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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. |
The structure of 4-Methylpent-2-en-1-ol isA. `CH_(3)CH_(2)CH=CHCH_(2)OH`B. `(CH_(3))_(2)C=CHCH_(2)CH_(2)OH`C. `(CH_(3))_(2)CHCH=CHCH_(2)OH`D. `CH_(3)CH(OH)CH-CH=C(CH_(3))_(2)` |
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Answer» Correct Answer - C `{:("5 4 3 2 1"),(CH_(3)-CH-CH-CH-CH_(2)-OH),(" |"),(" "CH_(3)),(" 4-Methylpent-2-en-1-ol"):}` |
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| 2. |
The `IUPAC` name of `CH_(3)OC_(2)H_(5)` isA. (1) methyl ethyl etherB. (2) ethyl methyl etherC. (3) methoxyethaneD. (4) ethoxyethane |
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Answer» Correct Answer - C The compound is an unsymmetrical ether, named as alkoxyalkane. The bigger group `(C_(2)H_(5))` is a part of alkane: `underset("Methyoxyethane")(CH_(3)O-CH_(2)CH_(3))` |
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| 3. |
The condensed forlmula for isoprophyl alcohol can be written in…………different ways.A. (1) just oneB. (2) fourC. (3) twoD. (4) three |
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Answer» Correct Answer - B (i) `H-underset(H)underset(|)overset(H)overset(|)(C )-underset(Dash fo r m u la)underset(H)underset(|) underset(O)underset(|)overset(H)overset(|)(C)-underset(H)underset(|)overset(H)overset(|)(C )-H rarr CH_(3)underset(OH)underset(|)(CH)CH_(3)` , (ii) `CH_(3)CH(OH)CH_(3)` (iii) `CH_(3)CHOHCH_(3)` , (iv) `(CH_(3))_(2)CHOH` |
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| 4. |
The correct nomenclature `(IUPAC)` for the following alcohol is A. (1) `2`-ethylbutan-`2`-olB. (2) `3`-methylpentan-`3`-olC. (3)`3`-ethyl-`3`methylpentan-`3`-olD. (4) `1,1`-diethylanol |
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Answer» Correct Answer - B The compound is an alcohol. Thus, its `IUPAC` name is alkanol. Select the longest possible continuous `C` chain carrying the -OH group: `overset(1)(CH_(2))overset(2)(CH_(3))-underset("3-Methylpentane-2-ol")(underset(OH)underset(|)overset(CH_(3))overset(3|)(C)-overset(4)(CH_(3))overset(5)(CH_(2)))` |
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| 5. |
The IUPAC name of `CH_(3)C-=C CH(CH_(3))_(2)` isA. 4-Methylpent-2-yneB. 4,4-Dimethylbut-2-yneC. Methyl isopropyl acetyleneD. 2-Methylpent-4-yne |
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Answer» Correct Answer - A `{:("1 2 3 4 5"),(CH_(3)-C-=C-CH-CH_(3)),(" |"),(" "CH_(3)),(" 4-Methylpent-2-yne"):}` |
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| 6. |
The `IUPAC` name of `CH_(3)-overset(OH)underset(CH_(3))underset(|)overset(|)(C)-CH_(2)-underset(CH_(3))underset(|)(CH)-CH_(3)` isA. (1) Butanol-`2`B. (2) `2,2`-dimethylbutan-`2`olC. (3) `2,4`-dimethylpentan-`4`-olD. (4) `2,4`-dimethylpentan-`2`-ol |
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Answer» Correct Answer - D The compound is a monohydric alcohol, named as alkanol. The `C` atom carrying the `-OH` should get the lowest possible number : `overset(1)(CH_(3))-underset(2,4-"Dimethylpentan-2-ol")(underset(CH_(3))underset(|)overset(OH)overset(2|)(C)-overset(3)(CH_(2))-underset(CH_(3))underset(|)overset(4)(CH)-overset(5)(CH_(3))` |
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| 7. |
The `IUPAC` name of the compound `CH_(3)underset(OH)underset(|)(CH)=CHCH_(2)COOH` isA. (1) hydroxypentenoic acidB. (2) `4`-hydroxypent-`3`-enoic acidC. (3) `4`-hydroxypent-`4`-enoic acidD. (4) `4`-hydroxy-`4`-methyl-`3`-enepentenoic acid |
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Answer» Correct Answer - B The compound is an unsaturated carboxylic acid (alkenoic acid). The `C` of the `-CO_(2)H` group is always numbered `1`. `overset(5)(CH_(3))underset("4-Hydroxypent-3-enoic acid")(underset(OH)underset(|)overset(4)(CH)=overset(3)CHoverset(2)CH_(2)overset(1)COOH` |
