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151.

Which of the following on reductive ozonolysis give only glyoxal?A. Ethylene glycolB. BenzeneC. TolueneD. Cyclobuta-1,3-diene

Answer» Correct Answer - B::D
Discussion
152.

Reductive ozonolysis of allene `CH_(3)-CH=C=CH_(2)` will beA. Only `CH_(3)-CHO`B. Only `CH_(2)O`C. only `CO_(2)`D. mixture of `CH_(3)CHO,HCHO and CO_(2)`

Answer» Correct Answer - D
Discussion
153.

The number of possible alkynes with molecularA. 3B. 4C. 5D. 6

Answer» Correct Answer - A
Discussion
154.

Explain the best feasible path for thhe preparation of compound `CH_(3)-CO-CH_(2)-CH_(3)` from `CH_(3)-CH(Br)-CH_(2)-CH_(3)?`

Answer» `CH_(3)-CH(Br)-CH_(2)-CH_(3)underset(Delta)overset(CH_(3))to`
`CH_(3)-CH=CH-CH_(3)overset(Br_(2))to`
`CH_(3)-CH(Br)-CH(Br)-CH_(3)underset(NaNH_(2),Delta)overset(Alc. KOH)to`
`CH_(3)-C-=C-CH_(3)underset(H_(2)O //H^(+))overset(Hg^(2+))to`
`CH_(3)-CO-CH_(2)-CH_(3)`
Discussion
155.

Which one of the following has the minimum boiling point?A. 1-PentyneB. 1-ButyneC. n-ButaneD. Isobutane

Answer» Correct Answer - D
Discussion
156.

1-pentyne and 2-pentyne can be distinguished byA. Silver mirror testB. Iodoform testC. Addition of `H_(2)`D. Baeyers test

Answer» Correct Answer - A
Discussion
157.

1-Butyne on reductive ozonolysis gives.A. `CH_(3)CH_(2)CH_(2)COOH`B. `2C H_(3)COOH`C. `CH_(3)CH_(2)COCHO`D. `CH_(3)COOH+CH_(3)CHO`

Answer» Correct Answer - C
Discussion
158.

Base strength of (i) `CH_3CH_2^(-)` (ii) `CH_2=CH^(-)` (iii) `CH-=C^(-)`A. `(iii)gt(ii)gt(i)`B. `(i)gt(iii)gt(ii)`C. `(i)gt(ii)gt(iii)`D. `(ii)gt(i)gt(iii)`

Answer» Correct Answer - C
The order of relative basicity is the reverse of the order of relative acidity of the corresponding conjugate acids: Relative acidity: `HC-=CHgtCH_2=CH_2gtCH_3CH_3`. This is on account of the fact that sp hybrid C of ethene has maximum electronegativity while `sp^(3)` hybrid C of ethane has minimum electronegativity.
Relative basicity: `HC-=overlineC:ltCH_2=overline(C)HltCH_3overline(C)H_2`
Discussion
159.

The number of open chain structural isomers possible for `C_(4)H_(6)`A. 6B. 5C. 4D. 3

Answer» Correct Answer - C
Discussion
160.

The monosodium salt of acetylene on treating with methyl chloride formsA. `CH-=C.COOH`B. `CH-=C-CH_(3)`C. `CH_(3)C-=C CH_(3)`D. `CH-=C.CH_(2)CH_(3)`

Answer» Correct Answer - B
Discussion
161.

Acetylene is passed through red hot iron tubes to giveA. `C_(6)H_(6)`B. `C_(2)H_(6)`C. `C_(2)H_(4)`D. all the above

Answer» Correct Answer - A
Discussion
162.

`Al_4C_3,Mg_2C_3` and `CaC_2` are hydrolyzed separately. The hydrocarbons formed are _____ respectively.A. acetylene, methane, methylecetyleneB. methylecetylene, methane, acetyleneC. methanem, methylacetylene, acetyleneD. methylacetylene, acetylene, methane

Answer» Correct Answer - C
`(Al^(3+))_4(C^(4-))_3overset(overset(sigma+)(H)-overset(sigma-)(OH))toCH_4`
`(Mg^(2))_2(C^(3-)-overline(C)-=C)toCH_3C-=CH`
`Ca^(2+)(overline(C)-=overline(C))toCH-=CH`
Discussion
163.

