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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.
| 101. |
Write any teo difference between methyl alcohol and ethyl alcohol. |
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Answer» (i) Upon heating with `I_(2)` and `Na_(2)CO_(3)` solution, ethyl alcohol gives a yellow precipitate of iodoform but methyl alcohol does not. (ii) Methyl alcohol is highly poisonous in nature but ethyl alcohol is not. |
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| 102. |
The reaction of methyl magnesium bromide with ethyl alcohol givesA. methyl alcoholB. methaneC. isopropyl alcoholD. ethane |
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Answer» Correct Answer - B `underset("Ethy alchol")(C_(2)H_(5)OH) + underset("bromide ")underset("Methyl magnesium")(CH_(3)MgBr)rarr underset("Methane")(CH_(4))+C_(2)H_(5)OMgBr` |
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| 103. |
When o-phenolsulphonic acid is heated to 373 K, it givesA. PhenolB. p-Phenolsulphonic acidC. Benzene sulphonic acidD. Benzene |
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Answer» Correct Answer - B o-phenol sulphonic is unstable at higher temperature (373 K) due to steric factor and rearranges to more stable p-isomer. |
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| 104. |
Proof spirit contains aboutA. `40%` alcohol by weightB. `50%` alcohol by weightC. `25%` alcohol by weightD. `10%` alcohol by weight |
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Answer» Correct Answer - B `49.3%` by weight. |
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| 105. |
Which of the following is not formed when glycerol reacts with `HI` ?A. `CH_(2)=CH-CH_(2)I`B. `CH_(2)OH-CHI-CH_(2)OH`C. `CH_(3)-CH=CH_(2)`D. `CH_(3)-CHI-CH_(3)` |
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Answer» Correct Answer - D `CH_(2)-OH-CHI-CH_(2)OH` is not formed in the reaction of glycerol with HI. |
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| 106. |
Mesoxalic acid is obtained when glycerol reacts withA. Dil. `HNO_(3)`B. `Bi(NO_(3))_(2)`C. `H_(2)O_(2)+FeSO_(4)`D. `KMnO_(4)` |
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Answer» Correct Answer - B `{:(COOH),("|"),(C=O),("|"),(COOH):}` Mesoxalic acid |
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| 107. |
Glycerol on oxidation with periodic acid givesA. `2HCHO + HCOOH`B. `2HCOOH + HCHO`C. `3HCOOH`D. `3HCHO` |
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Answer» Correct Answer - A `{:(CH_(2)OH),("|"),(CHOH+2HIO_(4)overset(Delta)rarr2HCHO+HCOOH+2HIO_(3)+H_(2)O),("|"),(CH_(2)OH):}` |
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| 108. |
Dehydration of glycerol givesA. PropaneB. PropeneC. AcroleinD. Benzene |
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Answer» Correct Answer - C Acrolein `(CH_(2)=CH-CHO)` |
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| 109. |
The relative order of acidity of alcohols in comparison to water and ethylene isA. `H_(2)O gt ROH gt HC -= CH`B. `H_(2)O gt HC -= CH gt ROH`C. `ROH gt H_(2)O gt HC -= CH`D. `ROH gt HC -= CH gt H_(2)O` |
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Answer» Correct Answer - A The negative charge on oxygen atom after loss of `H^(+)` ions is more stabilised in water than in an alcohol. `HC-=CH` is least acidic of the three. |
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| 110. |
The best reagents for the ring alkylation of phenol areA. `C_(2)H_(5)Cl` and anhy. `AlCl_(3)`B. `CH_(3)CH=CH_(2)` and `H_(2)SO_(4)`C. `(CH_(3))_(2)CHOH` and `H_(2)SO_(4)`D. `CH_(3)CH=CH_(3)` and HF |
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Answer» Correct Answer - B::C::D `RX` and anhy. `AlCl_(3)` give poor yield beause `AlCl_(3)` coordinates with oxygen of phenol. |
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| 111. |
