alkenes€¦ · e-* question no. 03 the general formula of alkenes & cycloalkane will be - (a)...

HYDROCARBONALKENES

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Question No. 01

Propene is more stable than ethene. The reason for this is

the -

(A) Electromeric effect

(B) Hyper conjugation

(C) Inductive effect

(D) Resonance effect

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Question No. 02

The carbon-carbon bond length in the following compounds CH2 = CH2

I II

CH3–CH3 CHCH

III IV

(A) III < II < I < IV (B) IV < I < II < III

(C) I < II < III < IV (D) I < IV < III < II


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Question No. 03

The General formula of alkenes & cycloalkane will be -

(A) CnH2n + 2

(B) CnH2n + 3

(C) CnH2n

(D) CnH2n – 2


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Question No. 04

The reaction is a example of -

CH2=CHCH3+HBr → CH3CHBrCH3

(A) Nucleophilic addition

(B) Electrophilic addition

(C) Electrophilic substitution

(D) Free radical addition


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Question No. 05

The markownikoff's rule is used in connection with -

(A) Stereochemistry of elimination reactions

(B) Stability of free radicals.

(C) Activity of enzymes

(D) Addition of acids to double bonds


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Question No. 07

Ethylene forms ethylene chlorohydrin by the action of -

(A) Dry HCl gas

(B) Dry chlorine gas

(C) Solution of chlorine gas in water

(D) None


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Question No. 08

CH2 = CH2 A (B)

the product (B) is -

(A) Glycol (B) Dial

(C) Dioic acid (D) None of these

⎯⎯ →⎯ 2Cl⎯⎯⎯ →⎯

AgOH


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Question No. 09

The reaction

CH2 = CH2 + Br2 ⎯⎯→ CH2Br – CH2Br

is an example of -

(A) Nucleophilic addition

(B) Electrophilic addition

(C) Elimination

(D) Nucleophilic substitution


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Question No. 10

Olefines can be converted to paraffins by -

(A) Halogenation

(B) Hydrolysis

(C) Hydration

(D) Hydrogenation


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Question No. 11

R-CH=CH2 adds on water in the presence of dilute sulphuric acid or

phosphoric acid to form -

(A) R – CH(OH)–CH3

(B) R – CH2 – CH2OH

(C) R – CHOH – CH2– CH2– CHOH –R

(D) R–CH––CH2 | OH

| OH


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Question No. 12

Alkene 2º alcohol

The alkene would be -

(A) CH3 – CH = CH2 (B) CH3CH2 – CH=CH2

(C) (D) CH3 – CH = CH – CH3

THF

62HB⎯⎯⎯ →⎯

H2O2/ OH

CH3–C=CH2

| CH3


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Question No. 13

Propene, (CH3–CH=CH2) can be converted into 1–propanol by

oxidation. Which set of reagents among the following is ideal to

effect the conversion -

(A) Alkaline KMnO4

(B) B2H6 and alk. H2O2

(C) O3 / zinc dust

(D) OsO4/CHCl3


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Question No. 14

Prilieschaive’s reaction involve -

(A) Epoxidation of alkene

(B) Hydroformylation of alkene

(C) Partial hydrogenation of alkene

(D) Combustion of unsaturated hydrocarbon


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Question No. 15

Two jars A and B are filled with hydrocarbons. Br2 in CCl4 is

added to these jars. A does not decolourise the Br2 solution, but B

decolourises. What are A and B -

(A) Alkane and alkene

(B) Alkene and alkane

(C) Alkene and alkyne

(D) alkyne and alkane


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Question No. 16

Which of the following characteristics apply both to ethene and

ethyne -

(A) Form white precipitate with AgNO3 solution

(B) Explode when mixed with chlorine

(C) Decolourise Baeyer's reagent

(D) Rapidly absorbed by cold conc. H2SO4


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Question No. 17

Ozonolysis of 2-methyl butene-2 yields -

(A) Only aldehyde

(B) Only ketone

(C) Both aldehyde and ketone

(D) Aldehyde or Ketone


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Question No. 18

Which set of products is expected on reductive ozonolysis of the

following diolefin ?

CH3CH =

(A) (B)

(C) (D)

2

3

CHCH–

CH|C =

CH3CHO; CH3–C–CH=CH2 || O

CH3CH=C–CHO; CH2O |

CH3

CH3CHO; CH3–C–CHO; CH2O || O

CH3CHO; CH3–C–CH3; CH2O || O


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Question No. 19

Addition of halogen acid is least in -

(A) CH2 = CHCl

(B) CH2 = CH2

(C) CH3– CH = CH2

(D) (CH3)2C = CH2


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Question No. 20


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Question No. 21

The compound formed when 2-butene is treated with hot alk

KMnO4 is -

(A) CH3–CH=O (B)

(C) CH2OH–CH2OH (D)

CH3–C–OH || O

CH3CH2–C–CH3 || O


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Question No. 22

+ Br2 ⎯⎯→ product (A)

A will have configuration -

(A) (B)

(C) Both true (D) None is true

Br

Br

Br

Br


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Question No. 23

Product is -

(A) Meso diol (B) Racemic diol

(C) Both correct (D) None is correct

OsO4

H3O


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Question No. 24

HCl does not form Anti-Markownikoff’s product with propene,

because -

(A) HCl is a polar covalent molecule

(B) Dipole-Dipole attraction exists between HCl molecules

(C) Formation of Cl• is energetically unfavourable

(D) Chlorine has the highest electron affinity


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Question No. 25

2-methyl propene is isomeric with butene-1. They can be

distinguished by -

(A) Baeyer’s reagent

(B) Ammonical AgNO3

(C) Br2 solution

(D) O3, H2O / Zn


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Question No. 26

Which of the following is the structure of propylene

chlorohydrin -


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Question No. 27

An alkene on oxidation with acidic KMnO4 gives only acetic

acid, what is alkene -

(A) CH3 = CH – CH3

(B) CH3 – CH = CH – CH3

(C) Ethylene

(D) 2-Pentene


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Question No. 28

Which of the following alkenes gives acetaldehyde only on

ozonolysis -

(A) 1-Butene

(B) b-Butylene

(C) Isobutylene

(D) a-Butylene


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Question No. 29

1-Butene on heating with aluminium sulphate at high

temperature ( 200º-300º) isomerises to give -

(A) 2-Butene

(B) Isobutylene

(C) Both the above

(D) Cyclobutane


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Question No. 30

Identify Z in the sequence,


alkenes€¦ · e-* question no. 03 the general formula of alkenes & cycloalkane will be - (a)...

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