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| 8. |
The `IUPAC` name of the compound `CH_(3)underset(OH)underset(|)(CH)CH_(2)-underset(OH)underset(|)overset(CH_(3))overset(|4)(C)-CH_(3)` isA. 1,1-Dimethylbutane-1,3-diolB. 4-Methylpentane-2,4-diolC. 2-Methylpentane-2,4-diolD. 1,3,-Trimethylpropane-1,3-diol |
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Answer» Correct Answer - C `{:(" "CH_(3)),("5 4 3 2| 1"),(CH_(3)-CH-CH_(2)-C-CH_(3)),(" | |"),(" OH OH"),(" 2-Methylpentane-2,4-diol"):}` |
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| 9. |
The `IUPAC` name of `CH_(3)-overset(O)overset(||)(C)-CH_(2)-overset(OH)overset(|)(CH)-CHO` isA. (1) `5`-oxo-`4`-hydroxypentan-`2`-oneB. (2) `4`-hydroxy-`5`-alpentan-`2`-oneC. (3) `2`-hydroxy-`4`-oxopentanalD. (4) `1`-al-`4`-oxopentan-`2`-ol |
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Answer» Correct Answer - C It is a polyfunctional compound. The principal function is `-CHO`, thus, the compound is named as alkanal: `overset(5)(CH_(3))-underset("2-Hydroxy-4-oxopentanal")(overset(O)overset(||4)C-overset(3)CH_(2)-overset(OH)overset(2|)(CH)-overset(1)CHO`) |
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| 10. |
The `IUPAC` name of the following compound `Cl_(3)C-CH_(2)CHO` isA. (1) `3,3,3`-trichloropropanalB. (2) `1,1,1`-trichloropropanalC. (3) `2,2,2`-trichloropropanalD. (4) chloral |
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Answer» Correct Answer - A The compound is an aldehyde ( alkanal), the `C` atom of the `-CHO` group is numbered `1`: `underset("3,3,3-Trichloropanal")(Cl_(3)overset(3)C-overset(2)(C)H_(2)-overset(1)CHO` |
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| 11. |
The IUPAC name of following compound `{:(" "H" "C_(4)H_(9)),(" | |"),(CH_(3)CH_(2)-C-C-CH_(3)),(" | |"),(" "CH_(3)CH_(3)):}` isA. 3,4,4-TrimethylheptaneB. 3,4,4-TrimethyloctaneC. 2-Butyl2-methyl-3-ethylbutaneD. 2-Ethyl-3,3-dimethylheptane |
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Answer» Correct Answer - B `{:(" 5 6 7 8"),(" H CH"_(2)-CH_(2)-CH_(2)-CH_(3)),("1 2 3| 4|"),(CH_(3)-CH_(2)-C-C-CH_(3)),(" | |"),(" "CH_(3) CH_(3)),(" 3,4,4-Trimethyloctane"):}` |
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| 12. |
The degree of unsaturation in i. `C_(3)H_(3)Cl_(3), ii. C_(3)H_(4)O, iii. C_(4)H_(5)N` is : |
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Answer» (D.U.)(i) `(1)/(2)[2xx3+(2-6)]` `=1^(@)` (ii) `(1)/(2)[2xx3+(2-4)]` `=2^(@)` (iii) `(1)/(2)[2xx4+(2-4)]` `=3^(@)`. |
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| 13. |
The `IUPAC` naem of the compound isA. (1) `4`-dimethylbenzoyl chlorideB. (2) `4,4`-dimethylbenzene carbonyl chlorideC. (3) `4,4`-dimethylbenzoyl chlorideD. (4) `4`-dimathylbenzene carbonyl |
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Answer» Correct Answer - B Suffix carbonyl chloride is used when the function `-overset(O)overset(||)(C)-Cl` is bonded to a ring system. |
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| 14. |
What is the IUPAC name of `H-overset(overset(O)("||"))(C)-CH_(2)-CH_(2)-OCH_(3)`A. 2-FormylmethoxyethaneB. MethoxypropanalC. 2-MethoxypropanalD. 3-Methoxypropanal |
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Answer» Correct Answer - D `{:(" O"),(" ||1 2 3"),(H-C-CH_(2)-CH_(2)-OCH_(3)),("3-Methoxypropanal"):}` |
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| 15. |
The `IUPAC` name of isA. (1) o-deuteriotolueneB. (2) deuterium methyl phenyleneC. (3) `2`-deuterio-`1`-methylbenzeneD. (4) `1`-deuterio-`2`-methylbenzene |
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Answer» Correct Answer - D Use the alphabetical order to decide the number scheme for the substituents. |