The formulation of polyethene from calcium carbide takes place as follows: `CaC_2+2H_2OtoCa(OH)_2+C_2H_2` `C_2H_2+H_2toC_2H_6` `nC_2H_6to-(CH_2-CH_2)-_n` The amount of polythene obtained from 64 kg of `CaC_2` isA. 7 kgB. 14 kgC. 21 kgD. 28 kg

Answer» Correct Answer - D
64 kg of `CaC_2` corresponds to `10^(3)` mol of `CaC_2` according to the given equation 1 mol of `CaC_2` yields 1 mol of `C_2H_4`. Thus, `10^(3)` mol of `CaC_2` will yield `10^(3)` mol of `C_2H_4` having the mass 28 kg Since during the process of polymerization, mass is conserved the amount of polyethene produced will also be 28kg.
Discussion
164.

Acetylene on ozonolysis with `(O_(3)+Zn//H_(2)O)` givesA. `H-overset(O)overset(||)(C)-overset(O)overset(||)(C)-H`B. `HO-overset(O)overset(||)(C)-overset(O)overset(||)(C)-OH`C. `H_(2)overset(HO)overset(|)(C)-overset(OH)overset(|)(C)H_(2)`D. `CH_(3)-overset(O)overset(||)(C)-H`

Answer» Correct Answer - A
Discussion
165.

Which of the following compounds on hydrolysis gives acetylene ?A. `Na_2C_2`B. `CaC_2`C. `SrC_2`D. `BaC_2`

Answer» Correct Answer - B
`CaCO_3overset(Delta)toCaO+CO_2`
`CaO+3CtoCaC_2+CO`
`CaC_2+2H_2OtoHC-=CH+Ca(OH)_2`
Discussion
166.

Which of the following compounds on hydrolysis gives acetylene ?A. `CaC_(2)`B. `Mg_(2)C_(3)`C. `Al_(4)C_(3)`D. `Cu_(2)Cl_(2)`

Answer» Correct Answer - B
Discussion
167.

Which of the following carbide on hydrolysis gives Acetylene gasA. `Al_(4)C_(3)`B. `Be_(2)C`C. `Be_(2)C`D. `CaC_(2)`

Answer» Correct Answer - D
Discussion
168.

What is the smallest ring that can accommodate a triple bond?A. CyclohexyneB. CycloheptyneC. CyclooctyneD. Cyclononyne

Answer» Correct Answer - C
Discussion
169.

In the conversion of alkyne to trans-alkene by Birch reduction using alkali metals (such as `Na` or `K`) in liquid `NH_3` and alcohol (`MeOH` or `EtOH`), `R - -= - R overset(Na +liq. NH_(3))underset(+EtOH)rarr` the mechanism takes place in the formation of intermediate species in the following sequence:A. (a) Radical anion `rarr` vinylic radical `rarr` trans-vinylic anion `rarr` trans-alkeneB. (b) Radical anion `rarr` trans-vinylic anion `rarr` vinylic radical `rarr` trans-alkeneC. (c) Vinylic radial `rarr` radical anion `rarr` trans-vinylic anion `rarr` trans-alkeneD. (d) Vinylic radical `rarr` trans-vinylic anion `rarr` radical anion `rarr` trans-alkene

Answer» Correct Answer - A
Discussion
170.

Which alkyne will give 3-ethylhexane on catalytic hydrogenation?A. B. C. D. All of these

Answer» Correct Answer - D
Discussion
171.

Which of the following is havin highest heat of hydrogenation?A. B. C. D.

Answer» Correct Answer - D
Discussion
172.

What is the product when acetylene reacts with HCNA. `CH_(3)COCl`B. `CH_(2)=CH-CN`C. `Cl_(2)CHCHO`D. `CICH_(2)COOH`

Answer» Correct Answer - B
Discussion
173.

What is the product formed when acetylene reacts with hypochlorous acid.A. `CH_(3)COCl`B. `ClCH_(2)CHO`C. `Cl_(2)CHCHO`D. `ClCH_(2)COOH`

Answer» Correct Answer - C
Discussion
174.

