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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. |
`CaC_(2)+H_(2)OtoA+Boverset("1 mole "Na)toCoverset(C_(2)H_(5)I)toD.` D isA. 1-buteneB. PropeneC. 1-penteneD. 1-butyne |
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Answer» Correct Answer - D |
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| 2. |
In the following sequence of reactions the products D is `C-=CH overset(HBr)toAoverset(HBr)toBoverset(alcKOH)toCoverset(NaNH_(2))toD`. D isA. EthanolB. EthyneC. EthanalD. Ethene |
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Answer» Correct Answer - B |
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| 3. |
Cyclic structure `C_(6)H_(5)-CH=CH_(2)overset(Br_(2))toAunderset(NaNH_(2))overset("Three equivalent")toBoverset(CH_(3)I)toC` compound C in the sequence isA. B. C. D. |
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Answer» Correct Answer - B |
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| 4. |
When propyne is treated with aqueous `H_(2)SO_(4)` in presence of `HgSO_(4)`, the major product isA. PropanolB. Propyl hydrogen sulphateC. AcetoneD. Propanol |
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Answer» Correct Answer - C |
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| 5. |
Acetylene on treatment with dil. `H_(2)SO_(4)` having `HgSO_(4)` gives:A. EthaneB. EthanalC. EthanolD. Ethanoic acid |
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Answer» Correct Answer - B |
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| 6. |
The intermediate compound formed when acetylene s hydrated in presence of dil `H_(2)SO_(4)` and `HgSO_(4)` isA. AcetaldehydeB. EthenolC. Vinyl chlorideD. Ethenal |
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Answer» Correct Answer - B |
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| 7. |
Which of the following reagents would convert but-1-yne into but-2-yne?A. ammoniacal `CuCl`B. `(NaNH_2)/(NH_3(1))`C. ammoniacal `AgNO_3`D. Ethanolic `KOH`, heat |
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Answer» Correct Answer - D Acetylene homologues isomerize when heated with ethanolic KOH, the tripe bond moving towards the centre of the chain: `CH_3CH_2C-=CHunderset(KOH)overset("Ehanolic")to[CH_3CH=C=CH_2]toCH_3C-=CCH_3` |
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| 8. |
`CH-=Choverset(HCl)toAoverset("Polymerisation")toB` The polymer B isA. orlonB. PVCC. nylonD. teflon |
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Answer» Correct Answer - B |
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| 9. |
The reagents used to convert (E)-2,3-dibromo-2-butene to 2-butyne A. Zn duct/DB. Mg,DC. NaI/Acetone/DD. alc. KOH |
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Answer» Correct Answer - A::B::C |
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| 10. |
An organic compound decolorizes `Br_2` water and also gives red ppt. with `Cu_2Cl_2` solution the compound isA. `CH_2=CH_2`B. `CH_3CH=CH_2`C. `CH_3C-=CH`D. `CH_3C-=C CH_3` |
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Answer» Correct Answer - C All these compound are capable of decolorizing `Br_2` water as it is a test of unsaturation but only a terminal alkyne is capable of giving a red precipitate with `Cu_2Cl_2` on account of acidic H atom. `CH_3C-=CHoverset(Cu_2Cl_2)tounderset("Red ppt.")(CH_3C-=C C u(s))` |
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| 11. |
`HC-=CHoverset(Dil. H_2SO_4)underset(+Hg^(2+))rarrCH_3CH=0` Which statement(s) is/are correct about the given reaction?A. (a) C atom accepting the H is reduced, and the C atom forming a bond with OH is oxidised.B. (b) Given reaction is a redox reaction.C. (c) The average oxidation number of the two C atoms in each compound is same `(-1)`.D. (d) The average oxidation number of the two C atoms in each compound is same `(-2)`. The net effect is no change in average oxidation state. |
| Answer» Correct Answer - A::C | |
| 12. |
Terminal alkynes hafvfe a acidic hydrogn/s. sodium salt of terminal alkynes behave as nucleophile as well as strong base. For primary alkyl halides it well as strong base. For primary alkyl halides it behave as nucleophile. Thus primary alkyl halides give SN reaction with its salt. Alkynes undergo give SN reaction with its salt. Alkynes undergo electrophilic as well as nucleophilic addition reaction. they also undergo hydroboration, oxidation and ozonolysis. Q. The correct match isA. `{:(A,B,C,D),(3,1,5,2):}`B. `{:(A,B,C,D),(2,1,5,4):}`C. `{:(A,B,C,D),(5,2,1,3):}`D. `{:(A,B,C,D),(3,1,2,4):}` |
