995 + Interview Questions in HYDROCARBONS IN GENERAL AWARENESS Page 18 InterviewSolution

851.	What is the general formula of alkanes?
Answer» General formula of alkenes : C_nH_2n+2

Discussion

852.	What is the general formula of alkanes?
Answer» C_nH_2n+2............

Discussion

853.	Give the general formula of alkenes.
Answer» The general formula of alkenes is C_nH_2n.

Discussion

854.	Write the general formula of alkenes.
Answer» C_nH_2n ..........

Discussion

855.	What is the general formula of alkynes?
Answer» C_nH_2n-2.........

Discussion

856.

Alkynes have general formula …………. (A) CnH2n - 2(B) CnH2n(C) CnH2n + 2(D) CnH2n + 1

Answer»

Correct option is: (A) \(C_nH_{2n - 2}\)

Hydrocarbon	General Formula
i) Alkane	\(C_nH_{2n + 2}\)
ii) Alkene	\(C_nH_{2n }\)
iii) Alkyne	\(C_nH_{2n - 2}\)

Correct option is (A) C_nH_{2n - 2}

Discussion

857.	Give the general formula of alkynes.
Answer» The general formula of alkynes is C_nH_2n-2

Discussion

858.	What are alkadiynes and alkatriynes? Give one example of each.
Answer» The aliphatic unsaturated hydrocarbons containing two and three carbon-carbon triple bonds in their structure are called alkadiynes and alkatriynes, respectively. e.g. CH ≡ C – CH₂ – C ≡ CH Alkadiyne (Penta-1,4-diyne) HC ≡ C- C ≡ C- C ≡ CH Alkatriyne (Hexa-1,3,5-triyne)

858.

What are alkadiynes and alkatriynes? Give one example of each.

Answer»

The aliphatic unsaturated hydrocarbons containing two and three carbon-carbon triple bonds in their structure are called alkadiynes and alkatriynes, respectively.

e.g. CH ≡ C – CH₂ – C ≡ CH

Alkadiyne (Penta-1,4-diyne)

HC ≡ C- C ≡ C- C ≡ CH

Alkatriyne (Hexa-1,3,5-triyne)

Discussion

859.	What is the hybridisation of carbon atoms in acetylene?
Answer» The hybridisation of carbon atoms in acetylene is sp.

Discussion

860.	Reaction of alkene and paracid gives oxirane. This reaction is named as-A. PeroxidationB. OxidationC. Prilezhaev ReactionD. None
Answer» Correct Answer - C

Discussion

861.	What is a vicinal dihalide?
Answer» A compound with halogen atoms on adjacent carbon atom.

Discussion

862.	Alkene and alkyne gives following types of polymerisation-A. AdditionB. CondensationC. substitutionD. Replacement
Answer» Correct Answer - A

Discussion

863.	Write the uses of alkane.
Answer» Uses of alkanes: First four alkanes are used as a fuel mainly for heating and cooking purpose. For example, LPG and CNG. CNG, petrol and diesel are used as fuel for automobiles. Lower liquid alkanes are used as solvent. Alkanes with more than 35 C atoms (tar) are used for road surfacing. Waxes are high molecular weight alkanes. They are used as lubricants. They are also used for the preparation of candles and carbon black that is used in manufacture of printing ink, shoe polish, etc.

863.

Write the uses of alkane.

Answer»

Uses of alkanes:

First four alkanes are used as a fuel mainly for heating and cooking purpose. For example, LPG and CNG.
CNG, petrol and diesel are used as fuel for automobiles.
Lower liquid alkanes are used as solvent.
Alkanes with more than 35 C atoms (tar) are used for road surfacing.
Waxes are high molecular weight alkanes. They are used as lubricants. They are also used for the preparation of candles and carbon black that is used in manufacture of printing ink, shoe polish, etc.

Discussion

864.	Give an example of alkyne.
Answer» Acetylene CH ≡ CH

Discussion

865.	Why are alkenes called olefins?
Answer» Because they are oily forming compounds i.e., most of the oils are unsaturated.

Discussion

866.	i. Write the general molecular formula of alkenes. ii. Why are alkenes also known as olefins?
Answer» i. Alkenes have general formula C_nH_2n , where, n = 2,3,4… etc. ii. Alkenes are also known as olefins because the first member ethene/ethylene reacts with chlorine to form oily substance. [Note: Alkenes with one carbon-carbon double bond, contain two hydrogen atoms less than the corresponding alkanes.]

