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QPID #4779 (SET 1)

CHEMISTRY KCET- DPP 04

Subjective
Class/Batch: KCET Crash Duration: 60 min Date: 03 Apr,2023 Total Mark:60
Your Name: Class: Batch: Course:

About Examination: KCET Crash

CHEMISTRY: Hydrocarbons-Alkenes, Hydrocarbons-Alkynes, HYDROCARBONS,

Section 1    (CHEMISTRY) 60X1=60
1)
#150940
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Question :

Following compound is treated with NBS Compound formed A is

2)
#151213
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Question :

Cyclohexene on reaction with OsO4 followed by reaction with NaHSO3 gives

  1. 𝑐𝑖𝑠 − diol 

  2. 𝑡𝑟𝑎𝑛𝑠 − diol

  3. Epoxy

  4. Alcohol 
3)
#151272
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Question :

Which of the following has highest knocking?

  1. Olefins

  2. Branched chain olefins

  3. Straight chain olefins

  4. Aromatic hydrocarbons
4)
#151363
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Question :

The treatment of 𝑅′ Mg𝑋 with 𝑅C ≡ CH produces

  1. RH

  2. R'H

  3. R - R

  4. R - R'
5)
#151382
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Question :

\(C{H_3} - C \equiv C - C{H_3}\xrightarrow{{Lindlar's\,Catalyst}}\)A the compound 𝐎 is 

  1. 𝑐𝑖𝑠-2-butene 

  2. 𝑡𝑟𝑎𝑛𝑠-2-butene
     

  3. 𝑖𝑠𝑜-butene

  4. 1-butene
6)
#151541
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Question :

Degree of unsaturation in the following compound is

  1. 1°

  2. 2°

  3. 3°

  4. 4°
7)
#157736
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Question :

The correct order for acid strength of compounds \(CH \equiv CH,C{H_3} - C \equiv CH\,and\,C{H_2} = C{H_2}\)

  1. \(CH = CH > C{H_2} = C{H_2} > C{H_3} - C = CH\)

  2. \(HC \equiv CH > C{H_3} - C \equiv CH > C{H_2} = C{H_2}\)

  3. \(C{H_3} - C \equiv CH > C{H_2} = C{H_2} > HC \equiv CH\)

  4. \(C{H_2} - C \equiv CH > CH = CH > CH2 = C{H_2}\)
8)
#160023
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Question :

Propyne and propene can be distinguished by

  1. Conc. H2SO4

  2. Br2 in CCl4

  3. Dil KMnO4

  4. AgNO3 in ammonia
9)
#162334
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Question :

Acetylene and Benzene are distinguished by

  1. H2 / Ni   

  2. Bayer’s reagent

  3. Tollen’s reagent     

  4. either (2) or (3)
10)
#188990
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Question :

Which of following doesnot react with Tollen's reagent?

11)
#190675
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Question :

12)
#191019
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Question :

13)
#191661
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Question :

\(CH \equiv CH\xrightarrow[{\left( {Excess} \right)}]{{Na}}X\xrightarrow[{Excess}]{{{C_2}{H_5}Cl}}'Y'.\) Monochlorination of ‘Y’ [Using UV light] gives____number of isomeric products

  1. 3

  2. 6

  3. 8

  4. 12
14)
#196218
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Question :

Which of the following have maximum heat of hydrogenation :

15)
#2580116
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Question :

Geometrical isomerism is not shown by

  3. CH2 = C(Cl)CH3

  4. CH3 - CH = CH -CH = CH2
16)
#2580118
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Question :

Hex-2-ene and 2-methylpent-2-ene exhibit
 

  1. chain isomerism

  2. position isomerism

  3. geometrical isomerism

  4. optical isomerism
17)
#2580132
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Question :

By which reaction ethene is obtained from ethyne -
 

  1. oxidation

  2. polymerisation

  3. hydrogenation

  4. dehydrogenation
18)
#2580133
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Question :

The major product formed when 2-bromobutane is treated with alcoholic KOH is
 

  1. 2-Butanol

  2. 1-Butene

  3. 1-Butanol

  4. Trans-2-butene
19)
#2580136
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Question :

Ethyl alcohol is heated with conc. H2SO4 . The product formed is :