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| 16. |
The `IUPAC` name of `CH_(3)CH_(2)CH_(2)CH(CH_(3))COCH_(3)` isA. (1) isohexanoneB. (2) heptanoneC. (3) hexan-`5`-oneD. (4) `3`-methylhexan-`2`-one |
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Answer» Correct Answer - D The compound is a branched ketone having the `IUPAC` name aklanone. `overset(6)(CH_(3))overset(5)(CH_(2))overset(4)(CH)underset("3-methylhexan-2-one")(underset(CH_(3))underset(|)overset(3)(CH)-overset(O)overset(2||)(C)-overset(1)CH_(3))` |
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| 17. |
Which of the following is the correct decreasing order of priority for the functional groups ?A. (1) `-CONH_(2), -CHO, -SO_(3)H, -COOH`B. (2) `-SO_(3)H, -COOH, -CONH_(2), -CHO`C. (3) `-COOH, SO_(3)H, -CONH_(2), -CHO`D. (4) -`CHO, COOH, -SO_(3)H, -CONH_(2)` |
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Answer» Correct Answer - C In polyfunctional compounds, the `-COOH` group always gets the highest priority followed by `-SO_(3)H, -CONH_(2)` and `-CHO:` |
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| 18. |
Write the IUPAC names of the following compounds : |
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Answer» (i) Prop-2-enal (ii) But-1-en-3-yne (iii) 2,3-Dichloro-2-methylbutan-1-ol (iv) 2-Ethoxy-4-methoxypentan-3-one (v) 2-Methylpropan-2-ol (vi) But-2-en-1-amine (vii) Propenitrile (viii) 2,3-Dihydroxy-4-methoxypentanol (ix) 4-Hydroxypentan-2-one (x) 3-Bromo-5-chloro-3,5-dimethylheptane (xi) 2,4-Dimethylpentan-2-one (xii) 2-Methylbutanoic acid (xiii) 3-Methyl-3-(N-methyl)-pentananmine (xiv) 2-Methoxy-2,3-dimethylbutanal (xv) 1-Methoxybutane-2,3-dione (xiv) N-Chloro-N-ethymethanamide (xvii) 3-Carbomylpent-3-enoic acid (xviii) Propane-1,2,3-carbonitrile (xix) 3-(Carboxymethyl) heptane-1,7-dioic acid (xx) 2-Ethoxy-4-methoxypentan-3-one (xxi) But-3-en-1-amine (xxii) Ethylethanote ltb rgt (xxiii) 4-Methylhexanoic acid (xxiv) 3-Bromo-2-methylprop-1-ene. (xxv) Pent-2-enal (xxvi) Hex-4-en-3-ol (xxvii) 3-Chloro-2,2-dimethylbutane (xxviii) 2-Bromo-4-chlorohexane (xxix) 4-Chloropent-1-ene (xxx) 2-Methylpropanal (xxxi) 3-Hydroxybutanoic acid (xxxii) 3-Methylbut-2-en-1-ol (xxxiii) 2-Methylpropan-1,3-diol (xxxiv) 3-Methylpropan-1,3-diol (xxxv) 2Methylprop-2-en-1-ol (xxxvi) N,N-diethylpropanamine (xxxvii) 2,2-Dimethylpropan-1-ol (xxxviii) 2-(N,N-dimethyl)-butane (xxxix) 4-Methylpentan-2-one (xxxx) 2-Bromo-3-methybutan-1-ol (xxxxi) Ethanedioic acid. |
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| 19. |
One entire branch of chemistry is devoted to the behaviour of the compounds of just one element carbon because (i) there are many more compounds that contain carbon than there are compounds that do not. (ii) the molecuels containing carbon can be so simple, so the much larger, and more complex. (iii) organic compounds have been divided into families which generally have no counterparts among the inorganic compounds. (iv) the arrangement of atoms in even relatively small molecules can be very complicated.A. (1) (i), (ii), (iii), (iv)B. (2) (i), (ii)C. (3) (i), (ii), (iii)D. (4) (i), (iii), (iv) |
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Answer» Correct Answer - A (a) More than `19` million natural and synthetic organic compounds have been indentified so far and thousands of new ones are made each week in chemical laboratories throughout the world. This number is significantly gretare than the `10, 000` or so inorganic compounds known to exist. (b) A methane molecule while `DNA` contains tens of billions of atoms per molecule. |
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| 20. |