Final product formed on reduction of glycerol by hydriodic acid isA. PropaneB. Propanoic acidC. PropaneD. None of these |
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Answer» Correct Answer - D Isopropyl iodide |
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| 112. |
`(CH_(3))_(3)C=CHCOOH overset(A)rarr (CH_(3))_(2)C=CHCH_(2)OH` The reagent A in the reaction isA. `H_(2)`/etherB. `B_(2)H_(6)`C. `LiAlH_(4)`/etherD. `H_(2)-Pb//BaSO_(4)` |
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Answer» Correct Answer - C It is a case of reduction of `-COOH` group when double bond is not reduced. This change is brought by `LiAlH_(4)`/ether. |
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| 113. |
Why is cyclohexanol more soluble in water than hexan-1-ol ? |
| Answer» In cyclohexanol, `C_(6)H^(11)` is of cyclic nature. It is more compact than the group `(-C_(6)H_(13))` in hexan-1-ol which is a straight chain alcohol. Due to smaller size, the cyclohexyl group is more exposed to hydrogen bonding with `H_(2)O` molecules in water as compared to the other alkyl group. therefore, cyclohexanol is more soluble in water than hexan-1-ol. | |
| 114. |
How will you distinguish between `CH_(3)(CH_(2))_(3)OH` and `CH_(3)CH=CHCH_(2)OH` by a chemical test ? |
| Answer» Distinction can be made by bromine water. `CH_(3)CH=CHCH_(2)OH` (unsaturated alcohol) decolourises bromine water while `CH_(3)(CH_(2))_(3)OH` does not. | |
| 115. |
Why can not anhydrous calcium chloride be used for drying ethyl alcohol ? |
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Answer» Anhydrous calcium chloride cannot be used for drying ethyl alcohol because it forms an addition compound with the alcohol. `4C_(2)H_(5)OH+CaCl_(2)("anhydrous") rarr CaCl_(2).4C_(2)H_(5)OH` |
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| 116. |
Ethyl alcohol gives ethyl chloride with the help ofA. `SOCl_(2)`B. `NaCl`C. `Cl_(2)`D. `KCl` |
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Answer» Correct Answer - A `NaCl, Cl_(2)` or `KCl` cannot cause replacement of OH group of alcohol. |
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| 117. |
Maximum number of active hydrogens are present inA. Acetic acidB. GlycerolC. MethaneD. Methanol |
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Answer» Correct Answer - B Glycerol |
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| 118. |
p-Phenolsulphonic acid is obtained as the major product when phenol is treated withA. Conc. `H_(2)SO_(4)` at 373 KB. Dil. `H_(2)SO_(4)` at 373 KC. Conc. `H_(2)SO_(4)` at 293 KD. Dil. `H_(2)SO_(4)` at 293 K |
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Answer» Correct Answer - A p isomer is obtained by treating phenol with conc. `H_(2)SO_(4)` at 373 K. |
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| 119. |
What is the product obtained when chlorine reacts with ethyl alcohol in the presence of NaoH?A. `CH_(3)Cl`B. `C_(2)H_(2)Cl`C. `C Cl_(3).CHO`D. `CHCl_(3)` |
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Answer» Correct Answer - D When chlorine reacts with ethyl alcohol in the presence of `NaOH`, chloroform is obtained as a final product. `underset("Ethanol")(CH_(3)CH_(2)OH)+Cl_(2)overset("Oxidation")rarrunderset("Acetaldehyde")(CH_(3)CHO+2HCl)` `CH_(3)CHO+3Cl_(2)overset("Chlorination")rarr underset("Chloral")(C Cl_(3)CHO+3HCl)` `C Cl_(3)CHO+NaOH overset("Hydrolysis")rarr underset("Chloroform")(CHCl_(3))+underset("Sod. formate".)(HCOONa)` |
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| 120. |
Which compound will have highest boiling point ?A. `CH_(4)`B. `CH_(3)OH`C. `C_(2)H_(4)OH`D. `HCHO` |
| Answer» Correct Answer - C | |
| 121. |
The correct sequence of reactions to convert p-nitrophenol into quinol involves............A. reduction, diazotization and hydrolysisB. hydrolysis, diazotization and reductionC. hydrolysis, reduction and diazotizationD. diazotization, reduction and hydrolysis |
