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Hydrocarbons Mcq Neet Chemistry
Quiz 5
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Q.1
The reagent used for following conversion is CH3CH2COOH → CH3CH2CH3 ...[DEC 1994]
0%
a) LiAlH4
0%
b) Soda Lime
0%
c) Red P and concentrated HI
0%
d) Amalgamated zinc and concnetrated HCl
Explanation
Answer:(c)
Q.2
The only alcohol that can be prepared by the indirect hydration of alkene us ...[ AFMC 2005]
0%
a) ethyl alcohol
0%
b) propyl alcohol
0%
c) isobutyl alcohol
0%
d) methyl alcohol
Explanation
Ethyl alcohol is the only alcohol is the only alcohol that can be prepared by the indirect hydration of alkene Answer:(a)
Q.3
Bayer's reagent is ... [ BHU ]
0%
a) Saturated KMnO4 solution
0%
b) Neutral KMnO4 solution
0%
c) Alkaline KMnO4 solution
0%
d) Acidic KMnO4 solution
Explanation
Answer:(c)
Q.4
The compound which do not have any primary hydrogen atoms is ... [ AIIMS 2004]
0%
a) butane
0%
b) iso-butane
0%
c) cyclohexane
0%
d) 2,3-dimenthylbutane
Explanation
Primary Hydrogen = a hydrogen on a carbon, attached to only ONE other carbon Secondary hydrogen = a hydrogen on a carbon, attached to only TWO other carbons Tertiary hydrogen = a hydrogen on a carbon attached to THREE other carbons In case of cyclohexane each carbon is ttached to two carbon atoms Answer:(c)
Q.5
Which of the following reacts fastest with Br2 + anhyd.AlCl3?
0%
a) Anisole
0%
b) Toluene
0%
c) Benzene
0%
d) Nitrobenzene
Explanation
CH3O- group in anisol is a much stronger electron-donating group than CH3 group in toluene. Nitro group in nitrobenzne is a electron withdrawing group. Thus electron density is maximum in anisol and hence reacts fastest with Br2 + anhyd.AlCl3 Answer:(a)
Q.6
Pheyl magnesium bromide reacts with methanol to give ...[ DPMT 2009]
0%
a) a mixture of anisole and Mg(OH)Br
0%
b) a mixture of benzene and Mg(OMe)Br
0%
c) a mixture of toluene and Mg(OH)Br
0%
d) a mixture of phenol and Mg(Me)Br
Explanation
C6H5 - MgBr + CH3OH + CH3OH → C6H6 + Mg(OCH3)Br Answer:(b)
Q.7
StatementI:Dimethyl sulphide is commonly used for the reduction of an ozonide of an alkene to get the carbonyl compound Statement II: It reduces the ozonide giving water soluble dimethyl sulphoxide and excess of it evaporates ...[ IIT 2001]
0%
a) Statement I is correct Statement II is correct Satement II is a correct explanation of statement I
0%
b) Statement I is correct statement II is correct statement II is not the correct explanation of statement I
0%
c) Statement I is correct, statement II is incorrect
0%
d) Statement I is incorrect statement II is correct
Explanation
Both statements are correct and Statement II is correct explanation of statement I Answer:(a)
Q.8
The compound with molecular formula C8H10 which will give only two isomers on electrophilic substitution with Cl2/FeCl3 or with HNO3/H2SO4 is ..[ DUMET 2010]
0%
a) p-dimethylbenzene
0%
b) m-dimethylbenzene
0%
c) o-dimethylbenzene
0%
d) ethylbenzene
Explanation
Answer:(c)
Q.9
In which reaction, polysubstitution takes place? [AMU 2006]
0%
a)
0%
b)
0%
c)
0%
d)
Explanation
Answer:(b)
Q.10
The major organic compound formed by the reaction of 1,1,1-trichloroethane with silver powder is ...[ IIT 2014]
0%
a) acetylene
0%
b) ethene
0%
c) 2-butyne
0%
d) 2-butene
Explanation
The reaction is Answer:(c)
Q.11
When one mole of an alkene on ozonolysis produces 2 moles of propanone the alkene is ...[ Kerala PMT 2011]
0%
a) 2,3-dimethyl-1-butene
0%
b) 2,3-dimethyl-2-pentene
0%
c) 2,3-dimethyl-2-butene
0%
d) 3-methyl-1-butene
Explanation
Answer:(c)
Q.12
Formation of alkanes by action of Zn on alkyl halides is called ... [ DPMT 1994]
0%
a) Frankland reaction
0%
b) Cannizzaro reaction
0%
c) Wurtz ereaction
0%
d) Kolbe's reaction
Explanation
When Zn is used in Wurtz reaction in place of Na, the reaction is named as Frankland method. Answer:(a)
Q.13
on Q133) In this reaction, the final product (C) is ... [ DPMT 2005]
0%
a) CH3CH(Br)CH3
0%
b) CH3CH2CH2Br
0%
c) CH2 = CHBr
0%
d) BrHC=CH-CH3
Explanation
(C) is 2-Bromopropane Answer:(a)
Q.14
on Q134) Among the following compound (I - III), the correct order in reaction with electrophile is ...[ CBSE 1997]
0%
a) II > III > I
0%
b) III < I < II
0%
c) I >II > III
0%
d) I = II > III
Explanation
OCH3 is strong electron donating group While NO2 is electron wwithdrawing group Therefore the order of reactivity of thse three compund with electrophile decreases I > II > III Answer:(c)
Q.15