Which of the following compound has wrong IUPAC name?A. `CH_(3)CH_(2)CH_(2)COOCH_(2)CH_(3)` : EthybutanoateB. `{:(CH_(3)-CHCH_(2)CHO),(" |"),(" "CH_(3)):}` : 3-Methybutan-3-olC. `{:(CH_(3)-CH-CH-CH_(3)),(" | |"),(" OH CH"_(3)):}` : 2-Methybutan-3-olD. `{:(" O"),(" ||"),(CH_(3)-CH-C-CH_(2)CH_(3)),(" |"),(" "CH_(3)):}` :20-Methylpentan-3-one |
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Answer» Correct Answer - C `{:(CH_(3)-CH-CH-CH_(3)),(" | |"),(" OH CH"_(3)),("Correct IUPAC name is 3-Methylbutan-2-ol"):}` |
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| 21. |
What is wrong with the names given for these compounds ? Provide the correct name for each. |
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Answer» (i) The parent chain has six carbon atoms and not five Correct IUPAC name : 3-Methylhex-3-ene (ii) The lowest set of locant rule has not been followed Correct IUPAC name : 2,7,8-Trimethyldecane (iii) Lowest number has not been given to the locant for the secondary suffix. Correct IUPAC name : Pent-4-yn-1-ol (iv) The functional group is a N-methylamine Correct IUPAC name : N-Methylbut-3-enamine (v) Ring has more carbon atoms than the alkyl group Correct IUPAC name : Propylcyclohexane (vi) Lowest sum rule has not been followed Correct IUPAC name : 1,2,4-Trimethylcyclopentane (vi) Lowest number has been given to the lacant for the prefix and not to en. Correct IUPAC name : 3-Chlorocyclopentene. |
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| 22. |
We encounter many organic compounds every day. Which of following is used as a nail polish remover?A. (1) EthanolB. (2) Ethylene glycolC. (3) AcetoneD. (4) Both (2) and (3) |
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Answer» Correct Answer - C Ethanol is grain alcohol, ethylene glycol is an automobile antifreeze. |
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| 23. |
Although millions of organic compounds are known, the elements they contain are very few: `C`(always), `H`(almost), `N, O` a halogen, `S, P` (often), and sometimes another element. The great number and variety of organic compounds are a result of which of the follocwing? (i) Carbon is in group `14` of the periodic table and forms bonds with almost every other element(other than the noble gases). (ii) Carbon atoms have the ability to bond to other carbon atoms in single and multiple bonds, forming long chains, branched chains, and rings (that may also have chains attached to them) of various lengths. (iii) The existanece of different carbon compounds with identical molecular formulas called isomers. (iv) Other kinds of atoms such as nitrogen, oxygen, and sulphur may be attached to the carbon atoms by single and//or multiple bonds.A. (1) (i), (ii), (iii)B. (2) (i), (ii), (iv)C. (3) (i), (ii), (iii), (iv)D. (4) (i), (iii), (iv) |
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Answer» Correct Answer - C The linking of like atoms is called catenation. Several other elements have limited ability catenation to form such chains or rings of like atoms, but only carbon does this with more than a few atoms. For example, petrolium consists of molecules of up to `30` or more carbon atoms bonded together, and chains of thousands to `C` atoms exists in molecules of polyethylene plastic. The tetravalence of `C`(its covalency of four) also makes possible the branching of chains and the fusion of several rings. Due to isomerism, great variety can be found, even among the smaller organic molecules. |
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| 24. |