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Answer» Correct Answer - D |
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| 13. |
Terminal alkynes hafvfe a acidic hydrogn/s. sodium salt of terminal alkynes behave as nucleophile as well as strong base. For primary alkyl halides it well as strong base. For primary alkyl halides it behave as nucleophile. Thus primary alkyl halides give SN reaction with its salt. Alkynes undergo give SN reaction with its salt. Alkynes undergo electrophilic as well as nucleophilic addition reaction. they also undergo hydroboration, oxidation and ozonolysis. Q. A. `{:(A,B,C,D),(PT,P,QS,RS):}`B. `{:(A,B,C,D),(RS,QS,PT,PT):}`C. `{:(A,B,C,D),(QS,P,PT,RS):}`D. `{:(A,B,C,D),(RS,P,PT,QS):}` |
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Answer» Correct Answer - A |
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| 14. |
Terminal alkynes hafvfe a acidic hydrogn/s. sodium salt of terminal alkynes behave as nucleophile as well as strong base. For primary alkyl halides it well as strong base. For primary alkyl halides it behave as nucleophile. Thus primary alkyl halides give SN reaction with its salt. Alkynes undergo give SN reaction with its salt. Alkynes undergo electrophilic as well as nucleophilic addition reaction. they also undergo hydroboration, oxidation and ozonolysis. Q. `CH_(3)C-=CH+HOX(2equ.)toY`. Y isA. `CH_(3)COCHX_(2)`B. `CH_(3)COCH_(3)`C. `CH_(3)COCOOH`D. `CH_(3)CHXCHO` |
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Answer» Correct Answer - A |
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| 15. |
Terminal alkynes hafvfe a acidic hydrogn/s. sodium salt of terminal alkynes behave as nucleophile as well as strong base. For primary alkyl halides it well as strong base. For primary alkyl halides it behave as nucleophile. Thus primary alkyl halides give SN reaction with its salt. Alkynes undergo give SN reaction with its salt. Alkynes undergo electrophilic as well as nucleophilic addition reaction. they also undergo hydroboration, oxidation and ozonolysis. Q. When 1-pentyne is treated with dil. `H_(2)SO_(4)` and `HgSO_(4)` the product formed isA. 1-pentanolB. pentanalC. 2-pentanoneD. 3-pentanone |
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Answer» Correct Answer - C |
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| 16. |
Terminal alkynes hafvfe a acidic hydrogn/s. sodium salt of terminal alkynes behave as nucleophile as well as strong base. For primary alkyl halides it well as strong base. For primary alkyl halides it behave as nucleophile. Thus primary alkyl halides give SN reaction with its salt. Alkynes undergo give SN reaction with its salt. Alkynes undergo electrophilic as well as nucleophilic addition reaction. they also undergo hydroboration, oxidation and ozonolysis. Q. Compound , Ozonolysis products (A) Acetylene , 1 `HCOCH & CH_(3)CHO` (B) Ethylene , (2) `CH_(3)CHO` (c) Benzene (3) One mole of `(CHO)_(2)` (d) 2-Butene , (4) 2 moles of `(CHO)_(2)` (5) `CH_(2)O`A. `{:(A,B,C,D),(3,2,5,4):}`B. `{:(A,B,C,D),(4,2,1,3):}`C. `{:(A,B,C,D),(3,5,4,2):}`D. `{:(A,B,C,D),(5,3,1,4):}` |
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Answer» Correct Answer - C |
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| 17. |
Which of the following is least preffered to make higher alkynes fom sodium acetylide?A. `CH_3CH_2CH_2I`B. `CH_3CH_3CH_2Br`C. `CH_3CH_2CH_2Cl`D. both (2) and (3) |
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Answer» Correct Answer - C `Na^(+)CH-=C^(-):+CH_3CH_2CH_2Cl to HC-=CH+CH_3CH=CH_2+NaCl` Alkynides are powerful bases but mild nucleophiles. Hence, `E2` eliminations are very competitive with `S_N2` displacements. Relative to `Br^(-)` or `I^(-)`,`Cl^(-)` is a poorer leaving group in `S_N2` reactions. Moreover, on account of higher `-I` affect, Cl is a better acid-strengthening group than `Br` or `I`. Thus, it facilitates the abstractions of `beta` proton from the alkyl halide. Consequently, with `RCl,E2` elimination is the dominant reaction. |
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| 18. |
