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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. |
Glycerol can be obtained fromA. FatsB. PropyleneC. BothD. None |
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Answer» Correct Answer - C From fats and propylene both. |
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| 152. |
Addition of water to 3-methylbut-1-ene in the presence of dil. `H_(2)SO_(4)` gives mainlyA. 3-Methylbutan-1-olB. 3-Methylbutan-2-olC. 2-Methylbutan-1-olD. 2-Methylbutan-2-ol |
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Answer» Correct Answer - D `underset("3-Methylbut-1-ene")(CH_(3)-underset(CH_(3))underset(|)(CH)-CH=CH_(2))overset(H^(+))rarr` `CH_(3)-underset((2^(@)))(underset(CH_(3))underset(|)(CH))-overset(+)(CH)=CH_(3)overset("Hydride shift")rarr` `CH_(3)-underset(3^(@))underset(CH_(3))underset(|)overset(+)(C)-CH_(2)-CH_(3)overset(OH^(-))rarrunderset("2-Methylbutan-2-ol")(CH_(3)-underset(CH_(3))underset(|)overset(OH)overset(|)(C)-CH_(2)-CH_(3))` |
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| 153. |
The product `{:(CH_(2)OOC CH_(3)),("|"),(CH_(2)OOC CH_(3)):}` is obtained by the reaction ofA. Acetone and GlycolB. Ethanal and EthanolC. Glycol and `CH_(3)COCl`D. Glycerol and `(CH_(3)CO)_(2)O` |
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Answer» Correct Answer - C Glycol and `CH_(3)COCl` |
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| 154. |
Widespread deaths due to liquor poisoning is because ofA. Presence of bad compound in liquorB. Presence of methyl alcoholC. Presence of ethyl alcoholD. Presence of carbonic acid |
| Answer» Correct Answer - B | |
| 155. |
Alcohols can be prepared by which of the following methods ?A. By hydrolysis of alkenesB. By reduction of carbonyl compoundsC. By reaction of primary aliphatic amines with nitrous acidD. By hydrolysis of esters. |
| Answer» Correct Answer - A::B::C::D | |
| 156. |
Match the chemical conversions in Column I with the appropriate reagents in Column II and select the correct answer using the code given below the lists. A. P = 2, Q = 3, R = 1, S = 4B. P = 3, Q = 2, R = 1, S = 4C. P = 2, Q = 3, R = 4, S = 1D. P = 3, Q = 2, R = 4, S = 1 |
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Answer» Correct Answer - (a) It is correct answer. `(##SKM_COMP_CHM_V02_XII_C12_1_E01_254_A01##)` |
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| 157. |
Phenol is less acidic thanA. Acetic acidB. p-MethoxyphenolC. p-NitrophenolD. Ethanol |
| Answer» Correct Answer - A::C | |
| 158. |
When few drops of glycerol is put on powdered `KMnO_(4)`A. it becomes colourlessB. pungent smell of acrolein is producedC. it is oxidised to tartronic acidD. None of these |
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Answer» Correct Answer - D When a few drops of glycerol is put on powdered `KMnO_(4)` it catches fire due to highly exothermic spontaneous reaction producing `CO_(2)` and water. |
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| 159. |
Which one is the most acidic compound?A. B. C. D. |
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Answer» Correct Answer - C 2, 4, 6-trinitrophenol is the most acidic since it has three electron withdrawing `-NO_(2)` groups present. |
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| 160. |
The finalproduct of the reaction, A. B. C. D. |
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Answer» Correct Answer - A The final is -hydroxy benzaldehyde formed as a result of Reimer Tiemann reaction. |
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| 161. |
In the reaction the electrophile involved isA. dichloromethyl cation `(underset(+)(C)HCl_(2))`B. formyl cation `(underset(+)(C)HO)`C. dichloromethyl anion `(underset(-)(C)HCl_(2))`D. dichorocarbene `( : C Cl_(2))` |
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Answer» Correct Answer - D It is an example of Reimer Tiemann reaction. The electrophile involved in the reaction is dichlorocarbene `( : C Cl_(2))` and is formed as follows : `{:(CHCl_(3),+,OH^(-),hArr,overset(..)(C)Cl_(3)+H_(2)O),(,,,,darr-Cl^(-)),(,,,,:C Cl_(2)),(,,,,"Dichlorocarbene (electrophile)"):}` |