Which of the following yields both alkane and alkene? [ AFMC 2004]
0%
a) Kolbe's reaction
0%
b) Williamson's synthesis
0%
c) Wurtz reaction
0%
d) Sandmeyer's reaction
Explanation
Kolbe's method:Electrolysis of a concentrated aqueous solution of either sodium or pottassium salts of saturated monocarboxylic acids yield higher alkanes at anode when sodium or pottassium salts of saturated dicarboxylic acids of succinic acid type are subjected to electrolysis in aqueous solution,alkenes are formed. Answer:(a)
Q.16
Olefins can be hydrogenated by .... [ AIIMS 1991]
0%
a) Zinc and hydrochloric acid
0%
b) Raney nickel and hydrogen
0%
c) Nascent hydrogen
0%
d) Lithium aluminium hydride in ether
Explanation
Answer:(b)
Q.17
Identify a reagent from the following list which can easily distingusih between 1-butyne and 2-butyne [ IIT 2002 ]
0%
a) bromine, CCl4
0%
b) H2, Lindlar catalyst
0%
c) dilute H2SO4, HgSO4
0%
d) ammonical CuCl2Solution
Explanation
Ammonical CuCl2 forms red precipitate with termical alkynes, can be used to distinguish terminal alkynes from internal alkynes Answer:(d)
Q.18
n-butylbenzene on oxidation will give [kerala MEE 2000 ]
0%
a) benzoic acid
0%
b) butanoic acid
0%
c) benzyl alcohol
0%
d) benzaldehyde
Explanation
Answer:(a)
Q.19
The strongest ortho-para and strongest meta-directing group respectively are ...[ Kerala PMT 2006]
0%
a) - NO2 and -NH2
0%
b) -COCNH2 and -NH2
0%
c) -NH2 and -CONH2
0%
d) -X and -CONH2
Explanation
The -NH2 group is strongest o - p directing group and -NO2 is strongest m- directing group Answer:(c)
Q.20
The compound with highest boiling point is ...[ IIT 1982]
0%
a) 2-methyl butane
0%
b) n-pentane
0%
c) 2,2-dimethyl propane
0%
d) n-hexane
Explanation
Among alkanes, boiling point increases with molar mass. Among isomeric alkanes, branching decrases boiling point. Therefore, n-hexane has highest boiling point among these Answer:(d)
Q.21
Which of the following has lowest boiling point? [ AFMC 2009]
0%
a) CH3CH2CH=CHCH3
0%
b) CH3CH2CH2CH2CH3
0%
c) H2C = CH - CH2CH = CH2
0%
d)
Explanation
Due to the fact that branching of the chain makes the molecule more compact and thereby decreases the surface area. Therefore, the intermolecular attractive forces which depend upon the surface area, also become small in magnitude on account of branching. Consequently, the boiling points of the branched chain alkanes are less than the straight chain isomers. Answer:(d)
Q.22
Coal-tar is a main source of .... [ JIPMER 1994]
0%
a) Aromatic compounds
0%
b) Aliphatic compounds
0%
c) Cycloalkanes
0%
d) Heterocyclic compounds
Explanation
Answer:(a)
Q.23
3-phenyl propene on reaction with HBr gives (as a major product) [ AIIMS 2005]
0%
a) C6H5CH2CH(Br)CH3
0%
b) C6H5CH(Br)CH2CH3
0%
c) C6H5CH2CH2CH2Br
0%
d) C6H5CH(Br)CH=CH2
Explanation
Answer:(b)
Q.24
What is formed when acetylene reacts with hypochlorous acids? [ AIEEE2002]
0%
a) CH3COCl
0%
b) ClCH2CHO
0%
c) Cl2CHCHO
0%
d) ClCH2COOH
Explanation
HC ≡CH +2HOCl → [ CHCl2 -CH(OH)2] → CHCl2-CHO + H2O produces dichloroacetaldehyde Answer:(c)
Q.25
Which of the following is not a green house gas ..[ CET (J&K) 2011]
0%
a) Nitrogen
0%
b) Carbondioxide
0%
c) Ozone
0%
d) Methane
Explanation
Answer:(a)
Q.26
The presence of unsaturation in organic compounds can be tested with
0%
a) Fehling's solution
0%
b) Tollen's reagent
0%
c) Schiff's reagent
0%
d) Bayers reagent
Explanation
Fehling's solution detect presence of aldehydes Tollen's reagent detect presence of aldehyde, aromatic aldehyde and alpha-hydroxy ketone functional groups Schiff's reagent used for detection of many organic aldehydes that has also found use in the staining of biological tissues Bayers reagenttest for the presence of unsaturation Answer:(d)
Q.27
on Q147) Passage Based Question Q147A) Compound X is
0%
a)
0%
b)
0%
c)
0%
d)
Explanation
Hydroboration oxidation brings about anti-Markonikoff's hydration of alkene Answer:(c )
Q.28
Which of the following alkenes will react faster with H2 under catalytic hydrogenation condition R is alkyl substituent
0%
a)
0%
b)
0%
c)
0%
d)
Explanation
Steric hindranceis minimumin RHC = CHR Answer:(d)
Q.29
Most reactive compound towards electrophilic substitution is ...[ DPMT 2008]
0%
a)
0%
b)
0%
c)
0%
d) none of these
Explanation
Answer:(a)
Q.30
The C-H bond distance is the longest in ..[ IIT 1989]
0%
a) C2H2
0%
b) C2H4
0%
c) C2H6
0%
d) C2H5Br2
Explanation
Answer:(c)
0 h : 0 m : 1 s
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