866.

i. Write the general molecular formula of alkenes. ii. Why are alkenes also known as olefins?

Answer»

i. Alkenes have general formula C_nH_2n , where, n = 2,3,4… etc.

ii. Alkenes are also known as olefins because the first member ethene/ethylene reacts with chlorine to form oily substance.

[Note: Alkenes with one carbon-carbon double bond, contain two hydrogen atoms less than the corresponding alkanes.]

Discussion

867.	In which of the following pairs, the vrominatio of first member is eacier than the second member ?A. (a) Isobutane, `n-`butaneB. (b) `n-`Butane, isobutaneC. (c) Methane,ethaneD. (d) none of these
Answer» Correct Answer - a For photochemical halogenation `(` bromination `)` reactivity of hydrogen atom is `3^(@)Hgt2^(@)Hgt1^(@)H`.

Discussion

868.	The addition of tetraethyl lead to petrolA. Lowers its octane numberB. Has no effect on octane numberC. May raise or lower the octane numberD. Raises its octane number.
Answer» Correct Answer - d Tetraethyl lead is anti`-` knocking agent it increases the octane no. of the fuel

Discussion

869.	Which of the following alkenes will show geometrical isomerism ? (i) Propene, (ii) But-2-ene , (iii) But-1-ene , (iv) 2, 3-Dimethylbut-2-ene
Answer» Correct Answer - (ii) But-2-ene

Discussion

870.	Arrange the following alkanes in increaseing order of their enthalpy A. `RltSltQltP`B. `RltSltPltQ`C. `PltQltRlts`D. `PltQltSltR`
Answer» Correct Answer - A As the no of `alpha`-H increases stability increases and heat of hydrogenation decreases.

Discussion

871.	Acetylene reacts with nitrogen in the presence of electric spark to produceA. AmmoniaB. PyrroleC. Hydrocyanic acidD. Pyridine.
Answer» Correct Answer - C

Discussion

872.	Discuss about structural isomerism and stereoisomerism.
Answer» Structural Isomerism: Compounds having the same molecular formula but different structure i.e. different arrangement of atoms within the molecule are called structural isomers and the phenomenon is called as structural isomerism. Types: • Chain isomerism • Position isomerism • Functional isomerism • Metamerism • Tautomerism Stereoisomerism: Isomers which have the same structural formula but have different relative arrangement of atoms or groups in space are called stereoisomers and the phenomenon is called as stereoisomerism.

872.

Discuss about structural isomerism and stereoisomerism.

Answer»

Structural Isomerism: Compounds having the same molecular formula but different structure i.e. different arrangement of atoms within the molecule are called structural isomers and the phenomenon is called as structural isomerism.

Types:

• Chain isomerism

• Position isomerism

• Functional isomerism

• Metamerism

• Tautomerism

Stereoisomerism: Isomers which have the same structural formula but have different relative arrangement of atoms or groups in space are called stereoisomers and the phenomenon is called as stereoisomerism.

Discussion

873.	Out of the following which pentadiens shows double bond character between `C_(2) -C(3)` bond although it appers to be a single bondA. `CH_(3)-CH=C=CH-CH_(3)`B. `CH_(2)=CH-CH=C-CH_(3)`C. `CH_(3)CH_(2)-CH=CH_(2)`D. `CH_(2)=CH-CH_(2)-CH=CH_(2)`
Answer» Correct Answer - B Due to delocalisation of `pi` electrons `C_(2)-C_(3)` bond acquired double bond character.