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| 162. |
Which of the following is correct ?A. Reduction of any aldehyde gives secondary alcoholB. Reaction of vegetable oil with `H_(2)SO_(4)` gives glycerine.C. Alcoholic iodine with `NaOH` gives iodoform.D. Sucrose on reaction with `NaCl` gives invert sugar. |
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Answer» Correct Answer - C `underset("Ethyl alcohol")(CH_(3)CH_(2)OH)+3I_(2)+4NaOH underset(I_(2))overset("Alcoholic")rarr underset("Iodoform")(CHI_(3))+HCOONa +3NaI+3H_(2)O` |
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| 163. |
The electrophile involved in the above reaction isA. dichloromethyl cation `(overset(+)(C)HCl_(2))`B. Dichloro carbene `( :CH_(2))`C. trichloro methylanion `(overset(-)(C) Cl_(3))`D. formyl cation `(overset(+)(C)HO)` |
| Answer» Correct Answer - B | |
| 164. |
Benzyl amine reacts with nitrous acid to formA. azobenzeneB. benzeneC. benzyl alcoholD. phenol |
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Answer» Correct Answer - C `underset("Benzylamine")(C_(6)H_(5)CH_(2)NH_(2))+HONO_(2) rarr underset("Benzyl alcohol")(C_(6)H_(5)CH_(2)OH)+N_(2)+H_(2)O` |
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| 165. |
The structure of the compound that gives a trobromo derivative on treatment with bromine water isA. B. C. D. |
| Answer» Correct Answer - A | |
| 166. |
Methlamine on treatment with nitrous acid givesA. Methyl alcoholB. Methyl nitriteC. Dimethyl etherD. both (B) and (C ) |
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Answer» Correct Answer - D Methyl amine with nitrous acid do not give any methyl alcohol. |
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| 167. |
Action of nitrous acid on ethylamine givesA. `C_(2)H_(6)`B. `C_(2)H_(5)OH`C. `C_(2)H_(5)OH` and `C_(2)H_(4)`D. `C_(2)H_(5)OH` and `NH_(3)` |
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Answer» Correct Answer - B `C_(2)H_(5)-NH_(2)overset(HNO_(2))rarrC_(2)H_(5)OH+N_(2)+H_(2)O` |
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| 168. |
Give chemical test to distinguish between |
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Answer» (i) Add a few drops of blue litmus separately to the solutions of both the compounds taken in two test tubes. The solution which changes the colour of blue litmus to red is that of phenol. The solution which does not bring about any colour change is that of cyclohexanol. (ii) Treat both the solutions separately with Lucas reagent which is a mixture of `HCl (g)` and anhydrous `ZnCl_(2)`. The compound that gives white fumes after sometime is propan-2-ol while the other is benzyl alcohol |
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| 169. |
A compound [A] with molecular formula `C_(4)H_(10)O` reacts rapidly with metallic sodium but very slowly with Lucas reagent. When [A] treated with hot concentrated `H_(2)SO_(4)`, it gives a compound [B] `C_(4)H_(8)` which upon hydration with aqueous `H_(2)SO_(4)` forms a compound [C] with molecular formula `C_(4)H_(10)O`. The compound [C] is almost unert to metallic sodium but reacts rapidly with Lucas reagent. What are the compounds [A], [B] and [C] ? Explain the reaction involved. |
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Answer» (i) As the compound [C] is almost inert towards sodium metal but reacts rapidly with Lucas reagent, it is a tertiary alcohol. (ii) The molecular formula `C_(4)H_(10)O` suggests alcohol to be tertiary nutyl alcohol i.e. `(CH_(3))_(3)COH`. Since [C] has been formed by the hydration of compound [B] which is an alkene, the compound [B] is therefore, `(CH_(3))_(2)C=CH_(2)`. (iii) The compound [B] has been formed from [A], as a result of dehydration with concentrated `H_(2)SO_(4)`. since compound [A] reacts rapidly with metallic sodium but very slowly with Lucas reagent, it is a primary alcohol with the formula `(CH_(3))_(2)CHCH_(2)OH`. The series of reactions involved are as follows : `underset(("Isobutyl alcohol "(C_(4)H_(10)O)),([A]))((CH_(3))_(2)CHCH_(2)OH) underset("Heat")overset(H_(2)SO_(4)" (conc.)")(rarr) underset(("Isobutylene "(C_(4)H_(8))),([B]))((CH_(3))_(2)C=CH_(2)) overset(H_(2)O //H^(+))(rarr) underset(("Tert. butyl alcohol "(C_(4)H_(10)O)),([C]))((CH_(3))_(3)COH)` |
