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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.
| 1. |
Which of the following statements concerning `3,4`-dibromo-`1`-pentane and `3,5`-dibromo-`2`-pentane are correct? (I) They have same molecular formula `C_(5)H_(8)Br_(2)` (II) They are positional isomers. (III) They have similar chemical properties.A. `I` and `III`B. `I` and `II`C. `II` and `III`D. `I,II` and `III` |
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Answer» Correct Answer - B They are positional isomers, hence same molecular formula `C_(5)H_(8)Br_(2)`. However, they are structure isomers, hence different physical and chemical properties. |
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| 2. |
What is the correct relationship between the following compounds? `CH_(3)-CH_(2)-underset(CH_(3))underset(|)CH-CH_(2)-CH_(3)` `CH_(3)-CH_(2)-CH_(2)-CH_(2)-underset(CH_(3))underset(|)CH_(2)`A. Chain isomersB. Position isomersC. Functional isomersD. Identical |
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Answer» Correct Answer - A Carbon skelton is different in both compounds. |
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| 3. |
Consider the following nucleophiles `F^(-),Cl^(-),Br^(-),I^(-)` The correct decreasing order of nucleophilicity is,A. `F^(-)gtCl^(-)gtBr^(-)gtI^(-)`B. `I^(-)gtBr^(-)gtCl^(-)gtF^(-)`C. `Cl^(-)gtF^(-)gtBr^(-)gtI^(-)`D. `Cl^(-)gtBr^(-)gtI^(-)gtF^(-)` |
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Answer» Correct Answer - B See A-Level Information. |
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| 4. |
An aromatic compound having `C_(7)H_(8)O` as the molecular formula has.................isomers. |
| Answer» Correct Answer - five isomers, i.e., benzyl alcohol, anisole, o-m- and p-cresols | |
| 5. |
Which of the following statements regarding ethanoic acid and methyl methanoate are correct? (I) They are functional group isomers with molecular formula `C_(2)H_(4)O_(2)`. (II) They belong to different homologous series (III) They have different chemical properties.A. `I` and `II`B. `I,II` and `III`C. `II` and `III`D. `I` and `III` |
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Answer» Correct Answer - D Ethanoic acid `(CH_(3)COOH)` and methyl methanoate `(HCOOCH_(3))` are isomers, belongs to same homologous series but possesses different physical and chemical properties. |
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| 6. |
Which of the following statements are correct? (I) A pair of positional isomers differs in the position of the same functional group. (II) A pair of structural isomers have the same relative molar mass. (III) A pair of functional group isomers belongs to different homologous series.A. `II` and `III`B. `I` and `III`C. `I` and `II`D. `I,II` and `III` |
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Answer» Correct Answer - C Position isomers differ in position of same functional group on parent chain. Isomers have same molecular formula, hence same molar mass and belongs to same homologous series . |
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| 7. |
Select the most stable carbocation from amongst the followingA. B. C. D. |
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Answer» Correct Answer - B Because of the stability order given below `3^(@)` carbocation `gt 2^(@)` carbocation `gt 1^(@)` carbocation, (B) being `3^(@)` carbocation is the most stable one. |
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| 8. |
Amongst `OH^(-), CH_(3)COO^(-)` and `CH_(3)O^(-)` ions, nucleophilicity decreases in the order.................. . |
| Answer» Correct Answer - `CH_(3)O^(-) gt OH^(-) gt CH_(3)COO^(-)` | |
| 9. |
Which of the following pairs are not functional group isomers ?A. II and IIIB. II and IVC. I and IVD. I and II |
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Answer» Correct Answer - A::C (a) and (c) do not represent pair of functional isomers |
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| 10. |