Discussion

874.	How many transition states and intermediates will be formed during the course of following reaction? A. 3 transition states and 3 intermediatesB. 4 transition states and 3 intermediatesC. 3 transition states and 2 intermediatesD. 5 transition states and 4 intermediates
Answer» Correct Answer - b Transtion state = Intermediate +1

Discussion

875.	Ethylene can be separated from acetylene by passing the mixture throughA. fuming `H_2SO_4`B. pyrogallolC. ammoniacal `Cu_2Cl_2`D. charcoal powder
Answer» Correct Answer - C

Discussion

876.	Propene `(CH_(3)-CH=CH_(2))` can be transformed to compounds (a to j) listed in the left-hand column. Write letter designating the reagent, you believe desired transformation. In the case of multi-step sequence write the reagent in the order they are to be used.
Answer» Correct Answer - a-D; b-A,C; c-B,E; d-A,C,F; e-B,E,F; f-F; g-G; h-I,K; i-B,E,I; j-D,I. (a) Halogenation (b)Oxymercuration-De-mercuration reaction (OMDM reaction) (c) Hydroboration-oxidation reaction (HBO reaction) (d) `CH_(3)CH=CH_(2)overset(OMDM)(to)CH_(3)-overset(O)overset(\|\|)(C)-CH_(3)overset(HOBr)underset("oxidising agent")(to)CH_(3)-CH_(2)-CHO` (h) Halohydrin formation (g) Oxidation reaction (i) `CH_(3)-CH=CH_(2)overset(HBO)(to)CH_(3)-CH_(2)-CH_(2)-OHoverset(SOCl_(2))underset("Darzene process")(to)CH_(3)-CH_(2)-CH_(2)-Cl+SO_(2)+HCl` (j) Halogenation and elimination

Discussion

877.	What effect does branching of an alkane chain has on its boiling points?
Answer» Branching of an alkane chain makes the molecules more compact and brings the various atoms closer. As a result, the molecular size decreases. This decreases the surface area and therefore, the magnitude of van der Waals forces also decreases. Hence, the boiling point of the alkane decreases with branching.

Discussion

878.	What effect does branching of an alkane chain has on its boiling point?
Answer» 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 a relatively lower temperature. Hence, the boiling point of an alkane chain decreases with an increase in branching.

Discussion

879.	How many of the following on reductive ozonolysis will give only glyoxal ? 1,3-butadiene, ethylene, acetylene, o-xylene, m-xylene, p-xylene, benzene, cyclobutadiene, cyclooctateraene
Answer» Correct Answer - 4 Four , acetylene, benzene, cyclobutadiene, cyclooctatetraene.

Discussion

880.	Which of the following molecules have zero dipole moment ? cis-1,2-dichloroethene, trans-1,2-dichloroethene, 1,1-dichloroethene, trans-2-pentene, cis-2-pentene, 1-butyne, 2-butyne , trans-2-butene, cis-2-butene.
Answer» Correct Answer - 3 Three , trans-1,2-dichloroethene, trans-2-butene, 2-butyne.

Discussion

881.	Ozonolysis of a compound Agathene dicarboxylic acid gives following compounds: On complete reduction by `Na-EtOH`. Agathene dicarboxylic acid give hydrocarbon `C_(20)H_(38)` which have 5 chiral carbon it. Q. Structure of product formed when agathene dicarboxylic acid is heated with soda lime is:A. B. C. D.
Answer» Correct Answer - A

Discussion

882.	Ozonolysis of a compound Agathene dicarboxylic acid gives following compounds: On complete reduction by `Na-EtOH`. Agathene dicarboxylic acid give hydrocarbon `C_(20)H_(38)` which have 5 chiral carbon it. Q. Total stereoisomers possible for agathene dicarboxylic acid are:A. `16`B. `18`C. `32`D. `64`
Answer» Correct Answer - B

Discussion

883.	Ozonolysis of a compound Agathene dicarboxylic acid gives following compounds: On complete reduction by `Na-EtOH`. Agathene dicarboxylic acid give hydrocarbon `C_(20)H_(38)` which have 5 chiral carbon it. Q. How many chiral carbon are present in Agathene dicarboxylic acid:A. `2`B. `3`C. `4`D. `5`
Answer» Correct Answer - C

Discussion

884.	A hydrocarbon of formula `C_(6)H_(12)` decolourises bromine water. It also gives precipatate with ammonical `AgNO_(3)` solution. The hydrocarbon isA. 1,3,5-CyclohexatrieneB. 1,5-HexadiyneC. 2,4-HexadiyneD. None of these
Answer» Correct Answer - B Terminal alkynes give white ppt. with ammonical `AgNO_(3)` It is therefore, 1-5-hexadiyne. `underset("1,5-Hexadiyne")(HC-=C-CH_(2)-CH_(2)-C-=CH)`