Which of the following is wrong?A. (1) The word organic was originally used by the `18th` century chemists to describe the compounds of plant or animal origin (living sources) whereas inorganic was used to describe the compounds from minerals.B. (2) The `18th` century chemists believed that nature possessed a certain vital force and that only living things could produce organic compounds.C. (3) This romantic notion was disproved in `1828` by Friedrich Wohler, a German chemist, who synthesized urea (an organic compound) by boiling ammonium cyanide (an inorganic compound) with water.D. (4) We encounter organic chemistry in every aspect of our lives. All life is based on a complex interrelationship of thousances. |
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Answer» Correct Answer - C `F`. Wholer synthesized urea (a constituent of urine) by evaporating an aqueous solution containing ammonium cyanate `(NH_(4)OCN)`, a compound obtained from nonliving materials. He also prepared urea from the reaction between inorganic compounds, lead cyanate, and aqueous ammonia: `Pb(OCN)_(2) + 2NH_(3) + 2H_(2)O rarr 2(NH_(2))_(2)CO + Pb(OH)_(2)` (1) Although we still use the term organic, it no longer distinguishes between compounds of living and nonliving origin. Today we know that there are no fundamental difference between organic and iorganic compounds-the same principles apply to both of them. (2) Today many organic compounds are manufactured from inorganic materials. (4) The compounds of carbon are central to life on this planet. Carbon compounds include `DNA`, the giant helical molecules that contain all our genetic information. They include proteins that catalyze all of the reactions in our body, and that constitute the essential compounds of our blood, muscle, and skin. Together with oxygen, from the air we breath, carbon compounds furnish the energy that sustains life. |
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| 25. |
Urea `(NH_(2)CONH_(2))` was first obtained from urine, where it occurs from the breakdoun ofA. (1) carbohydratesB. (2) protenisC. (3) fatsD. (4) hormones |
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Answer» Correct Answer - B Urea, `H_(2)N-CO-NH_(2)`, is the principal end product of metablism of nitrogen-containing compounds in mammals. It is eliminated in the urine. An adult man excretes about `30 g` of urea in `24 h`. |
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| 26. |
Which of the following compounds is bicyclo `[3.3.0]` oct-ane?A. (1) B. (2) C. (3) D. (4) |
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Answer» Correct Answer - C compound (a) is bivyclo `[4.2.0]` octane, compound (b) is bicyclo `[5.1.0]` octane, and compound (d) is spiro `[5.2]` octane. |
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| 27. |
When the hybridization state of a carbon atom changes from `sp^(3)` to `sp^(2)` and finally to `sp`, the angle between the hybridized orbitalsA. (1) decreases graduallyB. (2) decreases considerablyC. (3) is not affectedD. (4) increases progressively |
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Answer» Correct Answer - D `sp^(3) (109.5^(@)) lt sp^(2) (120^(@)) lt sp (180^(@))` |
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| 28. |
The `IUPAC` name of the compound `CH_(3)-underset(CH_(3))underset(|)(C)-underset(CH_(2))underset(||)(C)-CH_(2)-CH_(3)` isA. (1) `2`-ehtyl-`3`-methylbut-`1`-eneB. (2) `2`-Isopropylbut-`1`-eneC. (3) `2`-methyl-`3`-ethylbut-`3`-eneD. (4) `2`-(1-methylethyl)but-`1`-ene |
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Answer» Correct Answer - A It is a branched alkene. Select the longest possible continuous `C` chain containing the `C=C` bond and carrying the maximum number of side chains: `overset(4)(CH_(3))-underset(2-"Ethyl-3-methylbut-1-ene")(underset(CH_(3))underset(|)overset(3)(CH)-underset(.^(1)CH_(2))underset(||)overset(2)(C)-CH_(2)CH_(3))` |
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| 29. |
The `IUPAC` name of isA. (1) dimethylamino-`4`-methylpentanoneB. (2) `N,N,4`-trimethylpentanamideC. (3) `2`-methyl-`5`-oxodimathylpentanamineD. (4) `N,N`-dimathylamino-`4`-methylpentanamide |
