NEET Chemistry Chapter Wise Mock Test – Haloalkanes and Haloarenes

NEET Chemistry Chapter Wise Mock Test – Haloalkanes and Haloarenes

Question 1.
In the following compounds, least number of monochlorination is possible in

Question 2.
Which is the correct increasing order of boiling points of the following compounds?
1-iodobutane, 1-bromobutane, 1-chlorobutane, Butane
(a) Butane< 1-chlorobutane < 1- bromobutane < 1-iodobutane
(b) 1-iodobutane < 1- bromobutane < 1-chlorobutan.e < Butane
(c) Butane < 1-iodobutane < 1- bromobutane < 1-chlorobutane
(d) Butane< 1-chlorobutane < 1-iodobutane < bromobutane

Question 3.
Among the following, the molecule with the highest dipole moment is
(a) CH₃Cl
(b) CH₂Cl₂
(c) CHCl₃
(d) CCl₄

Question 4.
Ethyl chloride on heating with AgCN forms a compound X. The functional isomer of X is
(a) C₂H₅NC
(b) C₂H₅NH₂
(c) C₂H₅CN
(d) None of these

Question 5.
1, 2-dibromoethane reacts with alcoholic KOH to yield a product X. The hybridisation state of the carbons present in X respectively, are
(a) sp,sp
(b) sp³,sp³
(c) sp³,sp²
(d) sp²,sp²

Question 6.
Which one of the following on heating with aqueous KOH, produces acetaldehyde?
(a) CH₃COCl
(b) CH₃CHCl₂
(c) CH₂ClCH₂Cl
(d) CH₃CH₂Cl

Question 7.
Isopropyl bromide in Wurtz reaction gives
(a) hexane
(b) propane .
(c) 2,3-dimethylbutane
(d) neo – hexane

Question 8.
Alkyl halides react reagents with lithium dialkyl cuprate to give
(a) alkenes
(b) alkyl copper halides
(c) alkanes
(d) alkenyl halides

Question 9.

Question 10.
Consider the following reaction.

Which one of the following statements is true for X?
I. It gives propionic acid on hydrolysis.
II. It has an ester functional group.
III. It has a nitrogen linked to ethyl carbon.
IV. It has a cyanide group.
(a) Only IV
(b) Only III
(c) Only II
(d) Only I

Question 11.
When ethyl iodide is heated with dry silver oxide, it forms
(a) ethyl alcohol
(b) diethyl ether
(c) silver ethoxide
(d) ethyl methyl ether

Question 12.
Isopropyl chloride undergoes hydrolysis by
(a) S_N 1 mechanism
(b) S_N 2 mechanism
(c) S_N 1 or S_N 2 mechanism
(d) Neither S_N 1 nor S_N 2 mechanism

Question 13.
Tertiary alkyl halides are practically inert to substitution by S_N 2 mechanism because of
(a) insolubility
(b) instability
(c) inductive effect
(d) steric hindrance

Question 14.
Reaction of C₆H₅CH₂Br with aqueous sodium hydroxide follows
(a) S_N 1 mechanism
(b) S_N 2 mechanism
(c) Any of the above two depending upon the temperature of reaction
(d) Saytzeff rule

Question 15.
In which alkyl halide, S_N2 mechanism is favoured maximum?
(a) CH₃Cl
(b) CH₃CH₂Cl
(c) (CH₃)₂CHCl
(d) (CH₃)₃CCl

Question 16.
Which of the following undergoes nucleophilic substitution exclusively by Sm1 mechanism?
(a) Benzyl chloride
(b) Ethyl chloride
(c) Chlorobenzene
(d) Isopropyl chloride

Question 17.
The order of reactivities of the following alkyl halides for a S_N2 reaction is
(a) RF > RCl > RBr > RI
(b) RCl > RBr >RF >RI
(c) RF > RBr > RCl >RI
(d) RI > RBr > RCl > RF

Question 18.
Among the following compounds, the most reactive towards alcoholic KOH is
(a) CH₂ = CHBr
(b) CH₃COCH₂CH₂Br
(c) CH₃CH₂Br
(d) CH₃CH₂CH₂Br

Question 19.
Which of the following alkyl halides will undergo S_N 1 reaction most readily?
(a) (CH₃)₃C —F
(b) (CH₃)₃C —Cl
(c) (CH₃)₃C —Br
(d) (CH₃)₃C —I

Question 20.
Among the following compounds, which compound undergoes S_N 1 reaction faster?

Question 21.

Question 22.
Aryl halides are less reactive towards nucleophilic substitution reactions as compared to alkyl halides due to
(a) resonance stabilisation
(b) the formation of less stable carbonium ion
(c) larger carbon halogen bond
(d) the inductive effect

Question 23.
p-nitrobromobenzene can be converted to p-nitroaniline by using NaNH₂. The reaction proceeds through the intermediate named
(a) carbocatioa
(b) carbanion
(c) benzyne
(d) dianion

Question 24.

