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NEET Chemistry MCQ
Hydrocarbons Mcq Neet Chemistry
Quiz 6
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Q.1
on Q151) 'A" predominantly in following reaction is [ AIPMT 2008]
0%
a)
0%
b)
0%
c)
0%
d)
Explanation
Answer:(d)
Q.2
Fischer-Trops process is used in the manufacture of ... [ AFMC 1994]
0%
a) Synthetic petroleum
0%
b) Ethanol
0%
c) Benzene
0%
d) Ethanoic acid
Explanation
Answer:(a)
Q.3
on Q153) Identify the product (Y) in the following reaction sequence : [ CET Karnataka 2006]
0%
a) cyclobutane
0%
b) cyclopentane
0%
c) pentane
0%
d) cyclopentanone
Explanation
Answer:(b)
Q.4
Which of the following has dipole moment?
0%
a) trans-2-butene
0%
b) 1-propene
0%
c) cis-2-butene
0%
d) Both a and b
Explanation
Answer:(d)
Q.5
Which of the following has highest knocking property? AFMC 2007]
0%
a) Aromatic hydrocarbons
0%
b) Olefins
0%
c) Branched chain paraffins
0%
d) Stright chain parafiins
Explanation
Straight chain paraffins has highest knocking property Answer:(d)
Q.6
Addition of one equivalent of Br2 to 1,3-pentadiene produces ...
0%
a) 4,5-Dibromo-2-pentene
0%
b) 1,4-Dibromo-2-pentene
0%
c) 3,4 - Dibromopentene
0%
d) 3,4-Dibromo -2-pentene
Explanation
there is cyclic delocalization of pi- electrons Answer:(b)
Q.7
arbons gneetStudy Companion For more NEET and AIIMS mcq on Hydrocarbons Q157) Baeyer's reacgent is ... [ IIT 1984
0%
a) alkaline permanganate solution
0%
b) acidified permaganate solution
0%
c) neutral permaganet solution
0%
d) aqueous bromine solution
Explanation
Baeyer's reagent is cold, dilute, alkaline permanganate solution, used to detect presence of olefine bonds Answer:(a)
Q.8
Which of the following compounds will exhibit geometrical isomerism? [ IIT 2015 Mains]
0%
a) 1-phenyl-2-butene
0%
b) 3-phenyl-1-butene
0%
c) 2-phenyl-1-butene
0%
d) 1, 1-diphenyl-1-propane
Explanation
Answer:(a)
Q.9
Meta-directing and deactivating group in aromatic electrophilic substitution is ...[ Kerala PMT 2012]
0%
a) - NO2
0%
b) - OH
0%
c) - Cl
0%
d) -CH3
Explanation
The - NO2 group is electron withdrawing and it decreases the electron density in the aromatic ring and hence is m-directing and deactivating Answer:(a)
Q.10
When an alkyl iodide is treated with Na in dry ether,a symmetrical alkane ()R2) is obtained. the reaction is called ... [ DEC 1994]
0%
a) Grignard reaction
0%
b) Fischer-Tropsch reaction
0%
c) Berguis reaction
0%
d) Wurtz reaction
Explanation
Answer:(d)
Q.11
When C2H2, CH4 and C2H4 passes through a test tube which have ammoniacal Cu2Cl2, find out which gas comes out unaffected from test tube? [ BCECE 2008]
0%
a) C2H2 and CH4
0%
b) C2H2 and C2H4
0%
c) C2H2
0%
d) C2H4 and CH4
Explanation
When C2H2, CH4 and C2H4 passes through ammoniacal Cu2Cl2 solution, then only C2H2 (acetylene) gives a red precipitate of cuprous acetylide (CuC≡C-Cu) nad the unaffected gases which comes out are C2H4 and CH4 Answer:(d)
Q.12
Benzene on treatment with amxiture of conc. HNO3 and conc.H2SO4 at 100°C gives ..[ JIPMER 1994]
0%
a) Nitrobenzne
0%
b) m-dinitrobenzne
0%
c) p- dinitrobenzne
0%
d) o-dinitrobenzne