Discussion

885.	A hydrocarbon A, adds one mole of hydrogen in presence of platinum catalyst to form n-hexane when A is oxidised vigorously with `KMnO_4` , a single carboxylic acid containing three carbon atoms isolated . Give the structure of A and explain.
Answer» (i)Since the hydrocarbon A adds one mole of `H_2` in presence of Pt to form n-hexane, therefore, A must be an hexene. (ii)Since A on vigorous oxidation with `KMnO_4` gives a single carboxylic acid containing three carbon atoms, therefore A must be a symmetrical hexene, i.e., hex-3-ene. `underset"Hex-3-ene (A)"(CH_3CH_2CH=CHCH_2CH_3) underset(KMnO_4)overset"[O]"to underset"Propionic acid"(2CH_3CH_2COOH)` Thus, the given hydrocarbon A is hex-3-ene.

Discussion

886.	Benzene on treatment with a mixture of conc. `HNO_(3)` and con. `H_(2)SO_(4)` at 373K givesA. NitrobenzeneB. m-DintrobenzeneC. p-DintrobenzeneD. n-Dinitrobenzene
Answer» Correct Answer - B Conc. `HNO_(3)` +Conc. `H_(2)SO_(4)` (nitrating mixture) reacts with benzene to give nitrobenzene at 323Kand m-dinitrobenzene at 373K.

Discussion

887.	In the nitration of benzene with conc. `HNO_(3)` and conc `H_(2)SO_(4)` the electrophile acting group isA. `NO_(2)`B. `NO`C. `overset(+)(N)O_(2)`D. `NO_(3)^(-)`
Answer» Correct Answer - C

Discussion

888.	Nitration of benzene is carried out with conc. `HNO_(3)` in presence of conc. `H_(2)SO_(4)`. The role of conc. `H_(2)SO_(4)` is to provideA. nucleophile during the reactionB. free radical during the reactionC. electrophile during the reactionD. catalyst during the reaction
Answer» Correct Answer - C Electrophile `NO_(2)^(+)` is generated by the help of `H_(2)SO_(4)`. In absence of `H_(2)SO_(4)` a nucleophile `NO_(3)^(-)` will be formed which will not helpful in electrophilic substitution.

Discussion

889.	Attacking or reactive or electrophilic species in nitration of benzene is or In the nitration of benzene with concentrated `HNO_(3)` and `H_(2)SO_(4)`, the attck on ring is made by `:`A. `NO_(2)^(-)`B. `NO_(2)^(+)`C. `NO_(3)^(-)`D. `NO_(2)`
Answer» Correct Answer - b b

Discussion

890.	Consider the nitration of benzene using mixed conc. `H_(2)SO_(4)` and `HNO_(3)`. If a large amount of `KHSO_(4)` is added to the mixture, the rate of nitration will be `:`A. doubledB. fasterC. slowerD. unchanged
Answer» Correct Answer - c If large amount of `KHSO_(4)` is added, concentration of `NO_(2)^(+)` will decrease and hence the rate of nitration will be slower.

Discussion

891.	Assertion `:` A mixture of `HNO_(3)` and `H_(2)SO_(4)` is used for the nitration of benzene. Reason `: H_(2)SO_(4)` works as an acid `HNO_(3)` as a base to produce `NO_(2)^(+)` ioni.A. If both assertion and reason are true and the reason is the correct explanation of the assertion.B. If both assertion and reason are true but reason is not the correct explanation of the assertion.C. If assertion is true but reason is false.D. If assertion is false but reason is true.
Answer» Correct Answer - a `2H_(2)SO_(4)+HNO_(3) rarr NO_(2)^(+)+2HSO_(4)^(-)+H_(3)O^(+)`

Discussion

892.	During nitration of benzene withnitrating mixture, `HNO_(3)` acts asA. an acidB. a baseC. catalystD. reducing agent
Answer» Correct Answer - c Electrophilic substitution reactions involve two steps, cleavage of the `C-H` or `C-D` step `(i.e.` proton elimination `)` take place in the second `(` fast `)` step, which being fast does not affect the rate of reaction. The first `(` slow `)` step is the formation of carbocation in chis `C-H` or `C-D` bond is not affected. Thus absence of isotopic effect establishes the two `-` steps mechanism for electrophilic armaic substitution in which formation of carbocation `(` first step `)` is rate determining step.