Which of the following pairs are positive isomers ?A. I and IIB. II and IIIC. II and IVD. III and IV |
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Answer» Correct Answer - B II and III represent position isomers. They differ in the position of carbonyl groups. |
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| 11. |
Which of the following pairs are not position isomers ?A. B. C. D. |
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Answer» Correct Answer - A Position isomers have same structure of the carbon chain but differ only in the position of the functional group or the heteroatom. Here, in option (a) position of oxygen atom is the same but the structure of the carbon chain is different. Hence, option (a) correct. |
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| 12. |
Amongst the following the one which can exist in free state as a stable compound isA. `C_(7)H_(9)O`B. `C_(8)H_(12)O`C. `C_(6)H_(11)O`D. `C_(10)H_(17)O_(2)` |
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Answer» Correct Answer - B A stable compound has a whole number value of DBE. For example, DBE of `C_(8)H_(12)O` `= (8(4-2)+12(1-2)+1(2-2))/(2) +1=2+1 = 3` All other formulae have fractional values of DBE, i.e., `C_(7)H_(9)O, C_(6)H_(11)O` and `C_(10)H_(17)O_(2)` are 3.5, 3.5 and 2.5 respectively. |
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| 13. |
Which of the following compound is the strongest base?A. B. C. D. |
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Answer» Correct Answer - A In (b) and (d) are amides, lesss basic than amines (c) and (a). In (a), carbonyl group is in resonance with phenyl ring. Has less electron withdrawing effect on nitrongen than in (c), hence (a) is the strongest base. |
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| 14. |
Which compound would be least soluble in water?A. `CH_(3)-O-CH_(2)-CH_(2)-CH_(3)`B. `CH_(3)-CH_(2)-CH_(2)-CH_(2)-CH_(3)`C. `CH_(3)-CH_(2)-CH_(2)-CH_(2)-OH`D. `CH_(3)-CH_(2)-O-CH_(2)-CH_(2)` |
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Answer» Correct Answer - B Due to lack of hydrogen bonding, alkane is least soluble in water. |
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| 15. |
Identify the correct order of boiling points of the following compounds: `underset(1)(CH_(3)CH_(2)CH_(2)CH_(2)OH)`, `underset(2)(CH_(3)CH_(2)CH_(2)CHO)` `underset(3)(CH_(3)CH_(2)CH_(2)COOH)`A. `1gt2gt3`B. `3gt1gt2`C. `1gt3gt2`D. `3gt2gt1` |
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Answer» Correct Answer - B In carboxylic acids, molecules are more strongly associated followed by alcohols due to `H`-bonding and in aldehydes there dipole interactions- |
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| 16. |
Which one of the following is notan isomer of 3-methylbut-1-yne ?A. Pent-1-yneB. Buta-1, 3-dieneC. Pent-2-yneD. Penta-1, 3-diene |
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Answer» Correct Answer - B Isomers have same molecular formula but different structures. Buta-1, 3-diene, i.e., option (b) has only four carbon atoms but all others have five carbon atoms. Therefore, (b) is not the isomer of the rest of the compounds. |
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| 17. |
The `IUPAC` name of `CH_(3)-underset(OH)underset(|)(CH)-CH=underset(CH_(3))underset(|)(C )-CHO` isA. 4-Hydroxyl-1-methylpentanalB. 4-Hydroxy-2-methylpent-2-en-1-alC. 2-Hydroxy-4-methylpent-3-en-5-alD. 2-Hydroxy-3-methylpent-en-5-al. |
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Answer» Correct Answer - B `underset("4-Hydroxy-2-methylpent-2-en-1-01")underset()(overset(5)CH_(3)-overset(4)underset(OH)underset(|)C-overset(3)CH=overset(2)underset(CH_(3))underset(|)C-overset(1)CHO`) |
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| 18. |
The structure of 4-Methylpent-2-en-1-ol isA. `CH_(3)CH_(2)CH=CH-CH_(2)-OH`B. `(CH_(3))_(2)CH=CHCH_(2)CH_(2)OH`C. `(CH_(3))_(2)CH CH=CH CH_(2)OH`D. `CH_(3)CH(OH)CH-CH=C(CH_(3))_(2)` |
