How will you separate propene from propyne?

How will you separate propene from propyne?
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Ans. By passing the mixture through ammonical silver nitrate solution when propyne reacts while propene passes over.
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Related questions

Propyne can be converted to propene by using (a) H2 + Lindlar's catalyst (b) NH2NH2 (c) H2 + Pt catalyst (d) NH2NH2 + KOH

Description : Propyne can be converted to propene by using (a) H2 + Lindlar's catalyst (b) NH2NH2 (c) H2 + Pt catalyst (d) NH2NH2 + KOH

Last Answer : H2 + Lindlar's catalyst

Which of the following compounds will show geometrical isomerism? (a) Propene (b) 2-Butene (c) Propyne (d) 2-Butyne

Description : Which of the following compounds will show geometrical isomerism? (a) Propene (b) 2-Butene (c) Propyne (d) 2-Butyne

Last Answer : 2-Butene

Explain the physical properties of benzene and its homologues.

Description : Explain the physical properties of benzene and its homologues.

Last Answer : Ans: i. Benzene and its homologous upto eight carbon atoms are colourless liquids with characteristic smell. ii. Aromatic hydrocarbons are immiscible with water but soluble in organic solvents. iii. ... compounds increases with increase in molecular mass due to increase in van der waals forces.

Out of benzene, m–dinitrobenzene and toluene which will undergo nitration most easily and why?

Description : Out of benzene, m–dinitrobenzene and toluene which will undergo nitration most easily and why?

Last Answer : Ans. -CH3 group is electron donating while –NO2 group is electron withdrawing. Therefore, maximum electron density will be in toluene , followed by benzene and at least in m-dinitrobenzene. Therefore, the ease of nitration decreases in the order: Toluene> benzene> m-dinitrobenzene

Which one is more stable structure of benzene among Kekule and Dewar’s structures?

Description : Which one is more stable structure of benzene among Kekule and Dewar’s structures?

Last Answer : Ans: Kekule’s structure.

Define benzenoids Compounds.

Description : Define benzenoids Compounds.

Last Answer : Ans: Aromatic compounds containing benzene ring.

Define Aromatic Compounds.

Description : Define Aromatic Compounds.

Last Answer : Ans: The Compounds which gives pleasant smell.

What are alkanes? Why are they called paraffins?

Description : What are alkanes? Why are they called paraffins?

Last Answer : Ans. Those hydrocarbons which contain single bond between carbon- carbon are called alkanes. They are called paraffins because they are very less reactive (Latin- Parum= little, affins = affinity)

How will you demonstrate that double bonds of benzene are somewhat different from that of olefins?

Description : How will you demonstrate that double bonds of benzene are somewhat different from that of olefins?

Last Answer : Ans. The double bonds of olefins decolorize bromine water and discharge the pink colour of Bayer‘s reagent while those of benzene not.

What is Grignard reagent?

Description : What is Grignard reagent?

Last Answer : Ans. Alkyl magnesium halides

What is meant by restricted rotation around of carbon-carbon double bond? What type of isomerism does it lead to?

Description : What is meant by restricted rotation around of carbon-carbon double bond? What type of isomerism does it lead to?

Last Answer : Ans. The carbon-carbon double bond in alkene contains one sigma bond and one pi-bond. The Pibond involves the overlapping of unhybridised p orbital of two carbon atom .The rotation around the ... , the free rotation around C=C double bond is restricted, which gives rise to Geometrical Isomerism.

How will you detect the presence of unsaturation in an organic compound?

Description : How will you detect the presence of unsaturation in an organic compound?

Last Answer : Ans. Generally Unsaturated organic compound decolorize Bayer‘s reagent and Bromine water.

Arrange the following in order of decreasing reactivity towards alkanes. HCl, HBr, HI, HF

Description : Arrange the following in order of decreasing reactivity towards alkanes. HCl, HBr, HI, HF

Last Answer : Ans. HI> HBr> HCl >HF

Name two reagents which can be used to distinguish between ethene and ethyne.

Description : Name two reagents which can be used to distinguish between ethene and ethyne.

Last Answer : Ans. Tollen‘s reagent

Out of ethylene and acetylene which is more acidic and why?

Description : Out of ethylene and acetylene which is more acidic and why?

Last Answer : Ans. Acetylene, due to greater electonegativity of the sp hybridised carbon.

