Advertisements
Advertisements
प्रश्न
Answer in brief.
Write reaction showing conversion of Acetaldehyde into acetaldehyde dimethyl acetal.
Advertisements
उत्तर
Step 1:
\[\begin{array}{cc}
\ce{H3C\phantom{..............................}}\ce{H\phantom{.........}}\\
|\phantom{..................................}|\phantom{.........}\\
\phantom{.}\ce{C = O + CH3 - OH ⇌[dry HCl][dil.HCl] H3C - C - OCH3}\\
\phantom{.}|\phantom{..................................}|\phantom{.........}\\
\phantom{..}\ce{\underset{Acetaldehyde}{H}}\phantom{......................}\ce{\underset{Hemiacetal (unstable)}{OH}}\phantom{........}
\end{array}\]
Step 2:
\[\begin{array}{cc}
\ce{H\phantom{.....................................}}\ce{H\phantom{.........}}\\
|\phantom{......................................}|\phantom{.........}\\
\ce{H3C - C - OCH3 + CH3 - OH ⇌[dry HCl][dil.HCl] H3C - C - OCH3 + H2O}\\
|\phantom{......................................}|\phantom{.........}\\
\ce{\underset{Hemiacetal (unstable)}{H}\phantom{....................}}
\ce{\underset{Acetaldehyde dimethyl acetal (stable)}{OCH3}\phantom{.}}
\end{array}\]
संबंधित प्रश्न
The following compounds will give positive Fehling’s test.
Explain haloform reaction with suitable example.
Write reactions for the action of the following reagents on p-chlorobenzaldehyde.
Tollen’s reagent
Identify B in the following reaction,
\[\ce{Acetaldoxime ->[Na][alcohol] A ->[NaNO2][HCl] B + H2O + N2\uparrow}\]
\[\begin{array}{cc} \phantom{...}\ce{R}\phantom{.................}\ce{R}\phantom{..}\ce{H}\phantom{................}\\ \phantom{...}\backslash\phantom{..................}\backslash/\phantom{..........}\phantom{.......}\\ \ce{C = O ->[H2NNH2][KOH/glycol] C + N2 + H2O}\\ \phantom{}/\phantom{............}\phantom{.......}/\phantom{}\backslash\phantom{...............}\\ \phantom{}\ce{R}\phantom{..................}\ce{R}\phantom{..}\ce{H}\phantom{...............} \end{array}\]
Reaction is called ____________.
An aldehyde or ketone reacts with hydrogen cyanide to form corresponding cyanohydrin derivatives. This reaction is an example of ____________.
Which of the following does not give yellow solid on treatment with sodium hypoiodlte?
Which of the following will give positive iodoform test?
Which of the following reagents is used for the following conversion?
\[\ce{CH3 - CH = CH - CHO -> CH3 - CH = CH - CH2OH}\]
\[\ce{CH3Br ->[KNC] (A) ->[H3O^+] (B) ->[PCl5] (C)}\] product (C) is:
In which case, chiral carbon is not generated by reaction with HCN.
Which one of the following reaction is an example of disproportionation reaction.
Carboxylic acids have higher boiling points than aldehydes, ketones and even alcohols of comparable molecular mass. It is due to their ____________.
What is the action of HCN on ethanal?
How will you prepare acetamide from methyl cyanide?
How will you prepare lactic acid from ethanol?
How will you prepare ethane from sodium acetate?
In the above reaction, product (B) is:
Which of the following is not correctly matched?
Write the structure of the major product of the aldol condensation of benzaldehyde with acetone.
Write the structure of the major product of the aldol condensation of benzaldehyde with acetone.
How are the following compound obtained from alkyne?
Acetaldehyde
How are the following compound obtained from alkyne?
Acetone
Write the structure of the major product of the aldol condensation of benzaldehyde with acetone.
How will you prepare Acetic anhydride from acetic acid.
Write the structure of the major product of the aldol condensation of benzaldehyde with acetone.
