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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 151. |
Identify `(A)` and `*(B)` in the reaction A. a.B. b.C. c.D. d. |
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Answer» Correct Answer - C Acidic `KMnO_(4)` breaks the double bond and also oxidises `2^(@)` alcohol to ketone, whereas `PC C` only oxidises `2^(@)` alcohol to ketone. So the answer is `(c )`. |
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| 152. |
Write equation showing the conversion of Acetic acid to Acetyl chloride. |
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Answer» acetic acid reacts with `PCl_(3)` (or) `PCl_(5)` (or) `SOCl_(2)` to form acetyl chloride `CH_(3)COOH + SOCl_(2) to underset("acetylchlorid")(CH_(3)COCl + SO_(2)) + HCl` |
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| 153. |
The compound `Me_(3)C-NH_(2)` on oxidation with acidic `KMnO_(4)` gives:A. a.B. b.C. c.D. d. |
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Answer» Correct Answer - D Acidic `KMnO_(4)` oxidises `(-NH_(2))` group to `(-NO_(2))` group. So the answer is `(c )`. |
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| 154. |
Describe the Cannizaro reaction |
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Answer» Cannizaro reaction : On treating with concentrated alkali, aldehydes which do not have any `alpha`-hydrogen atom, undergo self oxidation and reduction (disproptionation) reaction. This reaction is called cannizaro reaction. `to` As a result , one molecules of aldehyde is reduced to alcohol while another is oxidised to carboxylic acid salt. For example `H-overset(H)overset(|)C=O+H-overset(H)overset(|)C=O overset("Conc. NaOH")to underset("Methanol")(H-underset(H)underset(|)overset(H)overset(|)C-OH)-underset("Sodium methanoate")(underset(ONa)(+HC=O))` |
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| 155. |
Explain the Aldol term. Give an example of the reaction . |
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Answer» Aldol When an aldehyde ((or) Ketone) having at least one `alpha`-hydrogen atom undergo a reaction in the presence of dilute alkali as catalyst to form aldol (or) `beta`- hydroxy aldehydes ((or) ketals in case of ketones ), the reaction is called aldol condensation. For example : `underset("Ethanal")(2CH_(3)-CHO)overset("Dil. NaOH")to underset("3-hydroxyl butonal (Aldol)")(overset(4)(CH_(3))-underset(OH)underset(|)-overset(3)CH-overset(2)CH_(2)-overset(1)CHO)` |
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| 156. |
Compare the acidic strength of acetic acid, Chloroacetic acid, benzoic acid and Phenol. |
| Answer» `underset((C_(6)H_(5)COOH))("Benzoic acid ") gt underset((ClCH_(2)COOH))("Chloro acetic acid" ) gt underset((CH_(3)COOH))("Acetic acid") gt underset((C_(6)H_(5)OH))("Phenol")` | |
| 157. |
Name the reagents used in the Oxidation of primary alcohol to carboxylic acid reaction. |
| Answer» The reagents used for the oxidation of `1^(@)`-alcohols to carboxylicated are acidified `K_(2)Cr_(2)O_(7)` (or) Acidic/alkaline `KMnO_(4)` (or) Neutral `KMnO_(4)`. | |
| 158. |
List the reagents needed to reduce carboxylic acid to alcohol. |
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Answer» The Reagents needed to reduce carboxylic acid to alcohol are i) `LiAlH_(4)//"Ether (or) " B_(2)H_(6) " " ii) H_(3)O^(+)` |
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| 159. |
Classify the as primary , secondary and tertiary alcohols. |
| Answer» Correct Answer - Tertiary alcohols | |
| 160. |
Classify the `CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)C-CH_(2)OH` as primary , secondary and tertiary alcohols. |
| Answer» Correct Answer - Primary alcohols | |
| 161. |
Classify the following as primary, secondary and tertiary alcohols: (i) `CH_(3) - overset(CH_(3)) overset (|) underset (CH_(3)) underset(|) C - CH_(2)OH ` (ii) `H_(2)C = CH- CH_(2) OH` |
| Answer» Correct Answer - Secondary alcohols | |
| 162. |
Silica gel is used for keeping away the moisture because it A. adsorbs waterB. absorbs water C. reacts with waterD. none of the above |
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Answer» Correct Answer - A Silica gel is highly polar adsorbent and absorbs water . |
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| 163. |