Question 25.
The reaction of toluene with Cl₂ in the presence of FeCl₃ gives predominantly
(a) benzoyl chloride
(b) benzyl chloride
(c) o-and p-chlorotoluene
(d) m-chlorotoluene

Question 26.
o-methoxy bromobenzene is treated with sodamide and then with NH₃. The product formed is
(a) omethoxy bromobenzene
(b) aniline
(c) methoxy benzene
(d) m-methoxy aniline

Question 27.
Replacement of Cl of chlorobenzene to give phenol requires drastic conditions but chlorine of 2,4-dinitrochlorobenzene is readily replaced because
(a) —N0₂ makes electron rich ring at o and p-positions
(b) —N0₂ donate electrons at m-position
(c) —N0₂ withdraws electron at oand p-positions
(d) —N0₂ withdraws electron at m-position

Question 28.
On warming with silver powder, chloroform is converted into
(a) acetylene
(b) hexachioroethane
(c) etnene .
(d) 1,1,2, 2-tetrachloroethane

Question 29.
Which one of the following compound reacts with chlorobenzene to produce DDT?
(a) Acetaldehyde
(b) Nitrobenzene
(c) m-chloroacetaldehyde
(d) Trichloroacetaldehyde

Question 30.
The chemical formula of ‘tear gas’ is
(a) COCl₂
(b) CO₂
(c) Cl₂
(d) CCl₃NO₂

Question 31.
Which of the following is not inflammable?
(a) CHCl₃
(b) Benzene
(c) Toluene
(d) Carbon tetrachloride

Question 32.
Acetone is mixed with bleaching powder to give
(a) chloroform
(b) acetaldehyde
(c) ethanol
(d) phosgene

Question 33.
Iodoform can be prepared from all except
(a) ethyl methyl ketone
(b) isopropyl alcohol
(c) 3-methyl-2-butanone
(d) isobutyl alcohol

Direction (Q.Nos. 34-35): In the following questions more than one answers given may be correct. Select the correct answers and mark it according to the codes.
Codes
(a) 1, 2 and 3 are correct
(b) 1 and 2 are correct
(c) 2 and 4 are correct
(d) 1 and 3 are correct

Question 34.
For the following conversion,
CH₃CH₂CH₂CH₂CL ———–> C₂H₅—C₂H₅
the reagents used, are
1. Mg, dry ether/H₂0
2. LiAlH₄
3. Zn/HCl
4. B₂H₆/THF

Question 35.
The products of alcoholic silver nitrite with ethyl bromide are
1. ethanol
2. nitroethane
3. ethene
4. ethyl nitrite

Question 36.

Direction (Q.NOs. 37-40): Each of these questions contains two statements: Assertion and Reason. Each of these questions also has four alternative choices, only one of which is the correct answer. You have to select one of the codes (a),(b),(c) and (d) given below.
(a) Assertion is True, Reason is True; Reason is the correct explanation for Assertion
(b) Assertion is True, Reason is True; Reason is not the correct explanation for Assertion
(c) Assertion is True, Reason is False
(d) Assertion is False, Reason is correct

Question 37.
Assertion: Chloropropane has higher boiling point than chloroethane.
Reason: Haloalkanes are polar molecules.

Question 38.
Assertion: R Br reacts with AgNO₂ to give R NO₂.
Reason: Boiling point of alkyl iodide is greater than that of alkyl bromide.

Question 39.
Assertion: The presence of nitro group facilitates nucleophilic substitution reactions in aryl halides.
Reason: The intermediate carbanion is stabilised due to the presence of nitro group.

Question 40.
Assertion: Alkyl benzene is not prepared by Friedel-Crafts alkylation of benzene.
Reason: Alkyl halides are less reactive than acyl halides.

Question 41.
Which of the following compounds will undergo racemisation with solution of KOH (hydrolysis)?

(a) (i) and (ii)
(b) (ii) and (iv)
(c) (iii) and (iv)
(d) (i) and (iv)

Question 42.
In the following sequence of reactions,

the end product(C) is
(a) acetone
(b) methane
(c) acetaldehyde
(d) ethyl alcohol

Question 43.

Question 44.
Freon used as refrigerant is
(a) CF₂ = CF₂
(b) CH₂F₂
(c) CCl₂F₂
(d) CF₄

Question 45.
The set of compounds in which the reactivity of halogen atom in the ascending order is
(a) vinyl chloride < chloroethane < chlorobenzene
(b) vinyl chloride < chlorobenzene < chloroethane
(c) chloroethane < chlorobenzene < vinyl chloride
(d) chlorobenzene < vinyl chloride < chloroethane

Question 46.
Haloalkane in the presence of alcoholic KOH undergoes
(a) elimination
(b) polymerisation
(c) dimerisation
(d) substitution

Question 47.
When alkyl halide is heated with dry Ag₂O, it produces
(a) ester
(b) ether
(c) ketone
(d) alcohol

Question 48.
Chemical formula of phosgene is
(a) COCl₂
(b) CaOCl₂
(c) CaCO₃
(d) COCl

Question 49.
If 1, 3-dibromopropane reacts with zinc and Nal, the product obtained is
(a) propene
(b) propane
(c) cyclopropane
(d) hexane

Question 50.
Hydrolysis of trichloromethane with aqueous KOH gives
(a) methanol
(b) acetic acid
(c) ethanol
(d) formic acid

Question 51.
An alkyl chloride (A) on reaction with magnesium in dry ether followed by treatment with ethanol gave 2-methylbutane. Give the possible structure of ‘A’.
(a) (CH₃)₂C(Cl)CH₂CH₃
(b) (CH₃)₂CHCH₂CH₂Cl
(c) CH₃CH₂CH₂CH₂CH₂X
(d) Both (a) and (b)

Answers:

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