| Answer» Correct Answer - C | |
| 19. |
The structure of 4-Methylpent-2-en-1-ol isA. `CH_(3)-CH_(2)-HC=CH-CH_(2)OH`B. `CH_(3)-overset(CH_(3))overset(|)(CH)-HC=CH-CH_(2)OH`C. `CH_(3)-overset(OH)overset(|)(CH)-CH_(2)-CH=overset(CH_(3))overset(|)C-CH_(3)`D. `CH_(3)-overset(CH_(3))overset(|)C=CH-CH_(2)CH_(2)OH` |
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Answer» Correct Answer - B Factual question. |
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| 20. |
Write the IUPAC names of the following compounds (i) `CH_(3)-CH_(2)-overset(O)overset(||)(C)-CH_(2)-overset(O)overset(||)(C)-CH_(3)` (ii) `CH_(3)-overset(O)overset(||)(C)-CH_(2)-CH_(2)-CH_(2)-CH_(2)-COOH` (iii) `CH_(3)-underset(C_(2)H_(5))underset(|)(CH)-underset(C_(2)H_(5))underset(|)(CH)-CH_(3)` |
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Answer» (i) Hexane-2,4-dione (ii) 5-Oxohexanoic acid (iii) 3,4-Dimethylhexane |
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| 21. |
Draw all the possible isomers of `C_(4)H_(8)O` (containing carbony group) |
| Answer» `CH_(3)-CH_(2)-CH_(2)-CHO CH_(3)-overset(O)overset(||)(C)-CH_(2)-CH_(3) CH_(3)-underset(CH_(3))underset(|)(CH)-CHO` | |
| 22. |
The correct name of `CH_(3)CH_(2)-underset(O)underset(||)(C)-underset(CN)underset(|)(C)H-CHO` isA. 2-cyano-3-oxopentanalB. 2-formyl-3-oxopentanenitrileC. 2-cyano-1,3-pentadieneD. 1,3-dioxo-2-cyanopentane |
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Answer» Correct Answer - B `underset("2-Formyl-3-oxopentanenitrile")(overset(5)(C)H_(3)-overset(4)(C)H_(2)-underset(O)underset(||)overset(3)(C)-underset(._(1)CN)underset(|)overset(2)(C)H-overset(O)overset(||)(C)-H)` |
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| 23. |
`2`-Methylbut-`2`-ene will be represented asA. `CH_(3)-overset(CH_(3))overset(|)CH-CH_(2)CH_(3)`B. `CH_(3)-underset(CH_(3))underset(|)C=CH-CH_(3)`C. `CH_(3)-CH_(2)-underset(CH_(3))underset(|)C=CH_(2)`D. `CH_(3)-underset(CH_(3))underset(|)CH-CH=CH_(2)` |
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Answer» Correct Answer - B `underset("2-Methylbut-2-en")underset()(overset(1)CH_(3)-overset(2)underset(CH_(3))underset(|)C=overset(2)CH-overset(2)CH_(3)` |
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| 24. |
The correct representation of 4-hydroxy-2-methylpent-2-en-1-al isA. `CH_(3)-underset(OH)underset(|)(C)H-CH=underset(CH_(3))underset(|)(C)-CHO`B. `CH_(3)-underset(CH_(3))underset(|)(C)H-CH=underset(OH)underset(|)(C)-CHO`C. `CH_(3)-underset(OH)underset(|)overset(CH_(3))overset(|)(C)-CH=underset(CH_(3))underset(|)(C)-CHO`D. `CH_(3)-underset(OH)underset(|)(C)H-CH_(2)-underset(CH_(3))underset(|)(C)H-CHO` |
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Answer» Correct Answer - A `underset("4-Hydroxy-2-methylpent-2-en-1-al")(overset(5)(C)H_(3)-underset(OH)underset(|)overset(4)(C)H-overset(3)(C)H=underset(CH_(3))underset(|)overset(2)(C)-overset(1)(C)HO)` |
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| 25. |
The enthalpy of hydrogenation of but `-1-` ene is `125.8 kJ mol^(-1)` but that of but `-2-` ene is nearly `120.0 kJ mol^(-1)`. How will justify ? |
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Answer» `gt C = C lt + H - H rarr gt underset(H)underset(|)(C) - underset(H) underset(|)(C) lt, DeltaH = - ve` (hydrogenation) As the enthalpy of hydrogenation of but `-2-` ene is less than of but `-1-`ene, this means that the former has lesser energy and is more stable than the latter. This is explained on the basis of hyper conjugation. In but `-2-`ene, six `alpha-`hydrogen atoms are available for hyper conjugation whereas in but `-1-` ene, there are only two `alpha-`hydrogen atoms present. This means that there is a greater delocalisation of charge in but `-2-` ene than in but `-1-` ene or the former is more stable `underset("But-2-ene")(H - underset(H)underset(|)overset(H)overset(|alpha)(C) - CH = CH - underset(H)underset(|)overset(H) overset(|alpha)(C) - H)" " underset("But-1-ene")(H_(3)C - underset(H)underset(|)overset(H)overset(|alpha)(C) - CH = CH_(2))` |
