tetramethyl butane - neet 2020 preparation | neet exam | … · 2020. 8. 20. · contact info....

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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


The hydrocarbon which is a liquid at room temperature is

(A) Butane

(B) Propane

(C) Decane

(D) Neopentane

02


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


The most volatile alkane is -

(A) n-pentane

(B) isopentane

(C) neopentane

(D) n-hexane

04


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


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


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


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


It is necessary to use ..................... in the iodination of

alkane -

(A) Alcohol

(B) Oxidant

(C) Benzene

(D) Reductant

09


Alkanes are readily attacked by -

(A) Electrophiles

(B) Nucleophiles

(C) Free radicals

(D) Bases

10


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


Which of the following alkane is synthesized from single

alkyl halide by wurtz reaction -

(A) (B)

(C) (D)

12


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


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


The reaction

2CnH2n + 2 + 10O2 6CO2 + 8H2O

is true for the alkane -

(A) Butane (B) Ethane

(C) Propane (D) All of the above

⎯→⎯

15


Toluene is aromatization product of -

(A) n-hexane

(B) n-heptane

(C) n-octane

(D) Iso- octane

16


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


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


Product is -

(A) (B)

(C) (D)

D D

⎯⎯ →⎯/NiH2

D H

D D

H

H

H

D

D

H

H H

19


, 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


Which reagent is used for Clemmensen reduction -

(A) Na–Hg/HCl

(B) Zn–Hg/HCl

(C) SnCl2–HCl

(D) N2H4/KOH

21


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


Which can not be prepared by Kolbe’s electrolytic reaction

using single salt –

(A) CH4

(B) C2H6

(C) C4H10

(D) C3H8

23


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


Product is -

(A) (B)

(C) (D)

AlCl3.HCl

25°C

25


Electrolysis of aqueous solution of CH3COOK gives -

(A) CH4

(B) C2H4

(C) C2H6

(D) C2H2

26


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


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


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


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

30

tetramethyl butane - neet 2020 preparation | neet exam | … · 2020. 8. 20. · contact info....

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