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Aldehydes Keton...

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  • Question 1
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    A carbonyl compound 'A' reacts with hydrogen cyanide to form a cyanohydrin 'B' which on hydrolysis gives an optically active alpha hydroxy acid 'C'. 'A' gives a positive iodoform test 'A', 'B' and 'C' are given by the set :-

  • Question 2
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    Directions For Questions

    Aldehyde, ketone, acid and acid derivatives contain $$>C = O$$ group. Aldehyde and ketones give nucleophilic addition reactions whereas acid and acid derivatives give nucleophilic addition followed by elimination reactions. Nucleophilic addition reactions followed by elimination of acid derivatives is known as acyl substitution reaction. This substitution reaction takes places by the formation of tetrahedral intermediate.

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    Which of the following compounds has very poor leaving group?

  • Question 3
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    Directions For Questions

    Aldehyde, ketone, acid and acid derivatives contain $$>C = O$$ group. Aldehyde and ketones give nucleophilic addition reactions whereas acid and acid derivatives give nucleophilic addition followed by elimination reactions. Nucleophilic addition reactions followed by elimination of acid derivatives is known as acyl substitution reaction. This substitution reaction takes places by the formation of tetrahedral intermediate.

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    For the given reaction, which of these is correct?

  • Question 4
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    Directions For Questions

    Aldehydes and ketones are amphoteric. Thus they can act both as acids and bases. Under acidic conditions, the carbon of the protonated carbonyl group is much more electrophilic, reacting even with weak nucleophilie. Carbonyl compound gives nucleophilic addition reaction. In this reaction the nucleophilic attack precedes the electrophilic attack. 

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    Which of these statements are correct ?

  • Question 5
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    Directions For Questions

    Aldehydes and ketones are amphoteric. Thus they can act both as acids and bases. Under acidic conditions, the carbon of the protonated carbonyl group is much more electrophilic, reacting even with weak nucleophilie. Carbonyl compound gives nucleophilic addition reaction. In this reaction the nucleophilic attack precedes the electrophilic attack. 

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    Carbonyl compounds gives nucleophilic addtion with :

  • Question 6
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    Directions For Questions

    Aldehydes and ketones are amphoteric. Thus they can act both as acids and bases. Under acidic conditions, the carbon of the protonated carbonyl group is much more electrophilic, reacting even with weak nucleophilie. Carbonyl compound gives nucleophilic addition reaction. In this reaction the nucleophilic attack precedes the electrophilic attack. 

    ...view full instructions

    Which of the statements are/is correct ? 

  • Question 7
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    Directions For Questions

    Aldehyde and ketones are specially susceptible to nucleophile addition because carbonyl group $$>C=O$$ is polar (due to electronegativity different between carbon and oxygen). >$$\overset{\delta +}{C} - \overset{\delta-}{O}$$ Positive charge on carbon makes it reactive towards the nucleophile. This addition is catalysed by acid.
    Reactivity of carbonyl compound towards nucleophilic addition increases with increase in the electron deficiency at carbonyl carbon. Thus, ($$-I.E.$$) group increase while ($$+I.E.$$) groups decrease the reactivity of carbonyl compound.

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    Which of the following is most reactive to give nucleophilic addition ? 

  • Question 8
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    In this reaction: $$\displaystyle CH_{3}CHO+HCN \rightarrow CH_{3}CH(OH)CN \xrightarrow[] {H.OH}CH_{3}CH(OH)COOH$$, an asymmetric centre is generated. The acid obtained would be:

  • Question 9
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    Directions For Questions

    Aldehyde and ketones are specially susceptible to nucleophile addition because carbonyl group $$>C=O$$ is polar (due to electronegativity different between carbon and oxygen). >$$\overset{\delta +}{C} - \overset{\delta-}{O}$$ Positive charge on carbon makes it reactive towards the nucleophile. This addition is catalysed by acid.
    Reactivity of carbonyl compound towards nucleophilic addition increases with increase in the electron deficiency at carbonyl carbon. Thus, ($$-I.E.$$) group increase while ($$+I.E.$$) groups decrease the reactivity of carbonyl compound.

    ...view full instructions

    Carbonyl compounds show nucleophilic addition with :  

  • Question 10
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    Directions For Questions

    Aldehyde and ketones are specially susceptible to nucleophile addition because carbonyl group $$>C=O$$ is polar (due to electronegativity different between carbon and oxygen). >$$\overset{\delta +}{C} - \overset{\delta-}{O}$$ Positive charge on carbon makes it reactive towards the nucleophile. This addition is catalysed by acid.
    Reactivity of carbonyl compound towards nucleophilic addition increases with increase in the electron deficiency at carbonyl carbon. Thus, ($$-I.E.$$) group increase while ($$+I.E.$$) groups decrease the reactivity of carbonyl compound.

    ...view full instructions

    Which among the following carbonyl compound is most polar ? 

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