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Answer» Correct Answer - B The compound is an amide derived from pentanoic acid: `overset(5)(CH_(3))-underset(CH_(3))underset(|)overset(4)(CH)-overset(3)(CH_(2))-overset(2)(CH_(2))-overset(O)overset(1||)(C)-underset(CH_(3))underset(|)(N)-CH_(3)` |
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| 30. |
The `IUPAC` name of isA. (1) `N,4`-diethyl-`N,2`-dimethylbutan-`4`-amineB. (2) `3`-(ethylmethylamino)-`5`-methylhexaneC. (3) `N`-ethyl-`N,2`-dimethylhexan-`4`-amineD. (4) `N`-ethyl-`N,5`-dimethylhexan-`3`-amine |
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Answer» Correct Answer - D The compound is a tertiary amine: `Overset(6)(CH_(3))underset(CH_(3))underset(|)overset(5)(CH)overset(4)(CH_(2))underset(CH_(2)CH_(3))underset(|2)overset(3)(CH)-overset(CH_(3))overset(|)(N)-CH_(2)CH_(3)` |
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| 31. |
The `IUPAC` name of isA. (1) `3`-isopropyl-`2`-pentylcyanideB. (2) `3`-isopropyl-`2`-methylpentanenitrileC. (3) `3`-ethyl-`2,4`-dimethylpentanenitrileD. (4) `2`-cyano-`3`ethyl-`4`methylpentane |
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Answer» Correct Answer - C The compound is an alkyl cyanide. `CH_(3)-overset(1CN)overset(2|)(CH)-underset(H_(3)C-overset(4)(CH)-overset(5)(CH_(3)))underset(|)overset(3)(CH)-CH_(2)-CH_(3)` |
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| 32. |
Which of the following is not an alicyclic compound?A. (1) B. (2) C. (3) D. (4) |
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Answer» Correct Answer - A It is an aromatic hydrocarbon. Rest are alicyclic compounds. Alicyclic compounds are those cyclic compounds which resemble the alophatic compounds in many ways. |
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| 33. |
The `IUPAC` name of `CH_(2) = CHCH(CH_(2)CH_(3))underset(Br)underset(|)(C)=CH_(2)` isA. (1) `4`-bromo-`3`-ethylpenta-`1,4`-dieneB. (2) `2`-bromo-`3`-ethylpanta-`1,4`-dieneC. (3) `2`-bromo-`3`-ethylpenta-`1,5`-dieneD. (4) non of these |
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Answer» Correct Answer - B The compound contains two `C=C` bonds, i.e., it is an alkadiene. The numbering starts from the end nearer to the double bond. `overset(5)(CH_(2))=overset(4)(CH)-underset("2-Bromo-3-ethylpenta-1,5-diene")(underset(CH_(2)CH_(3))underset(|)overset(3)(CH)-underset(Br)underset(|)overset(2)(C)=overset(1)(CH_(2)))` The names of substituents should be listed alphabetically. |
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| 34. |
The `IUPAC` name of acraldehyde isA. (1) prop-`2`-en-`1`-alB. (2) propenyladehydeC. (3) but-`2`-en-`1`-alD. (4) propenal |
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Answer» Correct Answer - A Acraldehyde ( also called acrolein) is the simplest unsaturated aldehyde: `underset("Prop-2-en-al")overset(3)(CH_(2)=)overset(2)CH-overset(1)(CHO)` |
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| 35. |
The `IUPAC` name of of `CH_(3)-overset(O)overset(||)(C )-O-CH_(2)-C-=N` isA. (1) methyl cyanoethanoateB. (2) `2`-acetoxymethyl cyanideC. (3) `2`-acetyloxyethaenitrileD. (4) cyanomethyl ethanoate |
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Answer» Correct Answer - D The principal function is `-overset(O)overset(||)(C )-O-` (ester), thus, the compound should be named as alkyl alkanoate: `CH_(3)-underset("Cyanomethyl ethanoate")(overset(O)overset(||)(C )-O-CH_(2)-CN)` |
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| 36. |
Which of the following is a heterocyclic compound ?A. (1) B. (2) C. (3) D. (4) |
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Answer» Correct Answer - D In heterocyclic compounds, at least one atom of the ring system should be a hetero atom, i.e., other than `C` atom. |
