Q. 25

Write the structu

Answer :

(a)


A – CH3COCl


Acetic acid reacts with phosphorous pentachloride to give Acetyl chloride.


B – CH3CHO


Acetyl chloride undergoes Rosenmund reduction with Pd in the presence of BaSO4 to give Acetaldehyde.


C – CH3CH(OH)CH3


Acetaldehyde reacts with Grignard reagent to give 2-Propanol.


D – CH3CH2OH


Acetaldehyde gets reduced in the presence of Lithium aluminium hydride to give Ethanol.


(b)


(i)


• Butanal is an aldehyde and answers Tollens’ reagent but Ethyl methyl ketone does not answer.


• Upon reaction with Tollens reagent, Butanal gives silver mirror.


(ii)


• Ethanoic acids answers the litmus test by changing red litmus blue whereas Ethanal does not answer this test as it is neutral in nature.


• This test is used for distinguishing Ethanal from Ethanoic acid.


(iii) 4-Chloro-pentan-2-one



OR


(a)


(i) Propanal reacts with Zinc amalgam in the presence of conc. HCl to under goClemmenson Reduction and give the corresponding hydrocarbon, in this case propane.


CH3-CH2-CH3


(ii) Propanal reacts with Hydroxylamine to give the oxime of propane.


CH3-CH2-CH=NOH


(iii) Propanal reacts with HCN to undergo a nucleophilic reaction giving a cyanohydrin.


CH3CH2CH(OH)CN


(b)


• Aldehydes undergo nucleophilic addition reactions more easily than ketones.


• Formaldehyde undergoes nucleophilic addition easily than acetaldehyde.


• Thus, the decreasing order of reactivity is


HCHO>CH3CHO>CH3-CO-CH3


(c)


• Acetophenone reacts with Iodoform test to prove the presence of CH3C=O group.


• This answers by giving a yellow precipitate.


• Benzaldehyde does not answer Iodoform test.


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