Arrange the following in the increasing order of C-C bond length- C2H6 , C2H4, C2H2

Description : Arrange the following in the increasing order of C-C bond length- C2H6 , C2H4, C2H2

Last Answer : Ans. C2H2 < C2H4 < C2H6

What effect does branching of an alkane chain has on its boiling point?

Description : What effect does branching of an alkane chain has on its boiling point?

Last Answer : Ans. As branching increases, the surface area of the molecule decreases which results in a small area of contact. As a result, the Van der Waals force also decreases which can be overcome at ... lower temperature. Hence, the boiling point of an alkane chain decreases with an increase in branching.

What are the necessary conditions for any system to be aromatic?

Description : What are the necessary conditions for any system to be aromatic?

Last Answer : Ans. A compound is said to be aromatic if it satisfies the following three conditions: (i) It should have a planar structure. (ii) The π-electrons of the compound are completely delocalized in the ring. (iii)The total number ... to (4n + 2), where n = 0, 1, 2 etc. This is known as Huckel s rule.

Explain why Grignard reagents do not reacts with alkanes.

Description : Explain why Grignard reagents do not reacts with alkanes.

Last Answer : Ans. In alkanes , the C – H bond has very little polarity . The hydrogen cannot be abstracted by the Grignard reagent.

What are the main constituent of LPG?

Description : What are the main constituent of LPG?

Last Answer : Ans. Butane and isobutane . Both these isomers can be easily liquified and hence can be conveniently transported in iron cylinder.

Is it possible to isolate pure staggered ethane or pure eclipsed ethane at room temperature? Explain .

Description : Is it possible to isolate pure staggered ethane or pure eclipsed ethane at room temperature? Explain .

Last Answer : The energy differences between staggered and eclipsed forms of ethane is just 12.55 kj mol_1 which is easily met by collisions of the molecules at room temperature. Therefore, it is not possible to isolate either pure staggered or pure eclipsed ethane at room temperature.

Which of the following has highest boiling point and why?(L-II) (a) 2 methylpentane (b) 2,3 dimethyl butane (c) 2,2 dimythylbutane

Description : Which of the following has highest boiling point and why?(L-II) (a) 2 methylpentane (b) 2,3 dimethyl butane (c) 2,2 dimythylbutane

Last Answer : Ans. As the branching increases, surface area decreases. As a result, magnitude of Vander Waals forces of attraction decreases and hence the boiling point decreases. Thus, the overall order of decreasing boiling point is: 2 methylpentane (333k) > 2,3 dimethylbutane (331k) > 2,2 dimethylbutane(323k)

Why do the C-C bonds rather than C-H bonds break during cracking of alkanes?

Description : Why do the C-C bonds rather than C-H bonds break during cracking of alkanes?

Last Answer : Ans. Since the bond dissociation energy of C-C bonds (348kj /mol) is lower than bond dissociation energy of C-H bonds (414kj/mol), therefore, during cracking of alkanes, C-C bonds break more early than C-H bonds.

(a) What effect the branching of an alkane has on its melting point? (L-III) (b) Which of the following has highest boiling point?(L-III) (1) 2-methyl pentane. (2) 2, 3-diethyl butane. (3) 2, 2- dimethyl butane.

Description : (a) What effect the branching of an alkane has on its melting point? (L-III) (b) Which of the following has highest boiling point?(L-III) (1) 2-methyl pentane. (2) 2, 3-diethyl butane. (3) 2, 2- dimethyl butane.

Last Answer : Ans.(a) In general conception, as the branching increases packing of the molecules in the crystals becomes less close and have melting point decreases accordingly. (b) As the branching increases, ... attraction decreases and hence the boiling point decreases. So, 2-methyl pentane has highest B.pt.

Arrange the three isomers of pentane in increasing order of their boiling points?

Description : Arrange the three isomers of pentane in increasing order of their boiling points?

Last Answer : Ans.2, 2-Dimethylpropane

What do you mean by pyrolysis?

Description : What do you mean by pyrolysis?

Last Answer : The decomposition of a compound by the heat is called pyrolysis. This process when applied to alkanes is known as cracking.

Why are alkanes called paraffins?

Description : Why are alkanes called paraffins?

Last Answer : Paraffin’s means little affinity; alkanes due to strong C-C and C-H bonds are relatively chemically inert.

What are conformations?

Description : What are conformations?

Last Answer : Conformations are spatial arrangements which are obtained by rotation around sigma bonds.