  2. C2H6

  3. C2H4

  4. C2H2
20)
#2580149
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Question :

Paraffins are soluble in
 

  1. Distilled water

  2. Benzene

  3. Methanol

  4. Sea water
21)
#2580151
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Question :

When hydrochloric acid gas is treated with propene in presence of benzoyl peroxide, it gives

  1. 2-Chloropropane

  2. Allyl chloride

  3. No reaction

  4. n-Propyl chloride.
22)
#2580153
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Question :

When one mole of an alkene on ozonolysis produces 2 moles of propanone, the alkene is
 

  1. 3-methyl-1-butene

  2. 2, 3-dimethyl-1-butene

  3. 2, 3-dimethyl-2-pentene

  4. 2, 3-dimethyl-2-butene
23)
#2580166
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Question :

24)
#2580168
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Question :

Butene-1 may be converted to butane by reaction with
 

  1. Sn – HCl

  2. Zn – Hg

  3. Pd/H2

  4. Zn – HCl
25)
#2580172
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Question :

Alkenes usually show which type of reaction –
 

  1. addition

  2. substitution

  3. elimination

  4. superposition
26)
#2580174
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Question :

A reagent used to test unsaturation in alkene is -
 

  1. ammonical Cu2Cl2

  2. ammonical AgNO3

  3. solution of Br2 in CCl4

  4. conc. H2SO4
27)
#2580178
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Question :

In the given reaction

CH3CH2CH = CHCH3→XCH3CH2COOH +CH3COOH

The X is
 

  1. C2H5ONa

  2. Conc. HCl +Anhy.ZnCl2

  3. Anh. AlCl3

  4. KMnO4/OH–
28)
#2580202
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Question :

The negative part of an addendum adds on to the carbon atom joined to the least number of hydrogen atoms. This statement is called
 

  1. Thiele’s theory

  2. Peroxide effect

  3. Markownikoff’s rule

  4. Baeyer’s strain theory
29)
#2580208
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Question :

Which of the following compounds does not follow Markownikoff’s law ?
 

  1. CH3CH = CH2

  2. CH2CHCl

  3. CH3CH = CHCH3

  4. None of these
30)
#2580215
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Question :

In the following sequence of reactions, the alkene affords the compound ‘B’

The compound B is
 

  1. CH3CH2CHO

  2. CH3COCH3

  3. CH3CH2COCH3

  4. CH3CHO
31)
#2580226
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Question :

Ethylene reacts with alkaline KMnO4 to form
 

  1. Oxalic acid

  2. HCHO

  3. Ethyl alcohol

  4. Glycol
32)
#2580229
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Question :

The reaction of HI with CH3 – CH = CH2 at 400°C yields :
 

  1. CH2 I – CH = CH2

  2. CH3 – CHI – CH3

  3. CH3 – CH2 – CH2 I

  4. CH2I – CH2 – CH2I
33)
#2580255
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Question :

An alkyne has general formula :
 

  1. CnH2n

  2. CnH2n+1

  3. CnH2n+2

  4. CnH2n-2
34)
#2580261
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Question :

Number of alkynes for formula C5H8 is –
 

  1. 2

  2. 3

  3. 4

  4. 5
35)
#2580266
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Question :

The IUPAC name of the compound having the formula CH ≡ C – CH = CH2 is :
 

  1. 1-butyn-3-ene

  2. but-1-yne-3-ene

  3. 1-butene-3-yne

  4. 3-butene-1-yne
36)
#2580276
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Question :

The C - H bond length is minimum in the bond formed by
 

  1. sp - s overlapping (as in alkynes)

  2. sp2 – s overlapping (as in alkenes)

  3. sp3 – s overlapping (as in alkanes)

  4. None of these
37)
#2580284
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Question :

Maximum carbon-carbon bond distance is found in –
 

  1. ethyne

  2. ethene

  3. ethane

  4. benzene
38)
#2580298
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Question :

Butyne-2 contains :
 

  1. sp hybridised carbon atoms only

  2. sp3 hybridised carbon atoms only

  3. both sp and sp2 hybridised carbon atoms

  4. both sp and sp3 hybridised carbon atoms
39)
#2580313
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Question :

The correct order towards bond length is
 

  1. C - C < C = C < C ≡ C

  2. C ≡ C < C = C < C - C

  3. C = C < C ≡ C < C - C

  4. C = C < C - C < C ≡ C
40)
#2580320
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Question :

Which C-atom is the most electronegative in this structure?

