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551.

Isobutyric acid is obtained by oxidation ofA. butanalB. 2- methyl propanalC. 2- methylpropen -1-olD. both b and c

Answer» Correct Answer - D
Discussion
552.

Propionic acid is obtained from dry ice and what?A. `CH_(3)mgI`B. `C_(2)H_(5)MgBr`C. `C_(3)H_(7)MgBr`D. None of these

Answer» Correct Answer - B
Discussion
553.

Propionic acid on bromination in the presence of red phosphorus gives 2- bromo propionic acids it showsA. optical isomersB. tautomerismC. cis- trans isomersD. metamerism

Answer» Correct Answer - A
`CH_(3) - CH_(2) - COOH + Br_(2) overset("Red P") to CH_(3)- CHBr - COOH`
It shows optical isomerism.
Discussion
554.

Propionic acid and KOH reacts to produce which one of the folliwng?A. Potassium propionateB. Propyl alcoholC. PropionaldehydeD. Does not react

Answer» Correct Answer - A
Propionic acid and KOH reacts to produce potassium propionate.
`underset("Propionic acid")(CH_(3)CH_(2)COOH) overset(KOH) to underset("Potaasium proplonate") (CH_(3)CH_(2)CO overset(-)O overset(+)K)+H_(2)O`
Discussion
555.

Mixture of acetic acid and propionic acid is obtained by oxidation ofA. B. C. D.

Answer» Correct Answer - B
Discussion
556.

Acetic acid be obtained on oxidation ofA. ethanolB. propanalC. methanalD. glyoxal

Answer» Correct Answer - A
`underset("Ethanol") (C_(2)H_(5)OH)+[O] overset("Alkaline"KMnO_(4)) to underset("Acetic acid")(CH_(3)COOH)`
Discussion
557.

Vinegar contains acetic acid nearlyA. `6 - 10%`B. `30%`C. `12 - 15%`D. `20%`

Answer» Correct Answer - A
Discussion
558.

Base catalysed aldol condensation occurs withA. propanalB. butanalC. ethanalD. all of these

Answer» Correct Answer - D
Aldol condensation reaction shown by those aldehydes and ketones containing `alpha` hydrogen atoms or aldehydes and ketones having methyl or methylene group in `alpha` position.
Compounds a,b, c have `alpha` - hydrogen atoms.
Discussion
559.

Aldol condensation will not take place inA. HCHOB. `CH_(3)CHO`C. `CH_(3)COCH_(3)`D. `CH_(3)CH_(2)CHO`

Answer» Correct Answer - A
Discussion
560.

Cross aldol condensation occurs betweenA. two same aldehydesB. two same ketonesC. two different aldehydes and ketonesD. None of the above

Answer» Correct Answer - C
Aldol condensation is given by those aldehydes and ketones which have at least one `alpha`- atom. When this reaction takes place between two different aldehydes and ketones it is called cross aldol condensation.
Discussion
561.

The compound that neither forms semicarbazone nor oxime isA. HCHOB. `CH_(3)CONHCH_(3)`C. `CH_(3)COCH_(2)Cl`D. `CH_(3)underset(CH_(3))underset(|)(CHCHO)`

Answer» Correct Answer - B
`CH_(3)CONHCH_(3)` neither forms semicarbazone nor oxime because it is a substituted amide
It is not `alpha` carbonyl compound.
Discussion
562.

Identify the produce `C` in the series `CH_(3) CN overtset (Na C_(2) H_(5) OH) to A overset (HNO_(2)) to B overset ("Tollent reagent") to C`A. `CH_(3) COOH`B. `CH_(3) CH_(2) NHOH`C. `CH_(3) CONH_(2)`D. `CH_(3) CHO`

Answer» Correct Answer - D
Discussion
563.

Give decreasing order of the following towards NA reaction. I. II. III. IV. A. (I) gt (II) gt (III) gt (IV)B. (IV) gt (III) gt (II) gt (I)C. (II) gt (III) gt (IV) gt (I)D. (I) gt (IV) gt (III) gt (II)

Answer» Correct Answer - C
All are aldehydes `-1` effect of `CI at C-2 gt at C-3 gt at C - 4` more the `-1` effect , more rective is the tedency of aldhyde towards `NA`reaction `[(II)gt (III) gt (III) gt (IV)gt (I)]`.
Discussion
564.

Carboxylic acid canA. decompose carbonate and evolve `CO_(2)`B. reacts with metal forming `H_(2)` gasC. neutralise ammonium hydroxide form saltD. all of the above

Answer» Correct Answer - D
Discussion
565.

Which of the following presents the correct order of the acidity in the given compounds?A. `CH_(3) COOH lt BrCH_(2)COOH lt CICH_(2)COOH lt FCH_(3)COOH`B. `FCH_(2)COOH gt CH_(3)COOH gt BrCH_(2)COOH gt CICH_(2)COOH`C. `BrCH_(2)COOH gt CICH_(3)COOH gt FCH_(2)COOH gt CH_(3)COOH`D. `FCH_(3)COOH gt CICH_(2)COOH gt BrCH_(2)COOH gt CH_(3)COOH`

Answer» Correct Answer - D
Discussion
566.

Which of the following group will increase more acidity of acetic acid ?A. `- NO_(2)`B. ` - CH_(3)`C. `CH_(3) O - `D. `- NH_(2)`

Answer» Correct Answer - A
Discussion
567.