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| 170. |
Which of the following alcohols is least soluble in water?A. `CH_(3)OH`B. `C_(2)H_(5)OH`C. `CH_(3)(CH_(2))_(4)OH`D. All are equally soluble. |
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Answer» Correct Answer - C `CH_(3)(CH_(2))_(4)OH`, due to larger Non-polar part. |
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| 171. |
Which of the following compound does not react with metallic sodium?A. `CH_(3)CH(OH)CH_(3)`B. `CH_(3)-O-CH_(3)`C. `CH_(3)COOH`D. `C_(2)H_(5)OH` |
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Answer» Correct Answer - B Ethers donot react with metallic sodium. |
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| 172. |
The best method to convert crotonaldehyde into crotonyl alcohol isA. `Ni//H_(2)`B. `NaBH_(4)`C. `LiAlH_(4)`D. Both B and C |
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Answer» Correct Answer - D `underset("Crotonaldehyde")(CH_(3)-CH=CH-CHO) underset(NaBH_(4) or LiAlH_(4))overset(+2[H])rarr underset("Crotonyl alcohol")(CH_(3)-CH=CH-CH_(2)OH)` |
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| 173. |
Cannizzaro reaction of `C_(6)H_(5)CHO` in the presence of `NaOH` givesA. `C_(6)H_(5)COONa+C_(6)H_(5)CH_(2)OH`B. `C_(6)H_(5)COONa+HCOONa`C. `C_(6)H_(5)COONa+C_(6)H_(5)OH`D. `C_(6)H_(5)OH+CH_(3)COONa` |
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Answer» Correct Answer - C `2C_(6)H_(5)CHO+NaOH rarr C_(6)H_(5)COONa+C_(6)H_(5)CH_(2)OH` |
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| 174. |
An industrial method of preparation of methanol is :A. Catalytic reduction of carbon monoxide in the presence of `ZnO-Cr_(2)O_(3)`B. by reacting methane with steam at `900^(@)C` with a nickel catalystC. by reducing formaldehyde with lithium aluminium hydrideD. by reacting formaldehyde with aqueous sodium hydroxide solution. |
| Answer» Correct Answer - A | |
| 175. |
Methanol is soluble in water due toA. covalent bond natureB. hydrogen bondingC. ionic acid natureD. its poisonous nature |
| Answer» Correct Answer - B | |
| 176. |
Which of the following compounds should be least soluble in water?A. PhenolB. EthanolC. Benzoic acidD. Chlorobenzene |
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Answer» Correct Answer - D Chlorobenzene does not form hydrogen bonds with water. It is therefore insoluble in water. |
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| 177. |
Write the structure of 4, 4-dimethylpentan-2-ol. |
| Answer» `{:(" "CH_(3)),(" |"),(CH_(3)-C-CH_(2)-CH-CH_(3)),(" |"" |"),(" "CH_(3)" "OH):}` | |
| 178. |
Which of the following is a primary alcohol ?A. neo-Pentyl alcoholB. sec-Pentyl alcoholC. tert-Pentyl alcoholD. None of these |
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Answer» Correct Answer - A `underset(("Neopentyl alcohol is a" 1^(@) "alcohol"))(CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)C-CH_(2)OH` |
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| 179. |
Which of the following alcohols is least soluble in water?A. `CH_(3)OH`B. `C_(2)H_(5)OH`C. `n-C_(3)H_(7)OH`D. `n-C_(4)H_(9)OH` |
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Answer» Correct Answer - D Solubility of monohydric alcohols in water decreases with increase in molecular masses. |
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| 180. |
Alcohols are comparatively more soluble in water than hydrocarbons of comparable melecular masses. Explain this fact. |