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| 26. |
Least contributing resonating structure of nitroethene is:A. B. C. D. |
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Answer» Correct Answer - C In (c) two positive charge on adjacent positon. |
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| 27. |
Which is the incorrect statement regarding resonance contributing structures?A. All atoms in a contributing structures must have complete valence shellsB. All contributing structures must have same arrangement of atomsC. All contributing structures must have same number of valence electrons.D. Equivalent resonance structures have same potential energies |
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Answer» Correct Answer - A There may an atom with incompleat valence shell in one or more contributing structure is e.g. `{:(overset(+)(C)H_(2)-CH=underset(I)(CH)-O-CH_(3)harrCH_(2)=CH),(overset(+)underset(II)(CH)-O-CH_(3)harrCH_(2)=CH-underset(III)(CH)=overset(+)(O)-CH):}` Both `I` and `II` have a carbon atom with sexter of electrons while `III` has all its atoms with complete valence shell. |
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| 28. |
The total number of contributing structures showing hyperconjugation (involving `C-H` bonds) for the following carbocation is A. 6B. 5C. 4D. 3 |
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Answer» Correct Answer - A There are 6 `alpha`-hydrogen atoms. Thus 6 contributing structures are possible. |
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| 29. |
which of the following is an electrophilic reagent?A. `H_(2)O`B. `NH_(3)`C. `OH^(-)`D. `NO_(2)^(+)` |
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Answer» Correct Answer - D Electron deficiehn species act as electrophiles i.e., `NO_(2)^(+)`. |
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| 30. |
Which of the following is an electrophilic reagent ?A. `RO^(-)`B. `BF_(3)`C. `NH_(3)`D. `ROH`. |
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Answer» Correct Answer - B `BF_(3)` is an electrophilic reagent. |
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| 31. |
Which one of the following is most reactive towards electrophilic reagent ?A. B. C. D. |
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Answer» Correct Answer - D Due to + R effect of -OH group and hyper- conjugation of - `CH_(3)` group |
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| 32. |
Statement-1: Phenol is more acidic than benzoic acid Statement-2: Fluorbenzene is les reactive than chlorobenzene towards electrophilic substitiution Statement-3: Friedel Craft alkylation is not possible in tertiary butyl benzeneA. TFTB. F F FC. F T FD. T T F |
| Answer» Correct Answer - B | |
| 33. |
The petrol of octane number 80 has :A. 80% n-heptane + 20% iso-octaneB. 20% n-heptane + 80% iso-octaneC. 20% n-heptane + 80% n-octaneD. 80% n-heptane + 20% n-octane |
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Answer» Correct Answer - B (B) Octane number is the percentage of iso-octane (2, 2, 4-trimethylpentane) in a mixture of iso- octane and n-heptane which has the same anti- knock properties as the given fuel. Thus a mixture having 80% iso-octane and 20% n-heptane has a octane number of 80. |
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| 34. |
Can kerosine be used as a substitute for petrol in autominiles ? Give reasons in supoport of your answer. |
| Answer» No kerosene cannot be used as a subtitute for petrol as an automoblie fur .Pasoline has lower iginition temperature and the hydrocarbons have corbon chain length raging from `C_5 - C_10` Kerosene has higher igition tempreratue kerosene has not be ignited by spark plug .Because of longer carbon chain it produce very high knocking which makes irt unsuitable for as an automobile fuel | |
| 35. |
Fluorination of methane is explosive. How do you account for this? How can fluorination of methane be carried out? |
