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NEET Chemistry MCQ
Haloalkanes And Haloarenes Mcq Neet Chemistry
Quiz 1
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Q.1
Elimination of HBr from 2-bromobutane results in the formation of [AIEEE 2005]
0%
a) equimolar mixture of 1- and 2-butene
0%
b) predominantly 2-butene
0%
c) predominantly 1-butene
0%
d) predominantly 2-butyne
Explanation
Answer:(b)
Q.2
Among the following, the molecule with the highest dipole moment is ...[ IIT 2003]
0%
a) CH3Cl
0%
b) CH2Cl2
0%
c) CHCl3
0%
d) CCl4
Explanation
Answer:(a)
Q.3
Iodoform can be prepared from all except : [ AIEEE 2012]
0%
a) isopropyl alcohol
0%
b) 3-methyl-2-butanone
0%
c) isobutyl alcohol
0%
d) ethyl methyl ketone
Explanation
Answer:(c)
Q.4
Elimination reaction of 2-Bromo-pentane to form pent-2-ene is (a) β-Elimination reaction (b) Follows Zaitsev rule (c) Dehydrohalogenation reaction (d) Dehydration reaction .... [ NEET 2020]
0%
a) (b), (c), (d)
0%
b) (a), (b), (d)
0%
c) (a), (b), (c)
0%
d) (a), (c), (d)
Explanation
Answer:(c)
Q.5
The reaction of C6H5CH = CHCH3 with HBr produces ... [ AIPMT 2015
0%
a)
0%
b)
0%
c) C6H5CH2CH2CH2Br
0%
d)
Explanation
Answer:(a)
Q.6
Which of the following reaction(s) can be used for the preparation of alkyl halides? [ AIPMT 2015] I. CH3CH2OH + HCl ( in presence of anh ZnCl2) → II.CH3CH2OH + HCl → III. (CH3)3COH + HCl → IV. (CH3)2CHOH + HCl ( in presence of anh ZnCl2) →
0%
a) I, III and IV
0%
b) I and II
0%
c) Only IV
0%
d) III and IV
Explanation
Answer:(a)
Q.7
In the following sequence of reactions, the end product C is .... [ AIPMT 2012]
0%
a) acetone
0%
b) methane
0%
c) acetaldehyde
0%
d) ethyl alcohol
Explanation
Answer:(d)
Q.8
In a SN2 substitution reaction of the type Which one of the following has the highest relative rate? [ AIPMT 2008]
0%
a) CH3CH2CH2Br
0%
b) CH3CH2Br
0%
c)
0%
d)
Explanation
Answer:(b)
Q.9
Non-sticking frying pans are coated with ... [ ISM 1993]
0%
a) ethylene
0%
b) styrene
0%
c) tetrafluoroethylene (Teflon)
0%
d) chlorofluoro methane
Explanation
Answer:(c)
Q.10
The -OH group of an alcohol or the -COOH group of a carboxylic acid can ne replaced by -Cl using ...[ AIPMT 2004]
0%
a) phosphorous pentachloride
0%
b) hypochlorous acid
0%
c) chlorine
0%
d) hydrochloric acid
Explanation
Answer:(a)
Q.11
Which of the following is responsible for depletion of the ozone layer in the upper strata of the atmosphere? [ AIPMT 2004]
0%
a) polyhalogens
0%
b) Ferrocenes
0%
c) Fullerens
0%
d) Freons
Explanation
Answer:(d)
Q.12
Reactivity order of halides for dehydrohalogenation is ...[ AIPMT 2002]
0%
a) R-F > R - Cl > R - Br > R - I
0%
b) R - I > R - Br > R - Cl > R - F
0%
c) R - I > R - Cl > R - Br > R - F
0%
d) R - F > R - I > R - Br > R - Cl
Explanation
Answer:(b)
Q.13
An organic compound A[C4H9Cl] on reaction with Na/diethyl ether gives a hydrocarbon which on monochlorination gives a hydrocarbon which on monochlorination gives only one chloro derivative, then A is [AIPMT 2001]
0%
a) t-butyl chloride
0%
b) s-butyl chloride
0%
c) iso- butyl chloride
0%
d) n- butyl chloride
Explanation
Answer:(a)
Q.14
Gammexane is [ AIPMT 1999]
0%
a) chlorobenzene
0%
b) benzyl chloride
0%
c) bromobenzene
0%
d) benzene hexachloride
Explanation
Answer:(d)
Q.15
(CH3)3CMgCl on reaction with D2O gives ...[ IIT 1997]
0%
a) (CH3)3CD
0%
b) (CH3)3OD
0%
c) (CD3)3CD
0%
