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Hydrocarbons Mcq Neet Chemistry
Quiz 4
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Q.1
ion Q91) Identify (B) and (D) in the following sequence of reactions: [Karnataka CET 2011]
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a) CH3OH and C2H5Br
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b) C2H5HSO4 and alc. KOH
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c) C2H5OH and alc. KOH
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d) C2H5HSO4 and aq.KOH
Explanation
Answer:(c)
Q.2
Which of the following is most reactive towards electrophilic substitution reaction? [ J & K CET 2011]
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a) Aniline
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b) Nitrobenzene
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c) Benzoic acid
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d) Acetanilide
Explanation
Aniline is most reactive towards, electrophilic substitution reaction as _NH2 group is activating and strong o- and p- directing group Answer:(a)
Q.3
ion Q93) In the reaction given below, X is ...[ DPMT 2009]>br/>
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a) 2-methylpentane
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b) neo-pentane
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c) 2-methypent-2-ene
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d) 2-methylbut-2-ene
Explanation
Answer:(d)
Q.4
Hydrocarbon which is liquid at room temperature is ...[ AIIMS 2001]
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a) Pentane
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b) Butane
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c) Propane
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d) Ethane
Explanation
Answer:(a)
Q.5
The complete combustion of CH4 gives ...[ BHU 2004]
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a) CO + H2
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b) CO + N2
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c) CO + N2O
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d) CO2 + H2O
Explanation
Answer:(d)
Q.6
Acetylenic hydrogens are acidic because ...[ CBSE PMT 1989]
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a) Sigma electron density of C-H bond in acetylene is nearer to carbon, which has 50% s-character
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b) Acetylene has only one hydrogen on each carbon
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c) Acetylene contains least number of hydrogens among the possible hydrocarbons having two carbons
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d) Acetylene belongs to the class of alkynes with molecular formula. CnH2n-2
Explanation
Answer:(a)
Q.7
ion Q97) In the following compound, the C-2 and C-3 bond is of the type ..[ IIT 1999]
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a) sp-sp2
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b) sp3-sp3
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c) sp-sp3
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d) sp2-sp3
Explanation
According to IUPAC conventions, compound can be umbered as Here C-2 is sp2 and C-3 is sp3 - hybridised Answer:(d)
Q.8
Which of the following metal powder is sued to convert trichloromethane into acetylene by heating the latter with it ? 9Pb CET 1995]
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a) Na
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b) Mg
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c) Ca
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d) Ag
Explanation
CHCl3 +6Ag + CHCl3 → HC≡CH + 6AgCl Answer:(d)
Q.9
Which of the following sequence of reaction (reagents) can be used for the conversion of C6H5CH2CH3 into C6H5-CH = CH2 ? [ AIIMS 2006]
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a) SOCl2; H2O
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b) SO2Cl2; alc. KOH
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c) Cl2/hν; H2O
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d) SOCl2; alc.KOH
Explanation
Answer:(b)
Q.10
The compound which has one isopropyl group is ..[ IIT 1989]
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a) 2, 2, 3. 3-tetramethyl pentane
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b) 2, 2-dimethyl pentane
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c) 2, 2, 3-trimethyl pentane
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d) 2-methyl pentane
Explanation
Answer:(d)
Q.11
Benzene gives mainly ..[ DPMT 2007]
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a) substitution reaction
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b) addition reaction
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c) elimination reaction
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d) all of these
Explanation
Benzene gives mainly substitution reactions like halogenation, nitration and sulphonation etc. Answer:(a)
Q.12
To prepar a pure sample of n-hexane using sodium metal as one reactant, the other reactants will be ...[ CBSE PMT 1992]
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a) Ethyl chloride and n-butyl chloride
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b) Methyl bromide and n- pentyl bromide
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c) n-Propyl bromide
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d) Ethyl bromide and n-.butyl bromide
Explanation
2R-X + 2Na → R=R +2Na+X- Answer:(c)
Q.13
Acid catalysed hydration of alkenes except ethene leads to the formation of ...[ JCECE (Med) 2008]
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a) primary alcohol
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b) secondary or tertiary alcohol
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c) mixture of primary and secondary alcohols
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d) mixture of secondary and tertiary alcohol
Explanation
Answer:(b)
Q.14
hich of the following has the lowestdipole moment? [ IIT 2002]
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a) CH2=CH-C≡CH
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b) CH3C ≡ CCH3
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c) CH2 = CH -C ≡ CH
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d)
Explanation
CH3C ≡ CCH3 is symmetrical have lowestdipole moment Answer:(b)
Q.15
Which of the following liberates methane on treatment with water? [ CMC Vellore 2007]
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a) Silicon carbide
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b) Calcium carbide
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c) Beryllium carbide
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d) Magnesium carbide
Explanation
Be2C + 4H2O → 2Be(OH)2 + CH4 Answer:(c)
Q.16
enzene does not go adition reactions easily because
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a) It has a cyclic structure
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b) Double bonds in it arevery strong
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c) Reasonance stabilized system is to be preserved
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d) It has six hydrogenatoms
Explanation
Answer:(c)
Q.17
-phenyl propene on acidic hydration, gives ..[ IIT 2004]
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a) 2-phenyl-2-propanol
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b) 2-phenyl-1-propanol
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c) 3-phenyl-1-propanol
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d) 1-phenyl-2-propanol
Explanation
Reaction proceeds through carbocation intermediate Answer:(a)
Q.18
The substance that would not at all be formed during the reaction of methane and chlorine in the presence of sunlight is ...
