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प्रश्न
Write a chemical equation for the following reaction:
Propanone is treated with dilute Ba( OH)2.
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उत्तर
This is a self-aldol condensation reaction.
\[\begin{array}{cc}
\phantom{............}\ce{CH3} \phantom{........................}\ce{CH3}\phantom{}\\
\phantom{..........................}|\phantom{............................}|\phantom{.................}\\
\ce{\underset{\text{Acetone or propanone}}{2CH3COCH3}<-->[Dil. Ba(OH)2] CH3-C-CH2-CO-CH3->[ ][\Delta]CH3-\underset{\text{4-methyl pent-3-en-2-one}}{C=CH-CO-CH3 }+ H2O}\\
\phantom{..................................}|\phantom{........................} \text{(Aldol condensation product)}\phantom{..}\\
\ce{\underset{\text{4-Hydroxy-4-methyl pentan-2-one(ketol)}}{OH}}\phantom{...................}\\
\end{array}\]
संबंधित प्रश्न
How will you convert ethanal into the following compound?
But-2-enal
Write structural formulas and names of four possible aldol condensation products from propanal and butanal. In each case, indicate which aldehyde acts as nucleophile and which as electrophile.
Complete the synthesis by giving missing starting material, reagent or product.
\[\begin{array}{cc}
\ce{C6H5CHO}\phantom{............}\\
\phantom{........}\ce{+\phantom{......}\ce{->[dil.NaOH][\Delta]}}\phantom{...}\\
\ce{CH3CH2CHO}\phantom{............}
\end{array}\]
Write chemical equations of the following reaction :
Propanone is treated with dilute Ba (OH)2-.
Compound ‘A’ was prepared by oxidation of compound ‘B’ with alkaline \[\ce{KMnO4}\]. Compound ‘A’ on reduction with lithium aluminium hydride gets converted back to compound ‘B’. When compound ‘A’ is heated with compound B in the presence of \[\ce{H2SO4}\] it produces fruity smell of compound C to which family the compounds ‘A’, ‘B’ and ‘C’ belong to?
When liquid ‘A’ is treated with a freshly prepared ammoniacal silver nitrate solution, it gives bright silver mirror. The liquid forms a white crystalline solid on treatment with sodium hydrogensulphite. Liquid ‘B’ also forms a white crystalline solid with sodium hydrogensulphite but it does not give test with ammoniacal silver nitrate. Which of the two liquids is aldehyde? Write the chemical equations of these reactions also.
Convert the following:
Acetaldehyde to But-2-enal
\[\ce{CH3-CH2-CHO ->[dil][alkali] Product}\]
The product in the above reaction is:
The major product of the following reaction is:
When acetaldehyde is treated with dilute NaOH, the following reaction is observed.
\[\begin{array}{cc}
\ce{2CH3 - CHO ->[dil.NaOH] CH3 - CH - CH2 - CHO}\\
\phantom{...............}|\\
\phantom{.................}\ce{OH}
\end{array}\]
- What are the functional groups in the product?
- Can another product be formed during the same reaction? (Deduce the answer by doing atomic audit of reactant and product).
- Is this an addition reaction or condensation reaction?