| Answer» Correct Answer - A | |
| 122. |
The compound X isA. `C Cl_(4)`B. `CO_(2)`C. `CH_(3)OH`D. `CO` |
| Answer» Correct Answer - B | |
| 123. |
23g of Na will react with ethanol to giveA. One mole of oxygenB. one mole of `H_(2)`C. `(1)/(2)` mole of `H_(2)`D. None of these |
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Answer» Correct Answer - C `Na+C_(2)H_(5)OH rarr C_(2)H_(5)ONa+1//2 H_(2)` 23g of Na gives `H_(2) = 0.5 mol`. |
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| 124. |
Which of the following is phloroglucinol ?A. B. C. D. |
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Answer» Correct Answer - C It is factual question. |
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| 125. |
Order of estrification of alcohols is :A. `T gt S gt P`B. `S gt T gt P`C. `P gt S gt T`D. None of these |
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Answer» Correct Answer - C In esterification of alcohols cleavage of `O-H` bond in alcohols takes place. The order of cleavage of this bond in alcohols is `1^(@) gt 2^(@) gt 3^(@)`. |
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| 126. |
An alcohol on oxidation is found to give `CH_(3)COOH` and `CH_(3)CH_(2)COOH`. The structure of the alcohol isA. `CH_(3)CH_(2)CH_(2)CH_(2)CH_(2)OH`B. `(CH_(3))_(2)C(OH)CH_(2)CH_(3)`C. `CH_(3)CH_(2)CH_(2)CH(OH)CH_(3)`D. `CH_(3)CH(OH)CH_(2)CH_(2)CH_(3)` |
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Answer» Correct Answer - C Since the alcohol forms a mixture of acids, each with lesser number of carbon atoms. This suggests the presence of secondary alcoholic group. `underset(A 2^(@) alcohol")(CH_(3)-CH_(2)-CH_(2)-overset(OH)overset(|)(CH)-CH_(3) overset([O])rarr)` `CH_(3)-CH_(2)-CH_(2)-overset(O)overset(||)(C)-CH_(3) overset([O])rarr CH_(3)CH_(2)COOH+CH_(3)COOH` |
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| 127. |
HBr reacts fastest withA. Propan-1-olB. Propan-2-olC. 2-Methylpropan-1-olD. 2-Methylpropan-2-ol |
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Answer» Correct Answer - D The order of reactivity of alcohols towards HBr is `3^(@) gt 2^(@) gt 1^(@)`. 2-Methylpropan-2-ol is a `3^(@)` alcohol. |
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| 128. |
Which of the following is not true in case of reaction with heated copper at `300^(@)C` ?A. Phenol `rarr` Benzyl alcoholB. Primary alcohol `rarr` AldehydeC. Secondary alcohol `rarr` KetoneD. Tertiary alcohol `rarr` Olefin |
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Answer» Correct Answer - A Phenol when heated with copper at `300^(@)C` do not give benzyl alcohol. |
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| 129. |
The reaction of `(CH_(3))_(2)C(OH)CH_(2)CH_(3)` with copper at `300^(@)C` givesA. `CH_(3)CO(CH_(3))_(2)` and `H_(2)`B. `CH_(3)-underset(CH_(3))underset(|)(C)=CH-CH_(3)` and `H_(2)O`C. `(CH_(3))_(2)C = CHCH_(3)` and `H_(2)O`D. `CH_(3)CH = CHCH_(2)CH_(3)` and `H_(2)` |
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Answer» Correct Answer - C The tertiary alcohols undergoes dehydration at `300^(@)C` to form an alkene with maximum number of `-R` groups and water. `CH_(3)-underset(CH_(3))underset(|)overset(OH)overset(|)(C)-CH_(2)CH_(3) underset(300^(@)C)overset(Cu)rarr CH_(3)-underset(CH_(3))underset(|)(C)=CHCH_(3)+H_(2)O` |
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| 130. |
Which of the following is not a characteristic of alcohol?A. They are lighter than waterB. Their boiling point rise fairly uniformly with rising molecular weightC. Lower members are insoluble in water and organic solvents but the solubility regularly increases with molecular massD. Lower members have a pleasant smell and burning taste, higher members are colourless and tasteless. |
