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Question
What is meant by the following term? Give an example of the reaction in the following case.
Acetal
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Solution
Gem-dialkoxy compounds in which two alkoxy groups are present on the terminal carbon atom are called acetals. These are formed when the aldehyde reacts with two equivalents of monohydric alcohol in the presence of dry hydrogen chloride.

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RELATED QUESTIONS
Predict the products of the following reactions:

Draw the structure of the semicarbazone of ethanal.
Write the structures of the main products when acetone (CH3 − CO − CH3) reacts with the following reagent :
H2N − NHCONH2/H+
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Benzaldehyde, p-Tolualdehyde, p-Nitrobenzaldehyde, Acetophenone.
Hint: Consider steric effect and electronic effect.
Predict the product of the following reaction:
\[\begin{array}{cc}
\phantom{..............}\ce{O}\\
\phantom{..............}||\\
\ce{R - CH = CH - CHO + NH2 - C - NH - NH2 ->[H+]}\end{array}\]
What is meant by the following term? Give an example of the reaction in the following case.
2, 4-DNP-derivative
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Complete the synthesis by giving missing starting material, reagent or product.

How are the following compounds prepared?
acetophenone from benzene
Alkenes
and carbonyl compounds
, both contain a π bond but alkenes show electrophilic addition reactions whereas carbonyl compounds show nucleophilic addition reactions. Explain.
Carboxylic acids contain carbonyl group but do not show the nucleophilic addition reaction like aldehydes or ketones. Why?
A Idol condensation will not be observed in
Acetaldehyde and acetone differ in their reaction with
Which will undergo faster nucleophilic addition reaction?
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The product "P" in the above reaction is:
Aldehydes and ketones react with hydroxylamine to form ______.
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Acetaldehydedimethylacetal
Draw structure of the following derivative:
Acetaldehydedimethylacetal
Give an example of the reaction in the following case.
Oxime