d) (CD3)3OD
Explanation
Answer:(a)
Q.16
2-bromopentane is heated with potassium ethoxide in ethanol. the major prodct obtained is ...[ AIPMT 1998]
0%
a) 1-ethoxypentane
0%
b) pentene-1
0%
c) trans - pentene - 2
0%
d) cis-pentene-2
Explanation
Answer:(c)
Q.17
The alkyl halide is converted into an alcohol by ... [ AIPMT 1997]
0%
a) addition
0%
b) substitution
0%
c) dehydrohalogenation
0%
d) elimination
Explanation
Answer:(b)
Q.18
When chlorine is passed through propene at 400°C, which of the following is formed? [ AIPMT 1993]
0%
a) PVC
0%
b) Allyl chloride
0%
c) Nickel chloride
0%
d) 1, 2-dichloro ethane
Explanation
Answer:(b)
Q.19
Industrial preparation of chloroform employs acetone and ... [AIPMT 1993]
0%
a) phosgene
0%
b) clacium hypochlorite
0%
c) chlorine gas
0%
d) sodium chloride
Explanation
Answer:(b)
Q.20
When hydrochloric acid gas is treated with propene in presence of benzoyl peroxide, it gives ... [ AIPMT 1993]
0%
a) 2-chloropropane
0%
b) alkyl chloride
0%
c) no reaction
0%
d) n- propyl chloride
Explanation
Answer:(a)
Q.21
Chlorobenzne reacts with Mg in dry ether to give a compound [A] which further reacts with ethanol to yiled .... [ AIPMT 1993]
0%
a) phenol
0%
b) benzene
0%
c) ethyl benzene
0%
d) phenyl ether
Explanation
Answer:(b)
Q.22
In compound 'X' all the bond angles are exactly 109°28', 'X' is ... [ AIPMT 1991]
0%
a) Chloromethane
0%
b) Carbon tetrachloride
0%
c) Iodoform
0%
d) Chloroform
Explanation
Answer:(b)
Q.23
The Cl- C - Cl angle in 1,1,2,2-tetra-chloroethane and tetrachloromethae will be about ...[ AIPMT 1988]
0%
a) 120° and 109°28'
0%
b) 90° and 109.5°
0%
c) 109.5° and 90°
0%
d) 109.5° and 120°
Explanation
Answer:(a)
Q.24
What products are formed when the following compound is treated with Br2 in the presence of FeBr3? [ AIPMT 2014]
0%
a)
0%
b)
0%
c)
0%
d)
Explanation
Answer:(b)
Q.25
Fires result from the combustion of alkali metals can be extinguished by ... [ KCET 1994]
0%
a) CCl4, ,
0%
b) sand
0%
c) water
0%
d) kerosene
Explanation
Answer:(a)
Q.26
Identify the set of reagents/reaction conditions 'X' and 'Y' in the following set of transformations: [IIT 2002]
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a) X = dilute NaOH aq: 20°C Y = HBr/acetic acid: 20°C
0%
b) X = conc. alc. NaOH; 80°C Y = HBr/ acetic acid; 20°C
0%
c) X = dilute aqueous NaoH; 20°C Y = Br2/CHCl3; 0°C
0%
d) X = conc. alc. NaoH; 80°C Y = Br2/CHCl3; 0°C
Explanation
Answer:(b)
Q.27
Which of the following undergoes nucleophilic substitution exclusively by SN1 mechanism? [ AIPMT 2005]
0%
a) Benzyl chloride
0%
b) Ethyl chloride
0%
c) Chlorobenzene
0%
d) Isopropyl chloride
Explanation
Answer:(a)
Q.28
If chloroform left open in air in presence of sun-rays ... [ MLNR 1994]
0%
c) polymerization takes place
0%
a) explosion takes place
0%
b) poisonous phosgene gas is formed
0%
d) no reaction takes place
Explanation
Answer:(d)
Q.29
Which is finally produced when acetylene reacts with HCl ...
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a) CH2 = CHCl
0%
b) CH3CHCl2
0%
c) ClCH=CHCl
0%
d) None of these
Explanation
Answer:(b)
Q.30
Phenol is heated with CHCl3 and alcoholic KOH when salicylaldehyde is produced. The reaction is known as
0%
a) Rosenmund's reaction
0%
b) Reimer Tiemann reaction
0%
c)
0%
d)
Explanation
Answer:(b)
0 h : 0 m : 1 s
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