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| 37. |
Which of the following is an alicyclic compound ?A. (1) B. (2) C. (3) D. (4) |
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Answer» Correct Answer - A Alicyclic compounds are those carbocyclic compounds which show some kind of resemblance to aliphatic compounds. Compound (1) is a cyclobutadiene showing some resemblance to butadiene. Others are heterocyclic compounds. |
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| 38. |
The correct `IUPAC` name of the compound A. (1) ethylcyclopentaneB. (2) acetylenecyclopentaneC. (3) cyclopentylethyneD. (4) cyclopentylacetylacetylene |
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Answer» Correct Answer - C The compound should be named as the derivated of alkyne because the triple bond (funnctional group) is outside the ring. |
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| 39. |
The `IUPAC` name of the compound isA. (1) acetophenoneB. (2) methyl phenyl ketoneC. (3) `2`-methylethanoneD. (4) `1`-phenylethanone |
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Answer» Correct Answer - D Acetophenone is the specific name while methyl phenyl kenote is the common name of the compound. Numbering should start with the carbonyl `C` atom. |
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| 40. |
The cycloalkane homologous series with only one ring consists of hydrocarbons with the general formula……..where the `C-C` bonds form a ring.A. (1) `C_(n)H_(2n+2)`B. (2) `C_(n)H_(2n)`C. (3) `C_(n)H_(2n-2)`D. (4) `C_(n)H_(2n-4)` |
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Answer» Correct Answer - B For example, cyclohexane, `C_(6)H_(12)`. Formula (1) corresponds to alkanes, formula (3) corresponds to cycloalkanes with two rings, and formula (4) corresponds to cycloakanes with three rings. |
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| 41. |
Which of the following is an alkene? (i) `CH_(3) - CH = CH_(2)` (ii) `CH_(2) = C = CH_(2)` (iii) `CH_(2) = CH - CH = CH_(2)` (iv) `CH_(2) = CH - (CH_(2))_(2) - CH = CH_(2)`A. (1) (i), (ii)B. (2) (i), (ii), (iii)C. (3) (i)D. (4) (i), (ii), (iii), (iv) |
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Answer» Correct Answer - C Alkenes are unsaturated acyclic hydrocarobons containing only one `pi` bond or one carbon-carbon double bond. Other compounds containing two double bonds are dienes. |
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| 42. |
Which of the following is incorrect regarding the alkanes?A. (1) All the bonds in the molecules of alkanes are pi `pi)` bonds.B. (2) The hybridization of two `C` atoms in alkanes is `sp^(2)`.C. (3) There is a large energy barrier to rotation associated with groups joined by a double bond.D. (4) The restricted rotation of groups joined by a double bond causes cis-trans isomerism. |
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Answer» Correct Answer - A The molecules of alkenes contain just one pi `(pi)` bond (present in the carbon-carbon double bond). The rest of the bonds are sigma bonds. The strength of the `pi` bond is `264 kJ mol^(-1)` in comparison to the `sigma` bond `(13-26 kJ mol^(-1))`. |
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| 43. |
Which of the following is incorrect regarding the alkanes?A. (1) All alkynes contain just one triple bond.B. (2) The hybridization of two `C` atoms is `sp` hybridization.C. (3) The carbon-carbon triple bond of alkynes consists of two pi `(pi)` bonds and one sigma `(sigma)` bond.D. (4) There is resitricted rotation of groups joined by a triple bond. |