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Answer» Correct Answer - C These question are based upon facts or formulae |
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| 131. |
Rectified spirit is a mixture ofA. 95% ethyl alcohol +5% waterB. 94% ethyl alcohol + 4.53% waterC. 94.4% ethyl alcohol +54.3 % waterD. 95.87% ethyl alcohol +4.13% water. |
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Answer» Correct Answer - D These question are based upon facts or formulae |
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| 132. |
The most suitable method of separation of a mixture of ortho and para nitrophenol in the ratio `1:1` is :A. Steam distillationB. CrystallisationC. VaporisationD. Colour spectrum ? |
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Answer» Correct Answer - A o-Nitrophenol is steam volatile while p-nitrophenol is not. |
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| 133. |
Phenols and alcohols have both the same functional group `(-OH)` but phenols are stronger acids than alcohols. This is mainly due to the reason that the phenoxide ion `(C_(6)H_(5)O^(Ɵ))` left after the release of `H^(+)` ion in phenol is resonance stabilised while the alkoxide ion `(RO^(Ɵ))` in alcohols does not show similar characteristics. The electron withdrawing groups tend to increase the acidic strengths of phenols while electron releasing groups tend to decrease it. the effect of both types of groups is more pronounced when present at the para position than when these are present at the ortho position in the ring. However, their effect at the meta position is relatively very small. The stronger acid among the following isA. o-methoxyphenolB. p-methoxyphenolC. m-methoxyphenolD. phenol. |
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Answer» Correct Answer - B Methoxy group `(-OCH_(3))` at the para position has minimum acid weakening effect. |
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| 134. |
Phenols and alcohols have both the same functional group `(-OH)` but phenols are stronger acids than alcohols. This is mainly due to the reason that the phenoxide ion `(C_(6)H_(5)O^(Ɵ))` left after the release of `H^(+)` ion in phenol is resonance stabilised while the alkoxide ion `(RO^(Ɵ))` in alcohols does not show similar characteristics. The electron withdrawing groups tend to increase the acidic strengths of phenols while electron releasing groups tend to decrease it. the effect of both types of groups is more pronounced when present at the para position than when these are present at the ortho position in the ring. However, their effect at the meta position is relatively very small. Which of the following is the strongest acid ?A. `FCH_(2)CH_(2)CH_(2)CH_(2)OH`B. `FCH_(2)CH_(2)CH_(2)OH`C. `CH_(3)CH_(2)CHFCH_(2)OH`D. `CH_(3)CH_(2)CF_(2)CH_(2)OH` |
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Answer» Correct Answer - D It is the strongest acid due to the presence of two electron withdrawing F atom at `C_(2)` atom. |
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| 135. |
Phenols and alcohols have both the same functional group `(-OH)` but phenols are stronger acids than alcohols. This is mainly due to the reason that the phenoxide ion `(C_(6)H_(5)O^(Ɵ))` left after the release of `H^(+)` ion in phenol is resonance stabilised while the alkoxide ion `(RO^(Ɵ))` in alcohols does not show similar characteristics. The electron withdrawing groups tend to increase the acidic strengths of phenols while electron releasing groups tend to decrease it. the effect of both types of groups is more pronounced when present at the para position than when these are present at the ortho position in the ring. However, their effect at the meta position is relatively very small. The acidic strength increases in the orderA. p-Nitrophenol `lt` m-Nitrophenol `lt` o-NitophenolB. p-Nitrophenol `lt` o-Nitrophenol `lt` m-NitrophenolC. m-Nitrophenol `lt` o-Nitrophenol `lt` p-NitrophenolD. o-Nitropheno `lt` m-Nitrophenol `lt` p-Nitrophenol. |