| Answer» Attack of fluorine on methane is highly exothermic reaction with very less activation energy . The high amounts of energy released in this step make the fluorine molecules to dissociate in greater number leading to a greater increase in the rate of reaction , which ultimately makes the reaction explosive .Hence the maxture of `C_H` and `F_2` when diluted with inert gas like He or Ne or `N_2` , the rate of the reaction can be decreased . And also when the reaction is carried in a copper vessel copper being good conductor of heat, absorbs excess heat and thus makes the reaction to be moderate. | |
| 36. |
Why do detergents cause pollution? How do newly developed biodegradable detergents differ from them? |
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Answer» (i) structure of non-polar hydrocarbon part of detergent molecule (ii) effect of structure on degration (iii) structure of biodegradable detergents (iv) comparison of structures of biodegradable and non-bio-degradable detergents |
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| 37. |
The IUPAC name for `CH_(3) - underset(OH)underset(|)(CH) - CH_(2) - underset(OH)underset(|)overset(CH_(3))overset(|)(C) - CH_(3)` is:A. 1, 1-Dimethylbutane -1, 3-diolB. 4-Methylpentane-2, 4-diolC. 2-Methylpentane-2, 4-diolD. 1, 3, 3-Trimethylpropane-1, 3-diol |
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Answer» Correct Answer - C `{:(" "CH_(3)),(" |"),(overset(5)(C)H_(3)-overset(4)(C)H-overset(3)(C)H_(2)-overset(2)(C-)overset(1)(C)H_(3)),(" |"" |"),(" "OH" "OH):}` 2-Methypantane-2, 4-diol |
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| 38. |
In which of the following molecules, all atoms are coplanar ?A. B. C. D. |
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Answer» Correct Answer - A Biphenyl, i.e., option (a) is correct since all the carbon are `sp^(2)`-hybridized. |
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| 39. |
The IUPAC name of `CH_(3)-overset(OH)overset(|)underset(CH_(3))underset(|)C-CH_(2)-underset(CH_(3))underset(|)CH-CH_(3)`A. 2,4-Dimethylpentan-2-01B. 2,4-Dimethylpentan-4-01C. 2,2-Dimethylbutan-2-01D. Butanol-2, |
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Answer» Correct Answer - A `underset("2,4-Dimethylpentan-2-01")underset()(overset(1)CH_(3)-overset(OH)overset(|2)underset(CH_(3))underset(|)C-overset(3)CH_(2)-overset(4)underset(CH_(3))underset(|)(CH)-overset(5)CH_(3))` |
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| 40. |
0.2 g off an organic compound contains C, H and O. On combustion, it yields 0.15 g `CO_(2) and 0.12" g "H_(2)O`. The percentage of C, H and O respectively isA. `C=15%,H=20%,O=65%`B. `C=10%,H=8.2%,O=81.8%`C. `C=12.2%,H=8.8%,O=79%`D. `C=20%,H=6.66%,O=73.34%` |
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Answer» Correct Answer - D % of `C=(12)/(44)xx(0.15)/(0.2)xx100=20%` % of `H=(2)/(18)xx(0.12)/(0.2)xx100=6.66%` % of `O=100-(20+6.66)=73.34%` |
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| 41. |
The elution sequence of a mixture of compounds containing chlorobenzene, anthracene and p-cresol developed on an alumina column using a solvent system of progressively increasing polarity isA. anthracene `rarr`chlorobenzene `rarr` p-cresolB. anthracene `rarr` p-cresol `rarr` chlorobenzeneC. chlorobenzene `rarr` anthracene `rarr` p-cresolD. p-cresol `rarr` anthracene `rarr` chlorobenzene |
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Answer» Correct Answer - A Sequence of elution upon the polarity of the compound to be eluted , higher the polarity, later is the sequence of elution. Anthracene being least polar is eluted first, followed by chloro-benzene having little higher polarity while p-cresol being most polar is eluted last of all. Thus, option (a) is correct. |
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| 42. |
The `IUPAC` name of `CH_(3)-overset(CH_(3))overset(|)(CH)-overset(O)overset(||)(C )-CH_(2)CH_(2)OH` isA. 1-Hydroxy-4-methylpentan-3-oneB. 2-Methyl-5-hydroxypentan-3-oneC. 4-Methyl-3-oxopentan-1-01D. Hexan-1-01-3-one |
