Contents
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) SN 1 mechanism
(b) SN 2 mechanism
(c) SN 1 or SN 2 mechanism
(d) Neither SN 1 nor SN 2 mechanism
Question 13.
Tertiary alkyl halides are practically inert to substitution by SN 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) SN 1 mechanism
(b) SN 2 mechanism
(c) Any of the above two depending upon the temperature of reaction
(d) Saytzeff rule
Question 15.
In which alkyl halide, SN2 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 SN2 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 SN 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 SN 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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