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Answer» Correct Answer - C It Is the correct increasing order of acidic strength. |
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| 136. |
Phenols and alcohols have both the same functional group `(-OH)` but phenols are stronger acids than alcohols. This is mainly due to the reason that the phenoxide ion `(C_(6)H_(5)O^(Ɵ))` left after the release of `H^(+)` ion in phenol is resonance stabilised while the alkoxide ion `(RO^(Ɵ))` in alcohols does not show similar characteristics. The electron withdrawing groups tend to increase the acidic strengths of phenols while electron releasing groups tend to decrease it. the effect of both types of groups is more pronounced when present at the para position than when these are present at the ortho position in the ring. However, their effect at the meta position is relatively very small. The increasing order of reactivity of `1^(@), 2^(@)` and `3^(@)` alcohols towards sodium metal isA. `1^(@) lt 2^(@) lt 3^(@)`B. `1^(@) lt 3^(@) lt 2^(@)`C. `3^(@) lt 2^(@) lt 1^(@)`D. `2^(@) lt 1^(@) lt 3^(@)` |
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Answer» Correct Answer - C It involves the cleavage of `O-H` bond which is easiest in `1^(@)` alcohols and most difficult in `3^(@)` alcohols. |
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| 137. |
Which of the following alcohol will give a black precipitate of manganese dioxide with alkaline `KMnO_(4)` ?A. `CH_(3)CH_(2)OH`B. `CH_(3)-underset(CH_(3))underset(|)(CH)-underset(CH_(3))underset(|)overset(OH)overset(|)(C)-CH_(3)`C. `(CH_(3))_(3)C-OH`D. All of the above |
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Answer» Correct Answer - A Out of the given three choices (A, B and C) B and C are `3^(@)` alcohols ans as such not oxidised with mild oxidising agents like alkaline `KMnO_(4)`. In the reaction `KMnO_(4)` is itself reduced to `MnO_(2)` (black ppt.) |
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| 138. |
The oxidation of an alcohol `(C_(5)H_(12)O)` with acid dichromate gives a mixture of dimethyl ketone and acetic acid. The alcohol isA. 2-dimethyl-3-butanolB. 2-methyl-1-butanolC. 2-methyl-2-butanolD. 3-methyl-2-butanol |
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Answer» Correct Answer - C This alcohol `C_(5)H_(12)O` gives a ketone with lesser number of carbon atoms. This has to be `3^(@)` alcohol. This is possible in the following structure only : `underset("2-Methyl-2-butanol")(CH_(3)-underset(CH_(3))underset(|)overset(OH)overset(|)(C)-CH_(2)CH_(3))` |
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| 139. |
The compound which gives the most stable carbonium ion on dehydration is :A. `(CH_(3))_(2)CHCH_(2)OH`B. `(CH_(3))_(3)COH`C. `CH_(3)CH_(2)CH_(2)CH_(2)OH`D. `CH_(3)CHOHCH_(2)CH_(3)` |
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Answer» Correct Answer - B The stability of carbonium ions (carbocations) is in the order `3^(@) gt 2^(@) 1^(@)`. As such a `3^(@)` alcohol will give the most stable carbocation. |
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| 140. |
Which of the following compounds is oxidised to prepare ethyl methyl ketone ?A. 2-ButanolB. 2-PropanolC. 1-PropanolD. 2-Pentanol |
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Answer» Correct Answer - A `underset("2-Butanol")(CH_(3)-CH_(2)-underset(OH)underset(|)(CH)-CH_(3))overset([O])rarrunderset("Ethyl methyl ketone")(CH_(3)-CH_(2)-underset(O)underset(||)(C)-CH_(3))` |
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| 141. |