Acetylide ion `C_2^(2-)`, possessesA. two `sigma` bonds one `pi` bonds and one lone pair of electrons.B. one `sigma` bond, two `pi` bonds and one lone pair of electrons.C. one `sigma` bond, two `pi` bonds, and two lone pairs of electronsD. three `sigma` bonds, and two lone pairs of electrons |
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Answer» Correct Answer - C Carbides of strongly electropositive metals `(Na,K,Ca,Sr,Ba)` are ionic containing the acetylide ion: `[:overlineC-=overlineC:]` |
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| 19. |
Of th following compound, find out number of conjugated unsaturated hydrocarbon those would not show diels alder reaction. |
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Answer» Correct Answer - 5 |
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| 20. |
The set of reagents that needed to carry out the following conversion are `CH_(3)-CH_(2)-C-=CHtoCH_(3)-CH_(2)-CH_(2)-CHO`A. `H_(2)O //HgSO_(4)//H_(2)SO_(4)`B. `B_(2)H_(6)//THF,H_(2)O_(2)//OH^(-)`C. `H_(2)O //H^(+)`D. `Hg(OAC)_(2),H_(2)O,NaBH_(4)` |
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Answer» Correct Answer - B |
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| 21. |
Q. The conversion of (D) to (F) involvesA. Electrophilic additionB. Nucleophilic additionC. Electrophilic substitutionD. Nucleophilic substitution |
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Answer» Correct Answer - D |
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| 22. |
A hydrocarbon (A) having molecular formula `C_(7)H_(14)` is capable to exhibit both geometrical and optical isomerism on oxidation with hot conc. `MnO_(4)` followed by heating with sodalime yields two alkanes (B) and (C). Mixture of B and C can also be formed by oxidatio with hot concentration alkaline `MnO_(4)^(-)` of hydrocarbon (D) having molecular formula `C_(7)H_(12)`, followed by heating with sodalime. Q. The hydrocarbon (D) isA. 5 methyl 2 hexyneB. 1 methyl 2 hexyneC. 4-methyl-2-hexyneD. 6 methyl 2 hexyne |
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Answer» Correct Answer - C |
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| 23. |
`CH_3CHBrCH_2Brunderset(on e equival ent)overset(alc. KOH)toP` identify the main product.A. `CH_3C-=CH`B. `CH_2=CHCH_2Br`C. `CH_3CBr=CH_2`D. `CH_3CH=CHBr` |
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Answer» Correct Answer - D In E2 elimination, the more acidic H is removed preferentially. The negative inductive inductive effect of the Br atoms increases the acidity of the H atoms on the C atoms to which the Br atoms are bonded. Thus, compound (2) is not obtained because its formation involves the removal of least acidic the H atom. A little amount of compound (3) is formed because presence of `CH_3` gourp with positive inductive effect decreases the acidic character of H on C-2. In addition, there is statistical effect: two H on C-1 relative to one H on C-2 Propyne is not formed as we are using only one equivalent of KOH. |
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| 24. |
2,3-Dibromobutene`overset(Reag ent)to`but-2-yne Identify the reagent.A. `Zn`B. `Mg`C. `I^(-)`D. all of these |
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Answer» Correct Answer - D `CH_3CBr=CBrCH_3overset(ZnorMgorI^(-))toCH_3C-=CCH_3` The same reagents are used to dehalogenate vic-dihalides to alkenes. |
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| 25. |
S-I: Reaction of but-2-yne by Na/liq `NH_(3)` gives trans but-2-ene S-II: It is syn addition.A. S-I&II are correct, S-II is correct explanaion of S-IB. S-I&II are correct, S-II is not correct explanation of S-IC. S-I is true, but S-II is falseD. S-I is false, but S-II is true. |
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Answer» Correct Answer - C |
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| 26. |
Acetylene does not react withA. `CH_3Li`B. `CH_3COONa`C. `NaNH_2`D. `NaH` |
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Answer» Correct Answer - B Acid-base reactions always go from the stronger acids and bases to the weaker ones. Therefore acetylene will only react with bases that are converted to acids weaker than acetylene, the order of acidic strength is `CH_3CO_2HgtCH-=CHgtNH_3gtCH_4approxH_2` Thus, acetylene does not react with `CH_3COONa`. |
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| 27. |