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a) CH3Cl
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b) CHCl3
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c) CH3CH3
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d) CH3CH2CH3
Explanation
Answer:(d)
Q.19
The reaction of sodium formate with soda lime gives
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a) Hydrogen
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b) Methane
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c) Ethane
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d) None of the above
Explanation
Answer:(a)
Q.20
How many chiral compounds are possible on monochlorination of 2-methyl butane? [ IIT 2004]
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a) 2
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b) 4
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c) 6
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d) 8
Explanation
Answer:(b)
Q.21
Among the given compounds, one which can be distinguished by AgNO3 is ? [ AFMC 2010]
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a) Ethane
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b) Ethylene
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c) Acetylene
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d) Diethyl ether
Explanation
Answer:(c)
Q.22
Statement I: 1-butene on reaction with HBr in the presence of peroxide produces 1-bromobutane Statement II: It involves the formation of a primary radical
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a) Statement I is correct Statement II is correct Satement II is a correct explanation of statement I
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b) Statement I is correct statement II is correct statement II is not the correct explanation of statement I
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c) Statement I is correct, statement II is incorrect
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d) Statement I is incorrect statement II is correct
Explanation
CH3 - CH2 - CH = CH2 + Br* → CH3 - CH2 - C*H - CH2Br (secondary free radical) Therefore, statement I is correct but statement II is incorrect Answer:(c)
Q.23
on Q113) Following compound is an ...[ DPMT 2007]
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a) alcoholic KOH
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b) alcoholic KOH followed by NaNH2
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c) aqueous KOH followed by NaNH2
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d) Zn/CH3OH
Explanation
Answer:(b)
Q.24
Which of following will not react with acetylene? [ AIEEE 2002)
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a) NaOH
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b) ammonical AgNO3
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c) Na
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d) HCl
Explanation
Alkalies and nucleophiles normally donot react with acetylene Answer:(a)
Q.25
Which one of the following has the lowest boiling point ... [ PMT Kerala 2011]
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a) 2-Methylbutane
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b) 2-Meyhylpropane
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c) 2,2-Dimethylpropane
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d) n-pentane
Explanation
Answer:(b)
Q.26
Which one of the following will undergo meta-substitution on monochlorination? ...[ AIIMS 1991]
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a) Ethoxybenzne
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b) Chlorobenzene
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c) Ethyl benzoate
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d) Phenol
Explanation
Ester group of Ethyl benzoate (CO2C2H5) is m- directing therefore, monochlorination of ethyl benzoatewill give m- substitution product While othergroups Ethoxy(OC2H5), Chlroro(Cl) and hydroxyl (OH) groups areo-, p- directing Answer:(c)
Q.27
When propyne is treated with aqueous H2SO4 in the presence of HgSO4, the major product is ...[ IIT 1983]
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a) Propanal
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b) propyl hydrogen sulphate
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c) acetone
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d) propanol
Explanation
Alkynes undergo Markownikoff's addition of water in the presence of H2SO4/HgSO4 Answer:(c)
Q.28
When an alyyne, RC≡CH, is treated with cuprous ion in an ammonical medium, one of the products is ...[ DEC 1996]
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a) RC ≡ CCu
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b) CuC ≡ CH
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c) CuC ≡ CCu
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d) RC ≡ CR
Explanation
Answer:(a)
Q.29
Arrange in order of decreasing reactivity towards electrophilic reagent in ; chlorobenzene (I), benzene (II), toluene (III), phenol (IV) would be ...[ AIPMT 2007]
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a) IV > III > II > I
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b) IV > I > II > III
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c) II > I > IV > III
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d) I > II > IV > III
Explanation
The order of decreasing reactivity towards electrophilic reagent is Phenol > Toluene > Benzene > Chlorobenzene As the attack of electrophilic is favoured by electron releasing groups(+I) i.e. -OH > CH3 > H > Cl Answer:(a)
Q.30
han one correct answer Q121) Which one of the following exhibits geometrical isomerism? [ Kerala PMT 2011]
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a) 1, 2-Dibromopropene
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b) 2, 3-Dimethylbut-2-ene
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c) 2,3-Dibromobut-2-ene
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d) 2-Methylbut-2-ene
Explanation
Answer:(a, c)
0 h : 0 m : 1 s
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