Which of the following is the most stable intermdiate formed during the acid catalysed dehydration of neopentyl alcoholA. `(CH_(3))_(3)Coverset(o+)(C)H_(2)`B. `CH_(3)overset(o+)(C)HCH_(2)CH_(3)`C. `(CH_(3))_(2)overset(o+)(C)CH_(2)CH_(3)`D. all the three are equally stable. |
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Answer» Correct Answer - C The neopentyl alcohol gives more stable `3^(@)` carbocation as an intermediate via rearrangement involving methyl shift. `(CH_(3))_(3)C CH_(2)OH underset(-H_(2)O)overset(H^(+))rarr (CH_(3))_(3)C CH^(o+) overset("Methyl shift")rarr underset(3^(@)-"carbocation")((CH_(3))_(3)overset(o+)(C)CH_(2)CH_(3))` |
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| 142. |
When passed over heated copper at 575 K an organic compound was found to give an ketone. The organic compound is most likely to be a/anA. PrimaryB. Tertiary alcoholC. Secondary alcoholD. Alkane |
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Answer» Correct Answer - C Secondary alcohols undergo dehydrogenation to form ketones when heated with reduced copper. |
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| 143. |
The compound which gives the most stable carbocation isA. `CH_(3)CH_(2)OH`B. `CH_(3)-underset(OH)underset(|)(CH)-CH_(3)`C. `CH_(3)-underset(CH_(3))underset(|)(CH)CH_(2)OH`D. `CH_(3)-underset(OH)underset(|)overset(CH_(3))overset(|)(C)-CH_(3)` |
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Answer» Correct Answer - D The order of stability of carbocations is `3^(@) gt 2^(@) gt 1^(@)`. |
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| 144. |
Which one of the following compounds would not be easilty oxidised by `K_(2)Cr_(2)O_(7)` in dil. `H_(2)SO_(4)` ?A. `CH_(3)OH`B. `(CH_(3))_(3)C-OH`C. `CH_(3)CH_(2)OH`D. `CH_(3)CHO` |
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Answer» Correct Answer - B Tertiary alcohol do not undergo oxidation under mild conditions. |
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| 145. |
Which of the following alcohols can be most easily dehydrated?A. `C_(2)H_(5)OH`B. `(CH_(3))_(2)CHOH`C. `(CH_(3))_(3)COH`D. `CH_(3)CH_(2)CH_(2)OH` |
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Answer» Correct Answer - C Ease of dehydration is `3^(@) gt 2^(@) gt 1^(@)`. |
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| 146. |
Which of the following statements is correct ?A. Phenol is less acidic than ethyl alcoholB. Phenol is more acidic than ethanolC. Phenol is more acidic than carbonic acidD. Phenol is more acidic than `CH_(3)COOH` |
| Answer» Correct Answer - B | |
| 147. |
Glycol is used in the manufacture ofA. TeryleneB. GlyptalC. AntifreezeD. All |
| Answer» Correct Answer - D | |
| 148. |
Electrophilic substitution in phenol generally occurs atA. o-and p-positionsB. metapositionsC. only at ortho positionsD. only at para position |
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Answer» Correct Answer - A Resonance causes development of partial negative charge on ortho and para positions in phenol molecule. |
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| 149. |
Which of the following reactions is an example of Bouveault Blanc reduction ?A. `CH_(3)CN underset(C_(2)H_(5)OH)overset(Na)rarrCH_(3)CH_(2)NH_(2)`B. `CH_(3)COCH_(3) underset(C_(2)H_(5)OH)overset(Na)rarr (CH_(3))_(2)CHOH`C. `CH_(3)COCH_(3)overset(Ni//H_(2))rarr(CH_(3))_(2)CHOH`D. `CH_(3)COCH_(3)underset("ether")overset(LiAlH_(4))rarr(CH_(3))_(2)CHOH` |
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Answer» Correct Answer - B Reduction of aldehydes, ketones and esters by excess of sodium and alcohol or n-butanol is known as Bouveault Blanc reduction. |
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| 150. |
The correct acidic 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 p-Nitrophenol (III) `gt` Phenol (I) `gt` p-Cresol (II) |
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