 

 

  1. I

  2. II

  3. III

  4. all are equal electronegative
41)
#2580339
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Question :

Calcium carbide when treated with water gives :
 

  1. ethylene

  2. methane

  3. acetylene

  4. ethane
42)
#2580351
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Question :

Which of the following will be the final product when C2H2 reacts with HCl

  4. None of these
43)
#2580354
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Question :

The hydrocarbon which can react with sodium in liquid ammonia is

 

  1. CH3CH2CH2C ≡ CCH2CH2CH3

  2. CH3CH2C ≡ CH

  3. CH3CH = CHCH3

  4. CH3CH2C ≡ CCH2CH3
44)
#2580363
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Question :

When propyne reacts with aqueous H2SO4 in the presence of HgSO4, the major product is
 

  1. Propanal

  2. Propyl hydrogen sulphate

  3. Acetone

  4. Propanol
45)
#2580373
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Question :

What happens when a mixture of acetylene and hydrogen is passed over heated Lindlar’s catalyst ?
 

  1. Ethane and water are formed

  2. Ethylene is formed

  3. Acetylene and ethane are formed

  4. None of these
46)
#2580383
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Question :

Which of the following reaction is shown by alkynes ?
 

  1. Addition

  2. Substitution

  3. Polymerization

  4. All of these
47)
#2580394
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Question :

  1. HBr, Br2, CH3COCH3, CH3CHO

  2. Br2, HBr, CH3COCH3, CH3CHO

  3. HBr, HBr, CH3COCH3, CH3CHO

  4. Br2, HBr, CH3CH2CHO, CH3CHO
48)
#2580403
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Question :

Which of the following catalyst is used for the following conversion ?

 

  1. Platinized Asbestos

  2. Red hot iron tube

  3. Platinized Nickel

  4. Iron-molybdenum
49)
#2580413
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Question :

The ring structure of benzene was proposed by
 

  1. Faraday

  2. Davy

  3. Kekule

  4. Wohler
50)
#2580419
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Question :

The benzene molecule contains
 

  1. 6 sp2 hybrid carbons

  2. 3 sp2 hybrid carbons

  3. 6 sp3 hybrid carbons

  4. 3 sp3 hybrid carbons
51)
#2580431
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Question :

The chemical system that is non-aromatic is

52)
#2580436
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Question :

The product A is
 

  1. Benzene

  2. Benzaldehyde

  3. Toluene

  4. Benzoic acid
53)
#2580445
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Question :

54)
#2580453
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Question :

Catalytic hydrogenation of benzene gives
 

  1. xylene

  2. cyclohexane

  3. benzoic acid

  4. toluene
55)
#2580464
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Question :

The strongest ortho - para and strongest meta - directing groups respectively are
 

  1. –NO2 and –NH2

  2. –CONH2 and –NH2

  3. –NH2 and –CONH2

  4. –NH2 and –NO2
56)
#2580476
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Question :

Benzene can be obtained in the reaction
 

  1. Ethene + 1, 3-butadiene

  2. Trimerisation of ethyne

  3. Reduction of PhCHO

  4. All of these
57)
#2580494
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Question :

Benzene reacts with CH3COCl + AlCl3 to give
 

  1. chlorobenzene

  2. toluene

  3. benzyl chloride

  4. acetophenone
58)
#2580498
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Question :

Benzene on reaction with ozone forms __________.
 

  1. 2 molecules of aldehyde and 1 molecule of ketone

  2. 2 molecules of ketone and 1 molecule of aldehyde

  3. triozonide

  4. hexaozonide
59)
#2580503
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Question :

AlCl3 acts as ________ in Friedel-Crafts reaction
 

  1. nucleophile

  2. electrophile

  3. free radical

  4. intermediate
60)
#2580513
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Question :

During the nitration of benzene. In the process of generation of nitronium ion sulphuric acid behaves as a/an ______ and nitric acid behave as a/an _________.
 

  1. base, acid

  2. acid, base

  3. strong acid, weak acid

  4. weak acid, strong acid
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