Cinnamci acid is fomed when `C_(6)H_(5)-CHO` condenses with `(CH_(3)CO_(2))O` in the presence ofA. concentreated `H_(2)SO_(4)`B. sodium acetateC. sodium metalD. anhydrous `ZnCl_(2)`

Answer» Correct Answer - B
When `C_(6)CHO` condneses with `(CH_(3)CO_(2))` O in the presence of sodium acetate then cinnamci aciod is formed. This reaction is called Perkin reaction
`underset("Benzaldehyde")(C_(6)H_(5)-CHO)+ underset("Acetic anhydride")((CH_(3)CHO)_(2)O)overset(CH_(3)CO overset(-)O overset(+)Na) underset(100^(@)C)to underset("Cinnamic acid")(C_(6)H_(5)CH=CHCOOH)+CH_(3)COOH`
Discussion
568.

Among the following, which compound is most acidic ?A. `CH_(3)CH_(2)COOH`B. `(CH_(3))_(2)CH-COOH`C. `HCOOH`D. `CH_(3)COOH`

Answer» Correct Answer - C
Out of the given acid, strongets is HCOOH highest `K_(a)` value. Since `pK_(a)=- log K_(a)`
Thus lowest `pK_(a)` is of `HCOOH`.
Discussion
569.

Among the following , the most acicid isA. `CH_(3)COOH`B. `ClCH_(2)COOH`C. `Cl_(2)CHCOOH`D. `Cl_(2)CHCH_(2)COOH`

Answer» Correct Answer - C
Proton donors are acids. Electron withdrawing groups increases acidity. More the number of electron withdrawing acidity. More number of electron withdrawing groups, more will be the acidity. Closer the electron withdrawing group to proton, more will be acidity.
`:. Cl_(2)CHCOOH`, has highest acidity among these.
Discussion
570.

Which gives lactic acid on hydrolysisafter reacting with `HCN`?A. `HCHO`B. `CH_(3) CHO`C. `C_(6) H_(3) CHO`D. `CH_(3) COCH_(3)`

Answer» Correct Answer - B
`CH_(3) CHO overset (HCN) to CH_(3) CH (OH) CN`
`overset (2 H_(2) OH^(+)) to CH_(3) CH (OH) COOH`
Discussion
571.

The reagent which does not give acid chloride on treating with a carboxylic acid isA. `PCl_(5)`B. `Cl_(2)`C. `SOCl_(2)`D. `PCl_(5)`

Answer» Correct Answer - B
`PCl_(3) , PCl_(5) and SOCl_(2)` are used to replace3 -OH group of an alcohol or an acid by -Cl group
`R-overset(O)overset(||)C-OH+PCl_(5) to R-overset(O)overset(||)C-Cl+POCl_(3)+HCl`
`R-overset(O)overset(||)C-OH+SOCl_(2) to R-overset(O)overset(||)C-Cl+SO_(2)+HCl`
When acid react with `Cl_(2)` in the presence of red phosphorus, `alpha`-chloroacid is obtained.
(Hell. volharzd-Zelinsky reaction).
`CH_(3)CH_(2)COOH+Cl_(2) overset("Red P") underset(Delta)tounderset(alpha-"chloropropioni acid") overset(Cl) overset(|)(CH_(3)CHCOOH)+HCl`
Discussion
572.

Which of the following is mixed ketone?A. PentanoneB. AcetophenoneC. BenzaphenoneD. Butanone

Answer» Correct Answer - B
Discussion
573.

Which gives lactic acid on hydrolysis after reacting with `HCN`?A. `HCHO`B. `CH_(3)CHO`C. `C_(6)H_(5)CHO`D. `CH_(3)COCH_(3)`

Answer» Correct Answer - B
`underset("Acetaldehyde")overset(O) overset(||)(CH_(3)-C-H+)HCN to CH_(3) overset(OH) overset(|) underset(H)underset(|)(CH_(3)-C-CN)overset (H_(2)O)to underset("Lactic acid") underset(H) underset(|) overset(OH) overset(|)(CH_(3)-C-COO)H`
Discussion
574.

The reaction of acetaldehyde with HCN followed by hydrolysis gives a product which exhibitsA. Optical isomerismB. Geometrical isomerismC. MetamerismD. Tautomerism

Answer» Correct Answer - A
Discussion
575.

Given reason : pH of reaction should be carefully controlled while preparing ammonia derivatives of carbonyl compounds.

Answer»

In strongly acidic medium ammonia derivatives being basic will react with acids and will not react with carbonyl compound. In basic medium, OH– will attack carbonyl group.

Therefore, pH of a reaction should be carefully controlled.
Discussion
576.

In the following resonating structures A and B, the number of unshared electrons in valence shell present on oxygen respectively area. 2, 4b. 2, 6c. 4, 6d. 6, 4

Answer»

Correct answer is

c. 4, 6
Discussion
577.

1,1 - dichlorocyclohexane on alkaline hydrolysis givesA. cyclohexane carbaldehydeB. cyclohexanoneC. benzophenoneD. cyclohexane carboxylic acid

Answer» Correct Answer - B
Discussion
578.

Assertion: Acetal are easily converted to present carbonyl compound. The easy intergoconversion makes acetal attractive as protecting grouo of prevent carbonyl compound. Reason : Acetal are easily hydrolyses in acidic as well as basic medium.A. If Both assertion and reason are true reason is the correct explation of the assertion.B. If Both assertion and reason are true but reason is not the correct explation of the assertion.C. If assertion is true but reason is false.D. If assertion is false but reason is true.

Answer» Correct Answer - C
Acetals are not hydrolysed in basic medium.
Discussion