. 1,1-Dichloropropane reacts with aqueous KOH to give (a) 1,1-Propanediol (b) Acetaldehyde (c) Propanone (d) Propyne

Description : 1,1-Dichloropropane reacts with aqueous KOH to give (a) 1,1-Propanediol (b) Acetaldehyde (c) Propanone (d) Propyne

Last Answer : Acetaldehyde

When propyne is passed through hot iron tube at 400°C, it gives (a) Benzene(b) Toluene(c) m-Xylene(d) Mesitylene

Description : When propyne is passed through hot iron tube at 400°C, it gives (a) Benzene (b) Toluene (c) m-Xylene (d) Mesitylene

Last Answer : Mesitylene

Which of the following compounds does not react with ammoniacal AgNO3 solution? (a) Acetylene (b) 1-Butyne (c) Propyne (d) 2-Butyne

Description : Which of the following compounds does not react with ammoniacal AgNO3 solution? (a) Acetylene (b) 1-Butyne (c) Propyne (d) 2-Butyne

Last Answer : 2-Butyne

Propyne reacts with aqueous H2SO4 in the presence of HgSO4 to form (a) acetone (b) 1-propanol (c) acetaldehyde (d) 2-propanol

Description : Propyne reacts with aqueous H2SO4 in the presence of HgSO4 to form (a) acetone (b) 1-propanol (c) acetaldehyde (d) 2-propanol

Last Answer : acetone

Addition of two moles of HCl to propyne gives : (a) 2,2-Dichloropropane (b) 1,3-Dichloropropane (c) 1,2-Dichloropropane (d) None of these

Description : Addition of two moles of HCl to propyne gives : (a) 2,2-Dichloropropane (b) 1,3-Dichloropropane (c) 1,2-Dichloropropane (d) None of these

Last Answer : 2,2-Dichloropropane

Which of the following compounds on hydrolysis gives propyne? (a) CaC2 (b) Mg2C3 (c) Al4C3 (d) Cu2Cl2

Description : Which of the following compounds on hydrolysis gives propyne? (a) CaC2 (b) Mg2C3 (c) Al4C3 (d) Cu2Cl2

Last Answer : Al4C3

Propyne is formed by (a) Polymerization of acetylene (b) Reaction of acetylene with methane (c) Reaction of acetylene with methyl chloride (d) Reaction of sodium acetylide with methyl chloride

Description : Propyne is formed by (a) Polymerization of acetylene (b) Reaction of acetylene with methane (c) Reaction of acetylene with methyl chloride (d) Reaction of sodium acetylide with methyl chloride

Last Answer : Reaction of sodium acetylide with methyl chloride

Which of the following statements is not true about propyne, HC–C≡CH3? (a) It contains six sigma bonds. (b) It contains three pi bonds. (c) The H–C–H bond angle is about 109.5°. (d) The C–C–C bond angle is 180°.

Description : Which of the following statements is not true about propyne, HC–C≡CH3? (a) It contains six sigma bonds. (b) It contains three pi bonds. (c) The H–C–H bond angle is about 109.5°. (d) The C–C–C bond angle is 180°.

Last Answer : It contains three pi bonds

In propyne there are (a) six σ bonds and two π bonds(b) seven σ bonds and one π bond(c) six σ bonds and one π bond(d) eight σ bonds

Description : In propyne there are (a) six σ bonds and two π bonds (b) seven σ bonds and one π bond (c) six σ bonds and one π bond (d) eight σ bonds

Last Answer : six σ bonds and two π bonds

Which of the following chemical compounds is an important aromatic hydrocarbon. Is it: w) methane x) ethane y) benzene z) propyne

Description : Which of the following chemical compounds is an important aromatic hydrocarbon. Is it: w) methane x) ethane y) benzene z) propyne

Last Answer : ANSWER: Y -- BENZENE

Natural rubber is a polymer of – (1) Vinyl acetate (2) Propene (3) Isoprene (4) Styrene

Description : Natural rubber is a polymer of – (1) Vinyl acetate (2) Propene (3) Isoprene (4) Styrene

Last Answer : (3) Isoprene Explanation: Natural rubber consists of suitable polymers of the organic compound isoprene, with minor impurities of other organic compounds plus water. Isoprene is produced and emitted by ... trees into the atmosphere (major producers are oaks, poplars, eucalyptus, and some legumes).

