _3COOH  + Cl _2 \rightarrow ClCH _2COOH + HCl$