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The highest boiling point is expected for :
(A) Isooctane
(B) n–octane
(C) 2,2,3,3 - tetramethyl butane
(D) n-butane
01
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The hydrocarbon which is a liquid at room temperature is
(A) Butane
(B) Propane
(C) Decane
(D) Neopentane
02
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Cyclohexane (C6H12) a hydrocarbon, floats on water
because -
(A) It is immiscible with water
(B) Its density is less than that of water
(C) It is a non-polar substance
(D) It is immiscible and lighter than water
03
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The most volatile alkane is -
(A) n-pentane
(B) isopentane
(C) neopentane
(D) n-hexane
04
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The chlorination of methane to give CH3Cl is an example of -
(A) An addition reaction
(B) An elimination reaction
(C) A reduction reaction
(D) A substitution reaction
05
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A positive reaction of n–butane is possible with the reagent -
(A) F2 in the dark
(B) Cl2 in the dark
(C) Br2 in the dark
(D) Iodine in the dark
06
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Which of the following reaction pairs constitutes the chain propagation step in
chlorination of methyl chloride -
(A) •CH3 + Cl2 → CH3Cl + •Cl
CH3Cl + •Cl → •CH2Cl + HCl
(B) CH3Cl + •Cl → CH2Cl2 + •H
•CH2Cl + Cl2 → CH2Cl2 + •Cl
(C) CH3Cl + •Cl → •CH2Cl + HCl
•CH2Cl + Cl2 → CH2Cl2 + •Cl
(D) •CH2Cl + •CH2Cl → CH2Cl – CH2Cl
•CH2Cl + •Cl → CH2Cl2
07
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In the bromination of the substitution at :
(A) 1º carbon would be fastest
(B) 2ºcarbon would be fastest
(C) 3º carbon would be fastest
(D) 1º , 2º, 3º carbon atoms all will occur at the same rate
08
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It is necessary to use ..................... in the iodination of
alkane -
(A) Alcohol
(B) Oxidant
(C) Benzene
(D) Reductant
09
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Alkanes are readily attacked by -
(A) Electrophiles
(B) Nucleophiles
(C) Free radicals
(D) Bases
10
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Direct iodination of methane is not practicable because -
(A) Iodine–iodine bond is easily broken
(B) HI formed in the reaction reduces CH3I to CH4
(C) CH3I is unstable
(D) is formed with difficulty
CH3
11
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Which of the following alkane is synthesized from single
alkyl halide by wurtz reaction -
(A) (B)
(C) (D)
12
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An alkane containing atleast _____ carbon atoms is
converted into an aromatic hydrocarbon, when heated in
presence of Cr2O3 on Al2O3 -
(A) 6 (B) 4
(C) 3 (D) 5
13
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During the combustion of ethane, the hybrid state of carbon
changes from -
(A) sp2 to sp3
(B) sp3 to sp
(C) sp to sp3
(D) sp2 to sp
14
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The reaction
2CnH2n + 2 + 10O2 6CO2 + 8H2O
is true for the alkane -
(A) Butane (B) Ethane
(C) Propane (D) All of the above
⎯→⎯
15
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Toluene is aromatization product of -
(A) n-hexane
(B) n-heptane
(C) n-octane
(D) Iso- octane
16
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The no. of isomeric carboxylic acid that will be required to
obtain neopentane by soda lime.
(A) 3
(B) 1
(C) 4
(D) 6
17
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Which sodium salt will be heated with sodalime to obtain
propane -
(A) (B)
(C) (D) both 2 & 3
CH3–CH2–C–ONa
O
CH3–CH2–CH2–C–ONa
O
(CH3)2–CH–C–ONa
O
18
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Product is -
(A) (B)
(C) (D)
D D
⎯⎯ →⎯/NiH2
D H
D D
H
H
H
D
D
H
H H
19
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, Major product (A) is -
(A) CH3–CH2–CH2–CH2–CH2–CH3
(B)
(C) CH3CH2–CH2CH3
(D) CH3–CH=CH2
CH3 – CH –CH3 ⎯⎯⎯ →⎯Na/ether
(A) | Cl
CH3 – CH –CH – CH3 | |
CH3 CH3
20
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Which reagent is used for Clemmensen reduction -
(A) Na–Hg/HCl
(B) Zn–Hg/HCl
(C) SnCl2–HCl
(D) N2H4/KOH
21
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A mixture of ethyl iodide and n-propyl iodide is subjected to
Wurtz reaction. The hydrocarbon that will not be formed is-
(A) n–Butane
(B) Propyne
(C) n–Pentane
(D) n–Hexane
22
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Which can not be prepared by Kolbe’s electrolytic reaction
using single salt –
(A) CH4
(B) C2H6
(C) C4H10
(D) C3H8
23
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Indicate the expected structure of the organic product when
ethyl magnesium bromide is treated with heavy water (D2O) -
(A) C2H5–C2H5 (B) C2H5OD
(C) C2H6 (D) C2H5D
24
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Product is -
(A) (B)
(C) (D)
AlCl3.HCl
25°C
25
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Electrolysis of aqueous solution of CH3COOK gives -
(A) CH4
(B) C2H4
(C) C2H6
(D) C2H2
26
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C5H11Cl by Wurtz reaction form 2,2,5,5- tetramethyl hexane
as the main product. Hence, C5H11Cl is -
(A) (B)
(C) (D)
CH3–C–CH2–Cl
CH3
CH3
CH3–C–CH2–CH3
CH3
Cl
CH3–CH–CH–CH3
Cl CH3
CH2–CH–CH2–CH3
Cl CH3
27
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The reactivity of the halogens towards methane decreases in
the order –
(A) F2 > Cl2 > Br2 > I2
(B) I2 > Br2 > Cl2 > F2
(C) F2 > Cl2 > I2 > Br2
(D) Cl2 > F2 > Br2 > I2
28
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An organic compound A(C4H9Cl) on reaction with Na/ether
gives a hydrocarbon which on monochlorination gives only
one chloro derivative then A is -
(A) t-butyl chloride
(B) sec.-butyl chloride
(C) Iso butyl chloride
(D) n-butyl chloride
29
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The bond dissociation energy of the C–H bond for the
compounds
(I) CH3 – H (II) CH3CH2 – H
(III) CH2 = CHCH2 – H (IV) C6H5 – H
decreases in the order -
(A) I > II > III > IV (B) IV > III > II > I
(C) IV > I > II > III (D) II > I > IV > III
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