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Answer» Correct Answer - A `underset("4-Methyul-3-oxopentan-1-01")underset()(overset(5)CH_(3)-overset(CH_(3))overset(|4)(CH)-overset(O)overset("||3")C-overset(2)CH_(2)-overset(1)CH_(2)OH)` |
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| 43. |
0.30 g of an organic compound containing C, H and O on combustion yields 0.44 g `CO_(2)` and 0.18 g `H_(2)O`. If one mole of compound weighs 60, then molecular formula of the compound isA. `C_(3)H_(8)O`B. `C_(2)H_(4)O_(2)`C. `CH_(2)O`D. `C_(4)H_(6)O` |
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Answer» Correct Answer - B `%C = (12)/(44) xx (0.44)/(0.30) xx 100 = 40` `%H = (2)/(18) xx (0.8)/(0.30) xx 100 = 6.66` `%O = 100 - (40.0 + 6.66) = 53.34` Now `C:H:O = (40)/(12) : (6.66)/(1.0) : (53.34)/(16)` = 3.33: 6.66 : 3.33 `:. E.F. = CH_(2)O` E.F. wt. = 12+2+16 = 30 But Mol. wt. = 60 `:. M.F. = CH_(2)O xx (60)/(30) = C_(2)H_(4)O_(2)` |
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| 44. |
Which of the following molecules represents the order of hybridization `sp^(2), sp^(2), sp, sp` from left to right atoms ?A. `HC -= C-C-=CH`B. `CH_(2)=CH-C-=CH`C. `CH_(2)=CH-CH=CH_(2)`D. `CH_(3)-CH=CH-CH_(3)` |
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Answer» Correct Answer - B `overset(sp^(2))(CH_(2))=overset(sp^(2))(CH)-overset(sp)(C)-=overset(sp)(CH)` |
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| 45. |
Which of the following is the correct orderr of acidity of carboxylic acids? (i) `Cl_(3) C C OOH gt Cl_(2)CHCOOH gt ClCH_(2)COOH` (ii) `CH_(3)CH_(2)COOH gt (CH_(3))_(2)CHCOOH gt (CH_(3))_(3)C COOH` (iii) `F_(2)CHCOOH gt FCH_(2)COOH gt ClCH_(2)COOH`A. (i) and (ii)B. (ii) and (iii)C. (i) and (iii)D. (i), (ii) and (iii) |
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Answer» Correct Answer - D The strength of the acid increases with the inductive effect of the electronegative group attached to it (-I effect). The strength of the acid decreases with the presence of electron releasing group. |
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| 46. |
The systematic name of `(CH_(3))_(2) CHCOOH` is:A. 2-Propanoic acidB. IsobutanoicC. 2-Methylpropanoic acidD. 2-Methylbutanoic acid |
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Answer» Correct Answer - C `{:(overset(3)(C)H_(3)-overset(2)(C)H-overset(1)(C)OOH),(" |"),(" "CH_(3)):}` 2-Methylpropanoic acid |
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| 47. |
Which of the following represents the given mode of hybridization `sp^(2)-sp^(2)-sp-sp` from left to right ?A. `H_(2)C=CH-C-=N`B. `HC -= C-C-=CH`C. `H_(2)C=C=CH_(2)`D. |
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Answer» Correct Answer - A `H_(2)overset(sp^(2))(C)=overset(sp^(2))(C)-overset(sp)(C)-=overset(sp)(N)` |
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| 48. |
Which of the following represents the systematic name of the compound `CH_(2)=CH-CH_(2)Cl` ?A. Allyl chlorideB. 1-Chloroprop-3-eneC. 3-Chloroprop-1-eneD. Vinyl chloride |
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Answer» Correct Answer - C `underset("3-Chloroprop-1-en")underset()(overset(1)CH_(2)=overset(2)CH-overset(3)CH_(2)Cl)` |
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| 49. |
The systematic name of `HCON(CH_(3))_(2)`A. N, N-DimethylformamideB. N,N-DimethylaminomethanolC. 2,3-DimethylbuteneD. 1,2-Dimethylcyclobutane. |
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Answer» Correct Answer - A Factual questions. |
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| 50. |
Systematic name of urea isA. DiaminoketoneB. 1-AminoethanamideC. 1-AminomethanamideD. Aminoacetamide. |
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Answer» Correct Answer - C `underset("Urea (1-Aminomethanamide)")underset()(H-overset(H)overset(|)N-overset(O)overset("||")C-overset(H)overset(|)N-H)` |
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