PVC is formed by polymerization of - (1) Styrene (2) Acetylene (3) Propene (4) Vinyl Chloride

Description : PVC is formed by polymerization of - (1) Styrene (2) Acetylene (3) Propene (4) Vinyl Chloride

Last Answer : (4) Vinyl Chloride Explanation: Polyvinyl chloride is produced by polymerization of the vinyl chloride monomer (VCM). About 80% of production involves suspension polymerization.

Natural rubber is a polymer of (a) Propene (b) Isoprene (c) Formaldehyde(d) Phenol

Description : Natural rubber is a polymer of (a) Propene (b) Isoprene (c) Formaldehyde (d) Phenol

Last Answer : Isoprene

Which of the reactions between the following pairs of reagents proceeds by a mechanism that may be described as an electrophilic substitution? (a) Benzene + Br2/FeBr3 (b) Propene + Br2 (c) Acetone + NH2NH2 (d) Ethyl bromide + aq KOH

Description : Which of the reactions between the following pairs of reagents proceeds by a mechanism that may be described as an electrophilic substitution? (a) Benzene + Br2/FeBr3 (b) Propene + Br2 (c) Acetone + NH2NH2 (d) Ethyl bromide + aq KOH

Last Answer : Benzene + Br2/FeBr3

Benzene reacts with propene in the presence of H2SO4 catalyst to give (a) n-Propylbenzene (b) Benzophenone (c) Cumene (d) Nothing happens

Description : Benzene reacts with propene in the presence of H2SO4 catalyst to give (a) n-Propylbenzene (b) Benzophenone (c) Cumene (d) Nothing happens

Last Answer : Cumene

Glycerol on warming with a small amount of hydriodic acid gets converted to (a) Propene (b) 3-Iodopropene (c) 1,3-Diiodopropane (d) 2-Iodopropane

Description : Glycerol on warming with a small amount of hydriodic acid gets converted to (a) Propene (b) 3-Iodopropene (c) 1,3-Diiodopropane (d) 2-Iodopropane

Last Answer : 3-Iodopropene

Hydroboration-oxidation of propene gives : (a) Isopropyl alcohol (b) n-Propyl alcohol (c) Isobutyl alcohol (d) tert-Butyl alcohol

Description : Hydroboration-oxidation of propene gives : (a) Isopropyl alcohol (b) n-Propyl alcohol (c) Isobutyl alcohol (d) tert-Butyl alcohol

Last Answer : n-Propyl alcohol

2,2-Dichloropropane reacts with aqueous KOH to give (a) 2,2-Propanediol (b) Propanal (c) Acetone (d) Propene

Description : 2,2-Dichloropropane reacts with aqueous KOH to give (a) 2,2-Propanediol (b) Propanal (c) Acetone (d) Propene

Last Answer : Acetone

Isopropyl bromide reacts with alcoholic KOH to give (a) Propene (b) Isopropyl alcohol (c) Propane (d) n-Propyl alcohol

Description : Isopropyl bromide reacts with alcoholic KOH to give (a) Propene (b) Isopropyl alcohol (c) Propane (d) n-Propyl alcohol

Last Answer : Propene

Which of the following statements about propene, CH3CH=CH2, is correct? (a) All nine atoms lie in the same plane. (b) The compound has a cis and trans isomer. (c) There is a total of eight sigma bonds. (d) All the carbon atoms are sp2 hybridized

Description : Which of the following statements about propene, CH3CH=CH2, is correct? (a) All nine atoms lie in the same plane. (b) The compound has a cis and trans isomer. (c) There is a total of eight sigma bonds. (d) All the carbon atoms are sp2 hybridized

Last Answer : There is a total of eight sigma bonds.

Which of the following alkenes gives only acetic acid on oxidation with hot concentrated KMnO4. (a) Ethylene (b) 1-Butene (c) Propene (d) 2-Butene

Description : Which of the following alkenes gives only acetic acid on oxidation with hot concentrated KMnO4. (a) Ethylene (b) 1-Butene (c) Propene (d) 2-Butene

Last Answer : 2-Butene

Propene reacts with Cl2 in H2O to give (a) 1-Chloro-2-propanol (b) 2-Chloro-2-propanol (c) 1-Chloro-1-propanol (d) 2-Chloro-1-propano

Description : Propene reacts with Cl2 in H2O to give (a) 1-Chloro-2-propanol (b) 2-Chloro-2-propanol (c) 1-Chloro-1-propanol (d) 2-Chloro-1-propano

Last Answer : 1-Chloro-2-propanol