Discussion

893.	Assertion. Alkynes are more reactive towards nucleophilic addition reaction as compared to alkenes Reason. Alkynes contain two pi bonds, while alkenes have only one pi bondA. If both assertion and reason are true, and reason is the true explanation of the assertion.B. If both assertion and reason are true, but reason is not the true explanation of the assertion.C. If assertion is true, but reason is false.D. If both assertion and reason are false
Answer» Correct Answer - C Correct reason. Since sp-hybridized carbon in alkynes is more electronegative than `sp^2`-hybridized carbon in alkenes , therefore, nucleophiles can attack sp-hybridized carbon more easily than `sp^2`-carbon in alkenes.

Discussion

894.	What is the unit called from which polymers are made?
Answer» Correct Answer - Monomers.

Discussion

895.	Addition of water to alkenes in presence of conc. `H_(2)SO_(4)` produces alcohol Which rule is followed in this reaction?
Answer» Correct Answer - Markovnikov rule,

Discussion

896.	Complete the given reaction of alkene with `KMnO_(4)` in different condition. (i) `CH_(3)-CH_(2)-underset(CH_(3))underset(\|)(C)=CH_(2)underset(273K)overset("Alkaline" KMnO_(4))rarr`
Answer» `CH_(3)-CH_(2)-underset(OH)underset(\|)overset(CH_(3))overset(\|)(C)-underset(OH)underset(\|)(CH_(2))` (ii) `CH_(3)-CH_(2)-overset(O)overset(\|\|)(C)-CH_(3)+CO_(2)+H_(2)O`

Discussion

897.	The reactioin `CH-=CH+NaNH_(2) to CH-=c^(-)Na^(+)+NH_(3)` shows that the hdyrogen atoms of teminal acteylene areA. AcidicB. BasicC. NeutralD. Amphoteric
Answer» Correct Answer - A `overset(+)(Na)overset(-)(NH_(2))` is a strong base and abstracts proton from neutral terminal alkune to form `NH_(3)` and `R--C-=Can`

Discussion

898.	Consider the following reaction `RONa+H_(2)C to ROH+NaOH` `ROH+NaNH_(2) to RONa+NH_(3)` Predict which of the following order reagarding base strength is correct.A. `OH^(-)lt NH_(2)^(-) lt RO^(-)`B. `NH_(2)^(-)lt OH^(-) lt RO^(-)C. `OH^(-)lt RO^(-) lt NH_(2)^(-)D. `RO^(-)lt NH_(2)^(-) lt OH^(-)
Answer» Correct Answer - C `R-overset(-)(Ona^(+)) +H_(2)O to ROH+NaOH` `ROH+NaNH_(2) to RONa+NH_(3)` Since the reaction is favoured in forward direction, `RO^(-)` is stronger base than `OH^(-)`. According to the second reaction `NH_(2)^(-)` is stronger than `RO^(-) as NH_(2)^(-) "forms" NH_(3)`. The order of basic strength if `OH^(-) lt RO^(-) lt NH_(2)^(-)` .

Discussion

899.	`CH_3CH_2-CH=CH_2+HBr overset"ROOR"to underset"Major"[X]+underset"Minor"[Y]` [X] and [Y] respectively areA. `BrCH_2CH_2CH=CH_2` and `C_2H_5-CHBr-CH_3`B. `C_2H_5-CH_2CH_2-Br` and `Br-CH_2CH_2-CH=CH_2`C. `C_2H_5-CH_2-CH_2Br` and `C_2H_5-CHBr -CH_3`D. `C_2H_5CHBr-CH_3` and `C_2H_5-CH_2-CH_2Br`
Answer» Correct Answer - C `CH_3CH_2-CH=CH_2+HBr overset"RCOOR"to underset"[X]"(CH_3CH_2CH_2CH_2Br)+underset"[Y]"(CH_3CH_2-CHBr-CH_3) -=underset"[X]"(C_2H_5-CH_2CH_2Br) + underset"[Y]"(C_2H_5-CHBr-CH_3)`