When one of the following hydrocarbon is burnt in excess of oxygen, the volume of `CO_(2)` evolved is just three times to that of hydrocarbon taken. The hydrocarbon isA. `CH_(4)`B. `C_(2)H_(6)`C. `C_(2)H_(2)`D. `C_(3)H_(6)` |
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Answer» Correct Answer - D `underset(1 "vol.")(C_(3)H_(6) + 4 (1)/(2) O_(2)) to underset( 3 "vol.")(3CO_(2) + 3H_(2)O)` |
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| 164. |
Write the structures of the Di-Sec. butyl ketone compound. |
| Answer» `CH_(3)CH_(2)overset(CH_(3))overset(|)CH-overset(O)overset(||)C-overset(CH_(3))overset(|)CH-CH_(2)CH_(3)` | |
| 165. |
Pick up the correct stament :A. The boling points of alkly halides are more than those of the corresponding alkances .B. In water , the solulity of ` CH_3OH gt C_2H_5OH gt C-6H_5OH`.C. `C_6H_5NH_2` is a weaker base thann ` NH_3`.D. All the above statements are correct . |
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Answer» Correct Answer - D All statements are correct and self explanatory . |
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| 166. |
Give name of the reagents to bring about the Cyclohexanol to cyclohexanone. |
| Answer» `K_(2)Cr_(2)O_(7)` in acidic medium | |
| 167. |
Give name of the reagents to bring about the Ethanenitrile to ethanal. |
| Answer» (Diisobutyl) aluminium hydride (DIBAL-H) | |
| 168. |
Which of the following reactions is//are correct?A. a.B. b.C. c.D. d. |
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Answer» Correct Answer - A::B::C::D a. `CrO_(3)//MeCOOH`, selectively oxidises `(C=O)` bond, so the product is correct. b. Jones reagent `(H_(2)CrO_(4)+ "aqueous acetone")` oxidies `1^(@)` and `2^(@)` alcohols to aldehydes and ketones, respectively, but does not oxidise `(C=C)` bond, so the product is correct. `MnO_(2)` oxidies only allylic or benzylic hydroxyl group, so no reaction takes place. c. `SeO_(2)//MeCOOH` selectively hydroxylate allylic position, and simultaneously converts active methylene group to `(-CHO)` group, so the product is correct. d. The ring `(B)` containing `EWG` (e.g., `(-NO_(2))` group) is stable and therefore does not undergo oxidation, while ring `(A)` is oxidised. The ring `(B)` containing `EDG` (e.g.,`(-NH_(2))` group) is unstable and undergoes oxidation. So both the products are correct. So the answers are `(a), (b), (c )`, and `(d)`. |
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| 169. |
Which statement(s) is/are wrong? A. a.Path I is Claisen-Schmidt rearrangement reaction, whereas Path II is Hofmann bromamide rearrangement reaction.B. b.Both path proceeds via the formation of acyl nitrene as an intermediate species `(R-overset(O)overset(||)(C )-overset(..)(N): ).`C. c.In path I and Path II, the intermediate compound formed is alkyl isocynaye `(R-N=C=O)`D. d.Both the path proceed via the formation of nitrene `(R-overset(..)(N): )` as a intermediate species. |
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Answer» Correct Answer - D Statement `(a), (b)`, and `(c )` are correct, but statement `(d)` is wrong. Hence, the answer is `(d)`. |
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| 170. |
Which of the following reaction are wrong?A. B. C. D. |
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Answer» Correct Answer - A::B a. ` PhNH_2` |
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| 171. |
Which of the following statements is wrong ?A. Using Lassaignes test nitrogen and sulphur present in an organic compound can be testedB. Using Beilsteins test, the presence of halogens in a compound can be testedC. In Lassaignes filtrate, the nitrogen in an organic compound is converted to NaCN.D. In the estimation of carbon, an organic compound is heated with CaO in a combustion tube. |
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Answer» Correct Answer - D The organic compound is heated with dry CuO. And not CaO. |
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| 172. |
An organic compound on analysis gave C=39.9 % ,H= 6.7 % and O =53.4 % .The empricial formula of the compound isA. `CHO_2`B. `CH_2O`C. `C_2H_2O_2`D. CHO |
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Answer» Correct Answer - B `C=(39.9)/(12)=3.35,H=(6.7)/(1)=6.7,` O=(53.4)/(16)=3.34` `therefore E.F = CH_(2)O` |