| Answer» Intermolecular hydrogen bonding is present in the molecules of alcohol and water while the same is absent in the molecules of hydrocatbon and water. As a result, alcohols are more soluble in water as compared to hydrocarbons which are almost water insoluble. | |
| 181. |
Which of the following alcohols is most soluble in water?A. n-Butyl alcoholB. Isobutyl alcoholC. sec-Butyl alcoholD. tert-Butyl alcohol |
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Answer» Correct Answer - D Solubility of alcohols in water increases with increase in their branching in alkyl groups. |
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| 182. |
Which of the following alcohols is the least soluble in water?A. EthanolB. 1-PropanolC. 1-ButanolD. 1-Pentanol |
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Answer» Correct Answer - D Solubility of alcohol in water decreases with increase in their molecular masses. |
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| 183. |
An isomer of ethanol isA. MethanolB. EthanalC. EthoxyethaneD. Methoxymethane |
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Answer» Correct Answer - D `underset("Ethanol")(CH_(3)CH_(2)OH) " " underset("Methoxymethane")(CH_(3)OCH_(3))` |
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| 184. |
How many isomers of `C_(5)H_(11)OH` will be primary alcohols?A. 5B. 2C. 4D. 3 |
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Answer» Correct Answer - C (i) `H_(3)C-CH_(2)-CH_(2)-CH_(2)-CH_(2)-OH`, (ii) `CH_(3)-CH_(2)-underset(CH_(2))underset(|)(CH)-CH_(2)-OH`, (iii) `CH_(3)-underset(CH_(3))underset(|)(CH)-CH_(2)-CH_(2)-OH` (iv) `CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C)-CH_(2)-OH` |
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| 185. |
How many isomeric primary alcohols are possible for `C_(4)H_(9)OH` ?A. 1B. 2C. 3D. 4 |
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Answer» Correct Answer - B Two primary alcohols possible for `C_(4)H_(9)OH` n-Butyl alcohol and isobutyl alcohol. |
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| 186. |
How many isomeric compounds are possible for `C_(4)H_(10)O` ?A. 4B. 5C. 6D. 7 |
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Answer» Correct Answer - D Four isomeric alcohols+three isomeric ethers. |
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| 187. |
Which one has highest boiling point ?A. Butan-2-olB. EthaneC. ButaneD. Pentane |
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Answer» Correct Answer - A Alcohols have higher boiling points than alkane due to H-Bonding. |
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| 188. |
Which of the following alcohols is expected to have a highest boiling point ?A. n-ButanolB. IsobutanolC. sec-ButanolD. tert-Butanol |
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Answer» Correct Answer - A Among the isomeric alcohols the primary alcohol (largest surface area) has the highest boiling point and the tertiary (having the smallest surface area) the lowest, with the secondary having an intermediate value. |
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| 189. |
Which of the following has the highest boiling point?A. diethyl etherB. n-ButylraldehydeC. n-butylacoholD. n-propylchloride |
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Answer» Correct Answer - C n-Butyl alcohol-due to inter molecular hydrogen bonding. |
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| 190. |
The function of `ZnCl_(2)` in Lucas test for alcohols isA. to act as acid catalyst and react with `HCl` to form `H_(2)ZnCl_(2)`B. to act as base catalyst and react with NaOH to form `Na_(2)Zn(OH)_(4)`C. to act as an amphoteric catalystD. to act as an neutral catalyst |
| Answer» Correct Answer - D | |
| 191. |
Assertion : Lucas reagent is a mixture of conc. `HCl` and anhydrous `ZnCl_(2)`. Reason : Lucas reagent can distinguish methanol from ethanol.A. If both assertion and reason are correct and reason is correct explanation for assertion.B. If both assertion and reason are correct but reason is not correct explanation for assertion.C. If assertion is correct but reason is incorrect.D. If assertion and reason both are incorrect. |