Discussion

900.	In the alkane, `CH_3CH_2-C(CH_3)_2 -CH_2-CH(CH_3)_2`, identify the `1^@,2^@,3^@` carbon atoms and give the number of H-atoms bonded to each one of these.
Answer» The expanded formula of the given compound is `Hoverset(1^@)-undersetundersetH\|oversetoversetH\|Coverset(2^@)-undersetundersetH\|oversetoversetH\|Coverset(4^@)-undersetundersetunderset(1^@)(CH_3)\|oversetoversetoverset(1^@)(CH_3)\|Coverset(2^@)-undersetundersetH\|oversetoversetH\|Coverset(3^@)-undersetundersetunderset(1^@)(CH_3)\|oversetoversetoverset(1^@)(CH_3)\|C-H` 15 H attached to five `1^@` carbon 4 H attached to two `2^@` carbons 1 H attached to one `3^@` carbon

Discussion

Explore topic-wise InterviewSolutions in .

What is the general formula of alkanes?

What is the general formula of alkanes?

Give the general formula of alkenes.

Write the general formula of alkenes.

What is the general formula of alkynes?

Alkynes have general formula …………. (A) CnH2n - 2(B) CnH2n(C) CnH2n + 2(D) CnH2n + 1

Give the general formula of alkynes.

What are alkadiynes and alkatriynes? Give one example of each.

What is the hybridisation of carbon atoms in acetylene?

Reaction of alkene and paracid gives oxirane. This reaction is named as-A. PeroxidationB. OxidationC. Prilezhaev ReactionD. None

What is a vicinal dihalide?

Alkene and alkyne gives following types of polymerisation-A. AdditionB. CondensationC. substitutionD. Replacement

Write the uses of alkane.

Give an example of alkyne.

Why are alkenes called olefins?

i. Write the general molecular formula of alkenes. ii. Why are alkenes also known as olefins?

In which of the following pairs, the vrominatio of first member is eacier than the second member ?A. (a) Isobutane, `n-`butaneB. (b) `n-`Butane, isobutaneC. (c) Methane,ethaneD. (d) none of these

The addition of tetraethyl lead to petrolA. Lowers its octane numberB. Has no effect on octane numberC. May raise or lower the octane numberD. Raises its octane number.

Which of the following alkenes will show geometrical isomerism ? (i) Propene, (ii) But-2-ene , (iii) But-1-ene , (iv) 2, 3-Dimethylbut-2-ene

Arrange the following alkanes in increaseing order of their enthalpy A. `RltSltQltP`B. `RltSltPltQ`C. `PltQltRlts`D. `PltQltSltR`

Acetylene reacts with nitrogen in the presence of electric spark to produceA. AmmoniaB. PyrroleC. Hydrocyanic acidD. Pyridine.

Discuss about structural isomerism and stereoisomerism.

Out of the following which pentadiens shows double bond character between `C_(2) -C(3)` bond although it appers to be a single bondA. `CH_(3)-CH=C=CH-CH_(3)`B. `CH_(2)=CH-CH=C-CH_(3)`C. `CH_(3)CH_(2)-CH=CH_(2)`D. `CH_(2)=CH-CH_(2)-CH=CH_(2)`

How many transition states and intermediates will be formed during the course of following reaction? A. 3 transition states and 3 intermediatesB. 4 transition states and 3 intermediatesC. 3 transition states and 2 intermediatesD. 5 transition states and 4 intermediates

Ethylene can be separated from acetylene by passing the mixture throughA. fuming `H_2SO_4`B. pyrogallolC. ammoniacal `Cu_2Cl_2`D. charcoal powder

Propene `(CH_(3)-CH=CH_(2))` can be transformed to compounds (a to j) listed in the left-hand column. Write letter designating the reagent, you believe desired transformation. In the case of multi-step sequence write the reagent in the order they are to be used.

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

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

How many of the following on reductive ozonolysis will give only glyoxal ? 1,3-butadiene, ethylene, acetylene, o-xylene, m-xylene, p-xylene, benzene, cyclobutadiene, cyclooctateraene

Which of the following molecules have zero dipole moment ? cis-1,2-dichloroethene, trans-1,2-dichloroethene, 1,1-dichloroethene, trans-2-pentene, cis-2-pentene, 1-butyne, 2-butyne , trans-2-butene, cis-2-butene.