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Answer» Correct Answer - D Cylindrical symmetry exists along the length of a triple bond due to sideways overlap involving two pairs of `p`-orbitals. As a result, there is no restricted rotation for groups joined by a triple bond. |
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| 44. |
Which of the following is not correct regarding the wedge-and-dashed representation?A. (1) Bonds that project upwards out of the plane of the paper are indicated by a wedge .B. (2) Bonds that lie behind the plane are indicated with a dashed wedge .C. (3) Bonds that lie in the plane of the page are indicated by a line `(-)`.D. (4) For tetrahedral `C` atoms, we draw the two bonds that are in the plane of the page with an an angle of approximately `111^(@)` between them. |
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Answer» Correct Answer - D The angle is approximately `109^(@)`. Notice that a proper three-dimensional perpective requires the wedge-dashed wedge bonds to be drawn near each other on the page, i.e., the atom in front nearly eclipses the atom behind. |
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| 45. |
The structure of isobutyl group in an organic compound isA. (1) `CH_(3)-underset(|)(CH)-CH_(2)-CH_(3)`B. (2) `CH_(3)-CH_(2)-CH_(2)-CH_(2)-`C. (3) `CH_(3)-underset(CH_(3))underset(|)overset(CH_(3))overset(|)(C )-`D. (4) |
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Answer» The prefix iso always describes the following structural unit: `CH_(3)-underset(CH_(3))underset(|)(CH)-` which is present only in fourth alkyl group: `CH_(3)-underset(Isobutyl)underset(CH_(3))underset(|)(CH)-CH_(2)-` |
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| 46. |
Which of the following compound is commonly called met-hyene chloride?A. (1) TetrachloromethaneB. (2) TrichloromethaneC. (3) DichloromethaneD. (4) Chloromethane |
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Answer» Correct Answer - C The compound `CH_(2)Cl_(2)` contains the group `CH_(2)` commonly called methylene. |
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| 47. |
Write the `IUPAC` name of the compound `(A)` in which the molar rations of `C,H`, and `O` of equal having a molecular mass of 58 |
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Answer» Empirical formula of compound : C H O Emprirical formula mass `= 12+1+16 = 19 "g mol"^(-1)` `n=("Molar mass")/("Empirical formula mass")=((58 "g mol"^(-1)))/((29 "g mol"^(-1)))=2` Molecular formula `= C_(2)H_(2)O_(2)` Structural formula `{:("CHO"),(|),("CHO"):}` IUPAC name : Ethanedial. |
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| 48. |
The `IUPAC` name of the compound having the formula `CH-=C-CH=CH_(2)` isA. (1) but-`1`-yn-`3`-eneB. (2) but-`3`-yn-`1`-eneC. (3) but-`3`-en-`1`-yneD. (4) but-`1`-en-`3`-yne |
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Answer» The compounds containing double and triple bonds are called alkynes. For the same set of locants from either direction, `C=C` gets priority over `C-=C`: `overset(4)(CH)-=overset(3)(C )-overset(2)(CH)-overset(1)(CH_(2))` |
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| 49. |
The IUPAC name of `(CH_(3)CH_(2)CO)_(2)O` isA. Propionic anhydrideB. Dipropanoic acidC. Ethoxypropanoic acidD. Propanoic anhydride |
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Answer» Correct Answer - D Propanoic anhydride is the correct answer. |
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| 50. |
The correct IUPAC name of compound with molecular formula `(CH_(3))_(3)C-CH_(3)` isA. PentaneB. 1,1,1-TrimethylethaneC. 2,2-DimethylpropaneD. Neopentane |
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Answer» Correct Answer - C `{:(" "CH_(3)),("1 2| 3"),(CH_(3)-C-CH_(3)),(" |"),(" "CH_(3)),("2,3-Dimethylpropane"):}` |
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