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Answer» Correct Answer - C Correct Reason : Both methanol and primary alcohols and cannot be distinguished by Lucas reagent. |
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| 192. |
Which of the following has maximum `p_(Ka)` value ?A. B. C. D. |
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Answer» Correct Answer - D It is the weakest acid (maximum `pKa` value) since it is a tertiary alcohol. |
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| 193. |
The correct acidic strength order of the following is : A. `I gt II gt III`B. `III gt I gt II`C. `II gt III gt I`D. `I gt III gt II` |
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Answer» Correct Answer - B `- NO_(2)` group is electron withdrawing group and increases the acidic strength of phenol while `-CH_(3)` group is electron releasing group and decreases its acidic strength. |
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| 194. |
The most reactive nucleophile among the following isA. `CH_(3)O^(-)`B. `C_(6)H_(5)O^(-)`C. `(CH_(3))_(2)CHO^(-)`D. `(CH_(3))_(3)CO^(-)` |
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Answer» Correct Answer - A `CH_(3)-overset(-)(O)` is the most reactive nucleophile as it is least sterically hindered one. |
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| 195. |
IUPAC name of propargyl alcohol isA. Prop-2-yn-1-olB. Prop-1-yn-2-olC. Prop-2-en-2-olD. Prop-2-en-1-ol |
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Answer» Correct Answer - A `underset(("Propargyl alcohol"))underset("Prop-2-yn-1-ol")(HC -= C-CH_(2)-OH)` |
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| 196. |
A compound is soluble is conc. `H_(2)SO_(4)`. It does not decolourise bromine in `C Cl_(4)` but oxidised by chromic anhydride in aqueous sulphuric acid within two second, turning orange solution to blue green , then opaque. The original solution cotnainsA. A secondary alcoholB. An alkeneC. An etherD. A primary alcohol |
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Answer» Correct Answer - D Since oxidation is easier and occuts very quickly (just 2 seconds), hence it must be primary alcohol. The dichromate solution changes from organe to blue green. |
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| 197. |
The strongest acid among the following aromatic compound isA. Ortho-nitrophenolB. Para-chlorophenolC. Para-nitrophenolD. Meta-nitrophenol |
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Answer» Correct Answer - C Presence of electron withdrawing group `(NO_(2))` present at o or p-positions increases the acidic strength. However the effect is more pronounced when `-NO_(2)` is present at p-position. |
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| 198. |
Which of the following is the most reactive towards attack by an electrophile ? |
| Answer» An electrophile will always prefer to attack centres of high electron density in the ring. Both nitro `(-NO_(2))` and chloro `(-Cl)` groups are electron withdrawing groups. In benzyl alcohol (III), the `OH` group is not directly attached to the ring and is not in a position to activate it. Phenol (I) is the most reactive because phenolic group activates the ring towards electrophilic attack both at the ortho and para positions. | |
| 199. |
A compound containing two `-OH` groups attached with same carbon is unstable, but which one of the following is stable ?A. B. C. D. None |
| Answer» Correct Answer - C | |
| 200. |
`C_(2)H_(5)OH` can be differentiated from `CH_(3)OH` byA. reaction with HClB. reaction with `NH_(3)`C. Iodoform testD. Solubility in water |
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Answer» Correct Answer - C `CH_(3)OH` gdoes not give iodoform test while `C_(2)H_(5)OH` gives it positive. |
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