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(A) Aldol condensation of acetone can be...

(A) Aldol condensation of acetone can be catalysed both by acid (or) base.
(R) `beta`-Hydroxyaldehyde readily undergo acid-catalysed dehydration.

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:
B
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When a salt reacts with water to form acidic (or ) basic solution the process is called salt hydrolysis. The P^(H) of salt solution can be calculated using the following relation P^(H) =(1)/(2) [P^(k_w) +P^(Ka) + log C ] for salt of weak acid and strong base. P^(H) =(1)/(2) [P^(K_w) -P^(K_a) -log C ] for salt of weak base and strong acid , P^(H) =(1)/(2) [P^(K_w) +P^(K_a) - P^(K_b) ] For a salt of weak acid and weak base where .c. represents the concentration of salt . When a weak acid (or) a weak base is not completly neatralised by strong base (or ) strong acid respectively, then formation of buffer takes places. The P^(H) of buffer solution can be calculated using the following relation P^(H) =P^(Ka) +log "" ((["salt")])/(["Acid "]) , P^(OH) =P^(Kb) +log ""(["salt"])/(["base"]) Answer the following questions using the following data pK_a (CH_3COOH) =4.7447 , pK_b (NH_4OH) =4.7447 , P^(K_W) =14. One mole CH_3 COOH and one mole CH_3 COONa are dissolved in water one litre aqueous solution The P^(H) of the resulting solution will be

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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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