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(A) alpha-Hydrogen atoms in aldehdes and...

(A) `alpha`-Hydrogen atoms in aldehdes and ketones are acidic.
(R) The anion left after the removal of `alpha`-hydrogen from carbonly compounds is stabilized by the electron withdrawing carbonyl group.

A

Both (A) and (R) are true and (R) is the correct explanation of (A)

B

Both (A) and (R) are true and (R) is not the correct explanation of (A)

C

(A) is true but (R) is false

D

Both (A) and (R) is false

Text Solution

Verified by Experts

The correct Answer is:
C
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(A) Acetic acid does not give haloform test. (R) Acetic acid has no alpha -hydrogen.

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Aldehydes and ketons are susceptible to nuclephlic addition because carbonylgroup Polar (due to electronegativeity difference between carbon and oxygen positive charge on carbonyl compound towards nucleophilic . this addition is catalysed by acid . REactivity of carbonyl compound towards nuclephilic addotion increase with increase in teh electron deficiency at carbonyl carbon Thus (-I.E ) groups increase while (+I.E ) groups decreases the reactivity of carbonyl compound . select the least reactive carbonyl compound towards nuclephilic addition .

Aldehydes and ketons are susceptible to nuclephlic addition because carbonylgroup Polar (due to electronegativeity difference between carbon and oxygen positive charge on carbonyl compound towards nucleophilic . this addition is catalysed by acid . REactivity of carbonyl compound towards nuclephilic addotion increase with increase in teh electron deficiency at carbonyl carbon Thus (-I.E ) groups increase while (+I.E ) groups decreases the reactivity of carbonyl compound . which among the following carbonyl compound is most polar ?

Aldehydes and ketons are susceptible to nuclephlic addition because carbonylgroup Polar (due to electronegativeity difference between carbon and oxygen positive charge on carbonyl compound towards nucleophilic . this addition is catalysed by acid . REactivity of carbonyl compound towards nuclephilic addotion increase with increase in teh electron deficiency at carbonyl carbon Thus (-I.E ) groups increase while (+I.E ) groups decreases the reactivity of carbonyl compound . Carbonyl compounds show nucleophilic addition with :

Aldehydes and ketons are susceptible to nuclephlic addition because carbonylgroup Polar (due to electronegativeity difference between carbon and oxygen positive charge on carbonyl compound towards nucleophilic . this addition is catalysed by acid . REactivity of carbonyl compound towards nuclephilic addotion increase with increase in teh electron deficiency at carbonyl carbon Thus (-I.E ) groups increase while (+I.E ) groups decreases the reactivity of carbonyl compound . which among the following isomeric compound is most reactive towards nucleophilic addition

Aldehydes and ketons are susceptible to nuclephlic addition because carbonylgroup Polar (due to electronegativeity difference between carbon and oxygen positive charge on carbonyl compound towards nucleophilic . this addition is catalysed by acid . REactivity of carbonyl compound towards nuclephilic addotion increase with increase in teh electron deficiency at carbonyl carbon Thus (-I.E ) groups increase while (+I.E ) groups decreases the reactivity of carbonyl compound . which among the following is most reactive towards nuclephilic addition

(A) : With KMnO_(4)//H^(+) , tertiary alcohols are oxidised to ketones . (R) : Tertiary alcohols do not contain alpha - hydrogen .

AAKASH SERIES-ALDEHYDES AND KETONES-Objective exercise -4 (Assertion (A) & Reason (R) Type Questions :)
  1. (A) Among the carbonyl compounds, formaldehyde is the most reactive to...

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  2. (A) Fridel-Crafts acylation gives an aromatic ketone from benzene (...

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  3. (A) : Acetaldehyde forms hemiacetal with CH(3) OH in the presence of ...

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  4. (A) : Acetone gives yellow precipitate with iodine and alkali (R) : ...

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  5. (A) : To prepare aldehydes from primary alcohols , acidified KMnO4 " ...

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  6. (A) : Acetaldehyde and acetone can be distinguished by using 2,4 DNP....

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  7. (A) alpha-Hydrogen atoms in aldehdes and ketones are acidic. (R) The...

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  8. (A) Benzaldehyde is more reactive than acetaldehyde towards nucleophil...

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  9. (A) 2,2-Dimethylpropanal undergoes Cannizzaro reaction with conc. NaOH...

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  10. (A) Benedicts reagent can be used to distinguish benzaldehyde from ace...

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  11. (A) Aldol condensation of acetone can be catalysed both by acid (or) b...

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  12. (A) Aldehydes are reduced to alkanes in the presence of Zn/Hg and Conc...

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  13. (A) Aromatic aldehydes are more reactive than aliphatic aldehydes. (...

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  14. (A) R-overset(O)overset(||)(C)-Cl fails to give ketone when treated wi...

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  15. (A) Aldehydes on reaction with hydroyxl amine to form aldoximes. (R)...

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  16. (A) Aldehydes & ketones on shaking with a saturated solution of NaHSO(...

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  17. (A) Reaction of benzaldehyde with formaldehyde in presence of base is ...

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  18. (A) C Cl(3)-CHO on treatment with an alkali to form chloroform and for...

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  19. (A) Acetic acid does not give haloform test. (R) Acetic acid has no ...

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  20. Anhydroys CrO(3) is a mild oxidant and it can oxidise

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