Ozonolysis of a compound Agathene dicarboxylic acid gives following compounds: On complete reduction by `Na-EtOH`. Agathene dicarboxylic acid give hydrocarbon `C_(20)H_(38)` which have 5 chiral carbon it. Q. How many chiral carbon are present in Agathene dicarboxylic acid:A. `2`B. `3`C. `4`D. `5`

A hydrocarbon of formula `C_(6)H_(12)` decolourises bromine water. It also gives precipatate with ammonical `AgNO_(3)` solution. The hydrocarbon isA. 1,3,5-CyclohexatrieneB. 1,5-HexadiyneC. 2,4-HexadiyneD. None of these

A hydrocarbon A, adds one mole of hydrogen in presence of platinum catalyst to form n-hexane when A is oxidised vigorously with `KMnO_4` , a single carboxylic acid containing three carbon atoms isolated . Give the structure of A and explain.

Benzene on treatment with a mixture of conc. `HNO_(3)` and con. `H_(2)SO_(4)` at 373K givesA. NitrobenzeneB. m-DintrobenzeneC. p-DintrobenzeneD. n-Dinitrobenzene

In the nitration of benzene with conc. `HNO_(3)` and conc `H_(2)SO_(4)` the electrophile acting group isA. `NO_(2)`B. `NO`C. `overset(+)(N)O_(2)`D. `NO_(3)^(-)`

Nitration of benzene is carried out with conc. `HNO_(3)` in presence of conc. `H_(2)SO_(4)`. The role of conc. `H_(2)SO_(4)` is to provideA. nucleophile during the reactionB. free radical during the reactionC. electrophile during the reactionD. catalyst during the reaction

Attacking or reactive or electrophilic species in nitration of benzene is or In the nitration of benzene with concentrated `HNO_(3)` and `H_(2)SO_(4)`, the attck on ring is made by `:`A. `NO_(2)^(-)`B. `NO_(2)^(+)`C. `NO_(3)^(-)`D. `NO_(2)`

Consider the nitration of benzene using mixed conc. `H_(2)SO_(4)` and `HNO_(3)`. If a large amount of `KHSO_(4)` is added to the mixture, the rate of nitration will be `:`A. doubledB. fasterC. slowerD. unchanged

During nitration of benzene withnitrating mixture, `HNO_(3)` acts asA. an acidB. a baseC. catalystD. reducing agent

What is the unit called from which polymers are made?

Addition of water to alkenes in presence of conc. `H_(2)SO_(4)` produces alcohol Which rule is followed in this reaction?

Complete the given reaction of alkene with `KMnO_(4)` in different condition. (i) `CH_(3)-CH_(2)-underset(CH_(3))underset(|)(C)=CH_(2)underset(273K)overset("Alkaline" KMnO_(4))rarr`

The reactioin `CH-=CH+NaNH_(2) to CH-=c^(-)Na^(+)+NH_(3)` shows that the hdyrogen atoms of teminal acteylene areA. AcidicB. BasicC. NeutralD. Amphoteric

Consider the following reaction `RONa+H_(2)C to ROH+NaOH` `ROH+NaNH_(2) to RONa+NH_(3)` Predict which of the following order reagarding base strength is correct.A. `OH^(-)lt NH_(2)^(-) lt RO^(-)`B. `NH_(2)^(-)lt OH^(-) lt RO^(-)C. `OH^(-)lt RO^(-) lt NH_(2)^(-)D. `RO^(-)lt NH_(2)^(-) lt OH^(-)

`CH_3CH_2-CH=CH_2+HBr overset"ROOR"to underset"Major"[X]+underset"Minor"[Y]` [X] and [Y] respectively areA. `BrCH_2CH_2CH=CH_2` and `C_2H_5-CHBr-CH_3`B. `C_2H_5-CH_2CH_2-Br` and `Br-CH_2CH_2-CH=CH_2`C. `C_2H_5-CH_2-CH_2Br` and `C_2H_5-CHBr -CH_3`D. `C_2H_5CHBr-CH_3` and `C_2H_5-CH_2-CH_2Br`

In the alkane, `CH_3CH_2-C(CH_3)_2 -CH_2-CH(CH_3)_2`, identify the `1^@,2^@,3^@` carbon atoms and give the number of H-atoms bonded to each one of these.