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| 173. |
An organic compound contains carbon, hydrogen and oxygen. Its chemical analysis gave C, 38.71% and H, 9.67%. The empirical formula of compound would beA. CHOB. `CH_(4)O`C. `CH_(3)O`D. `CH_(2)O` |
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Answer» Correct Answer - C % O=100-38.71-9.67=51.62. C:H:O `=(38.71)/(12):(9.67)/(1):(51.62)/(16)=1:3:1` |
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| 174. |
How much of sulphur is present in an organic compound ,if 0.53 g of the compound gave 1.158 g of `BaSO_(4)` on analysis ?A. 0.1B. 0.15C. 0.2D. 0.3 |
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Answer» Correct Answer - D 233 g `BaSO_(4)` contains =32 g sulphur `therefore " 1.158 g " BaSO_(4) " contains " = 32/233 xx 1.158 `g `therefore " percentage of " S=32/233xx1.158 xx 100/0.53= 30%` |
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| 175. |
0.765 g of an acid gives 0.535 g of `CO_(2)` and 0138 g of `H_(2)O`. Then the ratio of the percentage of carbon and hydrogen isA. `19:2`B. `18:11`C. `70:17`D. `1:7` |
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Answer» Correct Answer - A % `C=12/44xx(0.535)/(0.765)xx100=2.004.` % `H=2/18xx(0.138)/(0.765)xx100=2.004` `therefore` C:H=19:2 approx. |
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| 176. |
Acid-catalysed hydration oxymercuration-demercu-ration, and hydroboration oxidation reaction will give the same product with:A. a.But-2-eneB. b.But-1-eneC. c.D. d. |
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Answer» Correct Answer - A a. Symmetrical alkenes on acid-catalysed hydration, oxymercuration-demercuration, and `HBO` reactions give the same product. So the answer is `(a)`. |
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| 177. |
Write structure of the compound whose IUPAC name is 3-Chloromethylpentan-1-ol. |
| Answer» `HO-overset(1)(CH_(2))-overset(2)CH_(2)-underset(CH_(2)Cl)underset(|)overset(2)(CH)-overset(4)CH_(2)-overset(5)CH_(3)` | |
| 178. |
Write any two methods for the preparation of Ketones. |
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Answer» a) `H_(3)C-C-=CH+H_(2)O underset(HgSO_(4))overset(H_(2)SO_(4))to CH_(3)-underset(OH)underset(|)C=CH_(2)hArr underset("Acetone")(CH_(3)-underset(O)underset(||)C-CH_(3))` b) `2R-MgX+CdI_(2) to R_(2)Cd+2MgXI` `2R^(1)-underset(O)underset(||)C+Cl + R_(2)Cd to 2R^(1) -underset(O)underset(||)C-R+CdCl_(2)` Acyl chlorides react with dialkyl cadmium give ketones. |
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| 179. |
`Et-N^(o+)-=C^(ɵ) underset(or HgO or O_(3))overset(Cl_(2)+DMSO)(rarr)`. The compound `(A)` is:A. a.Ethyl methyl amineB. b.`Ethyl nitrile`C. c.Ethyl isocyanateD. d.Ethyl cyanate |
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Answer» Correct Answer - C Isocyanides are oxidised to isocyanates. So the amswer is `(C )`. |
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| 180. |
Which statement(s) is/are correct?A. B. C. D. |
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Answer» Correct Answer - A::C `NaBH_(4)` reduces only the `(-CHO)` group to `(-CH_(2)OH)` group but does not reduce `(C=C)` bond. `H_(2)//Pt` reduces both the `(-CHO)` group tp `(-CH_(2)OH)` group and the `(C=C)` to `(C-C)` bond. `H_(2)//Pd//C` reduces only the `(C=C)` to `(C-C)` bond. So the answer are `(a)` and `(c )`. |
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| 181. |
An organic compound is found to have the formula `C_(5)H_(10)ONCl`. The percentage of nitogen in it isA. 20.36B. 10.3C. 44.05D. non of these |
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Answer» Correct Answer - B `underset(" "135.5g-=14g)underset(12xx5+1xx10+1xx16+1xx14+1xx35.5-=14)(" "C_5" "H_(10)" "O" "N" "Cl"-=N` 135.5 g of compound contains N=14 g ltbr 100g of compound contains `N=(14xx100)/(135.5)` = 10.3 |
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| 182. |
Examine the following two structures for the anilinium ion and choose the correct statement from the ones given below:A. (II) is not an acceptabnle canonical structure because carbionium ions are less stable than ammonium ionsB. (II) is not an acceptable canonical structure becauses it is non -aromatic .C. (II) is not an acceptable canonical structure becauses nitrogen has `10` valence eelctrons .D. (II) is an acceptable canonical structure. |
