Advertisements
Advertisements
प्रश्न
What is meant by the following term? Give an example of the reaction in the following case.
Hemiacetal
Advertisements
उत्तर
Gem-alkoxyalcohols are called hemiacetals. These are produced when a molecule of monohydric alcohol combines with an aldehyde in the presence of dry HCl gas.
\[\begin{array}{cc}
\ce{H3C}\phantom{.........................}\ce{CH3}\phantom{....}\ce{OH}\\
\backslash\phantom{...........................}\backslash\phantom{...}/\\
\ce{C = O + H - OCH3 <=>[Dry HCl_{(g)}] C}\\
/\phantom{...........................}/\phantom{...}\backslash\\
\phantom{....}\ce{H}\phantom{...........................}\ce{\underset{Hemiacetal}{H\phantom{....}OCH3}}\
\end{array}\]
APPEARS IN
संबंधित प्रश्न
Predict the product of the following reaction:
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.
Oxime
What is meant by the following term? Give an example of the reaction in the following case.
2, 4-DNP-derivative
Predict the products formed when cyclohexanecarbaldehyde reacts with the following reagents.
PhMgBr and then H3O+
Give plausible explanation for the following:
Cyclohexanone forms cyanohydrin in good yield but 2, 2, 6 trimethylcyclohexanone does not.
Complete the synthesis by giving missing starting material, reagent or product.
\[\ce{C6H5CHO ->[H2NCONHNH2]}\]
Write the main product formed when propanal reacts with the following reagents:
2 moles of 3 CH OH in presence of dry HCl
Carboxylic acids contain carbonyl group but do not show the nucleophilic addition reaction like aldehydes or ketones. Why?
Reaction of aqueous sodium hydroxide on chlorobenzene gives which of the following products?
What happens when propanone is treated with CH3MgBr and then hydrolysed?
What happens when ethanal is treated with excess ethanol and acid?
Draw structure of the following derivative.
The ethylene ketal of hexane-3-one
Draw the structure of the following derivative.
Acetaldehydedimethylacetal
Draw the structure of the following derivative.
The ethylene ketal of hexan-3-one
Draw the structure of the following derivative.
Acetaldehydedimethylacetal
Draw structure of the following derivative.
The ethylene ketal of hexan-3-one
Which of the following will not be formed when calcium formate is distilled with calcium acetate?
