Halogen Derivatives Of Alkanes And Arenes NEET JEE MHTCET Practice Question for Students.

1)  The order of reactivity in nucleophilic substitution reaction is

a) CH₃F < CH₃CI <CH₃I  < CH₃Br

b) CH₃F < CH₃CI < CH₃Br < CH₃I

c) CH₃F < CH₃Br < CH₃Cl < CH₃I

d) CH₃I < CH₃Br < CH₃CI < CH₃F

2) Racemate is

a) Optically active    b) optically dextro rotatory

c) Optically inactive d) optically laevorotatory

3) The number of asymmetric carbon atoms in glucose are

a) 2               b) 3                c) 4                d) 5

4) The geometry of carbonium ion is

a) Tetrahedral            b) planar

c) linear                                      d) pyramidal

5) In its nucleophilic substitution reaction, aryl halide

resembles

a) Vinyl chloride        b) allyl chloride

c) Benzyl chloride       d) ethyl chloride

6) Which alkyl halide among the following compounds

has the highest boiling point?

a) (CH₃)₃ CCl                b) CH₃CH₂CH₂CH₂Cl

c) CH₃CH₂CH₂Cl                d) CH₃CH (CH₃) CH₂Cl

7) It is difficult to break C-Cl bond in CH₂ = CH-Cl due to

a) Hyper conjugation     b) Resonance

c) Electromeric effect   d) Inductive, effect

8) The most reactive alkyl halide towards SN² reaction is

a) CH₃X                             b) R₃CX

c) R₂CHX                      d) RCH₂X

9) The number of electrons surrounding the carbonium ion is

a) 6      b) 8      c) 10    d) 7

10) The optically inactive compound is

a) Glucose                     b) Lactic acid

c) 2-Chlorobutane       d) 2-Chloro propane

11) The hydrogen halide which does not obey

Markownikoff's rule in presence of a peroxide is

a) HCl       b)HBr      c) HF       d) HI

12) How many optically inactive isomers are possible For C₅H₁₁Cl?

a) 2             b) 3        c) 4             d) 8

13) Which one of the following is NOT used to prepare alkyl halide from an alcohol?

a) SOCl₂                           b)PCl₃

c) HCl + ZnCl₂  d)NaCl

14) The total number of electrons present in the central carbon atom of a free radical is

a) 7          b) 8          c) 9           d)6

15) In which of the following pairs both are nucleophiles?

a) BF₃,AlCl₃      b)NO⁺₂, Cl^-

c) CN^-, NH₃      d) Br⁺, BCl₃

16) Which one of the following alkane is NOT formed in Wurtz reaction?

a) Methane    b) ethane

c) propane       d) butane

17) According to R, S convention, which of the following groups has highest priority ?

a) CH₂OH         b) COOH

c) COCH₃         d) COOCH₃

18) Iodoform is used as

a) an anaesthetic          b) an antiseptic

c) an analgesic              d) an antibiotics

19) But-1-ene on reaction with HCl in the presence of sodium peroxide yields

(a) n-butyl chloride                    (b) isobutyl chloride

(c) secondary butyl chloride  (d) tertiary butyl chloride

20) Carbon atom in ethyl carbocation contains how many pairs of electrons?  

a) 8            b) 4             c) 3           d) 5

21) The preparation of alkyl fluoride from alkyl chloride, in the presence of  

metallic fluorides is known as

(a) Williamson’s reaction

(b) Finkelstein reaction

(c) Swarts reaction

(d) Wurtz reaction

22) The stability order for carbocation is

(a) 2°˃3°˃1°   (b) 3°˃2°˃1°˃   (c) 3°˃1°˃2°˃  (d) 1°˃3°˃2°˃