Acetylene is acidic but it does not react with NaOH or KOH. Give reason. |
| Answer» Acetylene is very weak acid. The value of dissociation constant `K_(a)` is very low `(10^(-25))`. Thus, it does not react with alkalies like `NaOH` or KOH, but react with very strong base like sodamide `(NaNH_(2))`, active metals like Na,K. | |
| 28. |
Which of the following reagents can distinguish between propene and propyne? (i) `Na` (in hexane) (ii) `Na^(+)NH_2` (in liquid `NH_3`) (iii) `Ag(NH_3)_2^(+)OH^(-)` (iv) `Cu(NH_3)_2^(+)OH^(-)`A. (i),(ii),(iii),(iv)B. (i),(ii)C. (iii),(iv)D. (ii),(iii),(iv) |
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Answer» Correct Answer - A All these tests are based on the acidity of the terminal H of a terminal alkyne. `2CH_3C-=CH+2Natounderset("sodium propynide")(2CH_3C-=C)`:` .^(-)Na^(+)+H_2uarr` `CH_3C-=CH+NaNH_2overset("liq.NH_3")toCH_3C-=C`:` .^(-)Na^(+)+NH_3uarr` `CH_3C-=CHunderset("ammoniacal silver nitrate")(+Ag(NH_3)_2^(+)OH^(-))toCH_3C-=CAg(s)+2NH_3+H_2O` `CH_3C-=CH+underset("Ammoniacal cuprous chloride")(AG(NH_3)_2^(+)OH^(-))toCH_3C-=CAg(s)+2NH_3+H_2O` Similar chemical tests can be used to distinguish propane from propyne. |
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| 29. |
Which of the dihalides undergo a double dehydroahalogenation to give an alkyne?A. vic-dihalideB. gem-dihalideC. `alpha,omega`- dihalideD. Both (1) and (2) |
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Answer» Correct Answer - A `underset("vic-dihalide")(-underset(Br)underset(|)(C)H-underset(Br)underset(|)(C))-overset(NaNH_(2))to-C-=-overset(NaNH_(2))larrunderset("gem-dihalide")(CH_(2)-CBr_(2)^(-))` |
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| 30. |
The number of open chain structural isomers possible formul `C_(5)H_(8)` isA. 7B. 6C. 5D. 4 |
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Answer» Correct Answer - A |
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| 31. |
Match the following |
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Answer» Correct Answer - A::B::C::D |
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| 32. |
Hydration of ethyne to ethanal takes place through the formation ofA. `CH_(3)CH(OH)_(2)`B. `CH_(2)=CHOH`C. `CH_(2)=CHO^(-)`D. `CH-=C^(-)` |
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Answer» Correct Answer - B |
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| 33. |
`Ph-C-=C-Meoverset(20%D_(2)SO_(4)" in "D_(2)O //Hg^(+ +))to(P)` Principal organic product is.A. `Ph-oversetH(O)overset(||)(C)-CD_(2)-Me`B. `Ph-CD_(2)-overset(O)overset(||)(C)-Me`C. `Ph-overset(O)overset(||)(C)-CH_(2)-CHD_(2)`D. `Ph-overset(O)overset(||)(C)-underset(D)underset(|)overset(H)overset(|)(C)-CH_(2)D` |
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Answer» Correct Answer - A |
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| 34. |
What is the product of the following reaction? A. B. C. D. |
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Answer» Correct Answer - B |
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| 35. |
What is the product of the following reaction?A. B. C. D. |
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Answer» Correct Answer - B |
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| 36. |
What is the kinetic product for the following reaction? A. IB. VC. IIID. IV |
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Answer» Correct Answer - B |
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| 37. |
Compound (B) is same when (A) is:A. (a) `Me--=-Me`B. C. (c) `H--=-H`D. |
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Answer» Correct Answer - A::C::D When alkyne is symmetrical, the same product is obtained by (i) catalytical hydration, (ii) mercuration-demercuration, and (iii) hydroboration oxidation reactions. |
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| 38. |
End product B is :A. B. C. D. `Ph-C-=CD` |
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Answer» Correct Answer - A |
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| 39. |
2,3-dibromobutane is treated with sodium amide (excess) in liquid ammonia. The main product isA. but-1-yneB. buta-1,2-dieneC. but-2-yneD. buta-1,3-diene |
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Answer» Correct Answer - C Vic-dihalide undergoes a double dehydrohalogena-tion to give internal alkyne: `CH_(3)-underset(Br)underset(|)(C)H-underset(Br)underset(|)(C)H-CH_(3)underset((2)" "H_(2)O)overset((1)" "NaNH_(2))toCH_(3)C-=C CH_(3)` |