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Answer» Correct Answer - C (II) is not acceptale canonical structure because (N) has ` 10 ` valence `overline ^,s`. |
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| 183. |
The most unlikely representation of resonance structures of p-nitrophenoxide ion is:B. C. D. |
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Answer» Correct Answer - C (c ) is an unilikely structure because (N) atoms form five bonds and contain jpositice charge. |
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| 184. |
The percentage of oxygen in `CH_(2) O` isA. 0.4B. 0.066C. 0.534D. 1 |
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Answer» Correct Answer - C `CH_(2)O=O` `30 " g of " CH_(2)O " contains " O=16 g` `100 "g of " CH_(2)O " Contain "O=16/30 xx 100` =53.4 % |
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| 185. |
0.532 g of the platinitic chloric of a mono acid base left 0.195 g of plantiumas residue on ignition,.The equlivalnt weight of the base isA. 32B. 61C. 122D. 115 |
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Answer» Correct Answer - B Eq.mass `([("mass of chloroplatinate"xx195)/("mass of Pt obtained")]-410)/(2)` `([(0.532xx195)/(0.195)]-410)/(2)=61` |
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| 186. |
Among the following the strongest base isA. ` C_6 H_5 NH_2`B. `p-NO_2C_6H_4NH_2`C. `m-NO_2. C_2H_4NH_2`D. `C_6 H_5 CH_2NH_2` |
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Answer» Correct Answer - D (d) is an aliphatic amine , so it is stronger base han aromatic amine . Moreiver . ` EWG[(- No_2) at o, m, or p]` decreases the basic character , The basicity order is `(d) gt (a) gt (c ) gt (d)`. |
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| 187. |
Which of the following is the weakest base ?A. `(CH_3)_2NH`B. `(CH_3)_3N`C. `C_6H_5NH_2`D. `(CH_3)_2N^(o+)` |
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Answer» Correct Answer - C Basic order : `(CH_3) _2 NHgt (CH_3)_3N gt C_6 H_5 NHCH_3 gt C_6 H_5 NH_2`. |
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| 188. |
Which of the following are not functional isomers of each other ?A. `CH_3CH_2NO_2` and `CH_3CH_2ON=O`B. `C_2H_5CHO` and `CH_3COCH_3`C. `CH_3CH-2CH_2` and `CH_30_2 cHNH_2`D. ` C_3H_7NH_2` and `(CH_3)_2 CHNH_2` |
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Answer» Correct Answer - D `1^@` amine to different `1^@` amines are not functional isomers but `(1^@` and `2^@) (1^@` and `3^@)` and `(2^@` and `3^@)` of same molecular formula are fuctional isomers . Therfor e, (a) (b), and (c ) are functional isomers . |
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| 189. |
Which of fllowing is the weakest base ?A. ` NH_3`B. `C_6H_5NH_2`C. `C_6H_5CH_6NH_2`D. `CH_3NH_2` |
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Answer» Correct Answer - B Aromatic amines are weaker than aliphatic amines and ` NH_3`, |
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| 190. |
Give a simple test to distinguish between the compounds in each of the following paris. |
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Answer» a. and b. The aldehyde gives a position Tollens test (Ag mirror). Also in (a), only aldehyde given a precipitate with `H_(2)NOH` or `PhNHNH_(2)`. c. Only alcohol is oxidised by `CrO_(3)` (colour changes from orange red to green), alternatively, ketone gives a solid oxime or phenyl hydrazone with `H_(2)NOH` or `PhNHNH_(2)`. d. Only the aldehyde gives a positive Tollens test, ketone gives a positive iodoform test `("precipitate of" CHI_(3))` |
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| 191. |
Write structure of the products of the `CH_(3)-CH=CH_(2) overset(H_(2)O//H^(+))to` |
| Answer» `CH_(3)-underset(OH)underset(|)CH-CH_(3)` | |
| 192. |
The products `(A)` is:A. a.B. b.C. c.D. d. |
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Answer» Correct Answer - D Red `P + HI` reduces both alcohols and acids to alkanes. So the answer is `(d)`. |
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| 193. |
Write the reaction of (i) aromatic and (ii) aliphatic promary amines with nitrous acid . |
| Answer» i. `PhNH_2 + NHO_2 underset (0-5^@C) overset (HCl) (rarr) Ph -N^(o+) -= N] Cl^(Θ) + 2 H_2 O`. | |