When acetylene reacts with an excess of hypochlorous acid, the product formed isA. `CHCl=CHOH`B. `Cl_2CHCHO`C. `Cl_2CHCH(OH)_2`D. `ClCH(OH)CH(OH)Cl`

Answer» Correct Answer - B
`CH-=CHoverset(HO-Cl)toClCH=CHOHoverset(HOCl)to[Cl_(2)CHCH(OH)_(2)]tounderset("Dichloroacetaldehyde")(Cl_(2)CHCHO+H_(2)O)`
Discussion
175.

When acetylene is passed inito warm acetic acid (excess) in the presence of mercuric ions as catalyst, the product formed isA. ethyl acetateB. vinyl acetateC. acetic anhydrideD. ethylidene diacetate

Answer» Correct Answer - D
`CH-=CH+H-O-overset(O)overset(||)(C)-CH_(3)overset(Hg^(2+))toCH_(2)=underset("Vinylacetate")(CH-O-overset(O)overset(||)(C)-CH_(3))`
`CH_(2)=CH-O-overset(O)overset(||)(C)-CH_(3)underset(Hg^(2+))overset(CH_(3)-overset(O)overset(||)(C)-OH)tounderset("Ethylidene diacetate")(CH_(3)CH(OOC CH_(3))_(2))`
Discussion
176.

Which of the following method is not used in the preparation of AcetyleneA. DehydrohalogenationB. DehalogenationC. HydrolysisD. Dehydrogenation

Answer» Correct Answer - D
Discussion
177.

Which of the following is the least acidic?A. `H_2O`B. `CH_3CH_2OH`C. `CH-=CH`D. `NH_3`

Answer» Correct Answer - D
Order of relative acidity
`H-OHgtH-ORgtH-C-=CHgtH-NH_2` order of relative basicity
`overline(O)Hltoverline(O)Rltoverline(C)-=CHltoverline(N)H_2`
Note that though N is more electronegative than C atom the basic character of `overline(N)H_3` predominates over its acidic character.
Discussion
178.

Lewisite, a chemical weapon, is prepared by the reaction of acetylene withA. `AsCl_3`B. `SbCl_3`C. `TeCl_3`D. `PCl_3`

Answer» Correct Answer - A
`CH-=CH+AsCl_3toCl-CH=CH-AsCl_2`
Discussion
179.

Find structure of compound A:A. `CH_(2)=CH-overset(Cl)overset(|)(C)H-CH_(3)`B. `H_(2)C=CH-CH=CH_(2)`C. `HC-=C-C-=CH`D. `H_(2)C=CH-C-=CH`

Answer» Correct Answer - D
Discussion
180.

Find structure of compound E:A. B. C. D.

Answer» Correct Answer - C
Discussion
181.

Product (B) isA. B. C. D.

Answer» Correct Answer - B
Discussion
182.

Find structure of compound D:A. B. C. D.

Answer» Correct Answer - B
Discussion
183.

Acetylene `underset(O_2)overset(Cu^(2+)to` The product formed in the reaction isA. `HC-=C-C-=CH`B. `H_2C=CH-C-=CH`C. `H_2C=CH-CH=CH_2`D. `CH_3C-=C CH_3`

Answer» Correct Answer - A
Under oxidative conditions, acetylenic copper compounds undergo coupling to form the dimer:
`HC-=CHoverset(Cu^(2+))toHC-=C-Cuoverset(O_2)toHC-=C-C-=CH`
Discussion
184.

Acetylene `underset(NH_4Cl)overset(CuCl)to` The product formed in the reaction isA. buta-1,3-diyneB. butenyneC. buta-1,3-dieneD. but-2-yne

Answer» Correct Answer - B
With CuCl under mild acidic condition `(NH_4^(+))`, acetylene adds to itself (couples) to form the dimer,
`H_2C=CH-C-=CH`, butenyne or vinylacetylene,
Under basic conditions `(NH_3)`, copper acetylide is formed.
`HC-=CHoverset(Cu(NH_3)_2^(+)overline(O)H)toCu-C-=C-Cu+NH_3+H_2O`
Discussion
185.

`3CH_(3)-C=Choverset(Red hot)underset(Cu tube)rarr`A. B. C. D.

Answer» Correct Answer - C
Discussion