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| 40. |
Chloroethene is treated with sodium amide in liquid ammonia. The major product isA. acetyleneB. ethenamineC. sodium ethynideD. 2-chloroethenamine |
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Answer» Correct Answer - C `CH_2=CH-Clunderset(NH_3)overset(NaNH_2)toCH-=CHunderset(NH_3)overset(NaNH_2)toCH_3-=overline(C)Na^(+)+NH_3` Sodamide in liquid ammonia is a strong base. Thus, it causes the dehydrochlorination of chloroethene to give acetylene. Being acidic in nature, it reacts with `NaNH_2` to form sodium acetylide. |
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| 41. |
Which of the following is/are the major product(s) of the following reaction? A. IB. I and IIC. I and IIID. II |
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Answer» Correct Answer - A |
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| 42. |
Which of the following will yield a mixture of 2-chlorobutene and 3-chlorobutene on treatment with HCl?A. `H_(2)C=C=CH-CH_(3)`B. `H_(2)C=underset(CH_(3))underset(|)(C)-CH=CH_(2)`C. `H_(2)C=CH-CH=CH_(2)`D. `CH-=C-CH=CH_(2)` |
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Answer» Correct Answer - A |
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| 43. |
P and Q are respectively:A. `Ph-overset(O)overset(||)(C)-CH_(3)&Ph-CH_(2)-overset(O)overset(||)(C)-H`B. `Ph-CH_(2)-CHO&Ph-overset(O)overset(||)(C)-H`C. `Ph-overset(O)overset(||)(C)-CH_(3)&Ph-overset(O)overset(||)(C)-CH_(3)`D. `Ph-CH_(2)-CHO&Ph-CH_(2)-CHO` |
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Answer» Correct Answer - B |
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| 44. |
What is/are the product(s) from the following reaction?A. I and IIB. I and IIIC. I and IVD. II and III |
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Answer» Correct Answer - A |
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| 45. |
Hydroboration oxidation and acid hydration will yield the same product in case of:A. B. b. `Me--=-Me`C. D. |
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Answer» Correct Answer - A::B::C::D Same product is obtained with HBO and catalytic hydration reaction with symmetrical alkene or alkyne. |
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| 46. |
`CH_(3)C=CH_(3)overset(BH_(3).THF)underset(CH_(3)COOH)rarrMajor porduct:A. `CH_(3)-CH_(2)-overset(O)overset(||)(C)-CH_(3)`B. `CH_(3)CH_(2)CH_(2)-overset(O)overset(||)(C)-H`C. D. |
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Answer» Correct Answer - D |
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| 47. |
Which of the following statements regarding 1,2- or 1,4- conjugate addition of HBr to 1,3-butadiene is false?A. The kinetic product,3-bromo-1-butene, aroses from the more stable carbocation intermediateB. The thermodynamic product, 1-bromo-2-butene, is the more stable product.C. The kinetic product is favored by carrying out the reaction at high temperature.D. Formation of the two products arises from a common resosnance stabilized carbocation intermediate. |
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Answer» Correct Answer - C |
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| 48. |
Acetone is the major product in: I `H_(2)C=C=CH_(2)overset(H_(3)O)rarr` II `H_(3)C-CH=overset(Hg^(+2)//H_(2)SO_(4))rarr` III `H_(3)C-CH=overset(BH_(3).THF)underst(H_(2)O_(2)//OHrarr`A. IB. IIC. IIID. IV |
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Answer» Correct Answer - A::B |
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| 49. |
Which of the following orders regarding acidic strength is correct.A. `CH_(3)COOHgtCH_(3)CH_(2)OHgtCH-=CH`B. `CH_(3)COOHgtCH-=CHgtCH_(3)CH_(2)OH`C. `CH-=CHgtCH_(3)COOHgtCH_(3)CH_(2)OH`D. `CH-=CHgtCH_(3)CH_(2)OHgtCH_(3)COOH` |
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Answer» Correct Answer - A |
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| 50. |
What is the IUPAC name for the following compound? `CH_(3)-C-=C-overset(CH_(3))overset(|)(C)H-CH=CH_(2)`A. 4-vinyl-2-pentyneB. 4-methylhex-2-yn-5-eneC. 3-methylhex-4-yn-1-eneD. 3-methylhex-1-en-4-yne |
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Answer» Correct Answer - D |
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