Explanation
At about 60°C, mononitration occurs but at 100°C, dinitration occurs. Since -NO2 is m-directing, therefore, m- dinitrobenzne is formed at 100°C Answer:(b)
Q.13
Which compound can not be formed from Wurtz reaction? [ CPMT 2010]
0%
a) propane
0%
b) ethane
0%
c) butane
0%
d) methane
Explanation
Methane cannot be formed from Wurtz reaction Answer:(d)
Q.14
Which one of the following is not an aromatic? [ J &K CET 2011]
0%
a) Cyclopentadienyl anion
0%
b) Cycloheptatrienyl cation
0%
c) Thiophene
0%
d) Cyclooctatetraene
Explanation
Cyclooctatetraene does not obey Huckel rule and hence is not aromatic Answer:(d)
Q.15
on Q167) Thr principal; organic product formed in the reaction
0%
a) CH3CHNr(CH2)8COOH
0%
b) CH2 = CH(CH2)8COBr
0%
c) CH2BrCH2(CH2)8COOH
0%
d) CH2=CH(CH2)7CHBrCOOH
Explanation
In presence of peroxide , the addition of HBr follows anti-Markovnikov's rule option'c' correct Answer:(c)
Q.16
Position of double bond in alkenes can be identified by .. [ DEC 2001]
0%
a) Bromine water
0%
b) Ammonical silver nitrate solution
0%
c) Ozonolysis
0%
d) None of these
Explanation
Answer:(c)
Q.17
on Q169) Among the following compounds, the decreasing order of reactivity towards electrophilic substitution is ...[ AIPMT 2001]
0%
a) III > I > II > IV
0%
b) IV > I > II > III
0%
c) I > II > III > IV
0%
d) II > I > III > IV
Explanation
Structure III is most reactive because -OCH3 grop is strongely activating due to release of electrons towards benzene ring through resonance Answer:(a)
Q.18
on The reagent(s) for the following conversion is/are ...[ IIT 2007]
0%
a) alcoholic KOH
0%
b) alcoholic KOH followed by NaNH2
0%
c) aqueous KOH followed by NaNH2
0%
d) Zn/CH3OH
Explanation
Answer:(b)
Q.19
Name the reagent used to bring about the following transformation; but-2-ene to ethanal... [ AMU 2010]
0%
a) K2Cr2O7 in acidic medium
0%
b) CrO2Cl2/H3O+
0%
c) PCC
0%
d) O3/H2O-Zn dust
Explanation
Answer:(d)
Q.20
R-CH2 - CCl2-R + A → R-C ≡C - R. Reagent A is .. [ CBSE PMT 1989]
0%
a) Na
0%
b) HCl + H2O
0%
c) KOH in C2H5OH
0%
d) Zn in alcohol
Explanation
Alcoholic KOH specially in ethylene alcohol, produce C2H5O-. These ions are stronger than OH- ion. Thus they reacts with β hydrogen of alkyl halid to produce alkene. This is elemination reaction R-CH2 - CCl2-R + KOH(Alco.) → R-C ≡C - R. Answer:(c)
Q.21
Which one of the following alkenes will react faster with H2 under catalytic hydrogenation condition? [ AIPMT 2005]
0%
a)
0%
b)
0%
c)
0%
d)
Explanation
According to Saytzeff's rule, the order of stability of alkene is in order Answer:(a)
Q.22
Two organic compounds A and B both containing only carbon and hydrogen,on quantitive analysis gave the same percentage composition by weight C =(12/13)×100%, H = (1/13)×100% A decolourises brominewater but B does not. A and B respectively are
0%
a) C2H2 and C6H6
0%
b) C6H6 and C2H2
0%
c) C2H4 and C2H6
0%
d) C2H2 and C2H6
Explanation
Benzene do not decolourisesbromine water Fromthe weight data ratio of C:H is 1:1 Hence A is C2H2 Answer:(a)
Q.23
Which of the following lowest octane number? [ CMC 2007]
0%
a) n-Hexadecane
0%
b) iso-Octane
0%
c) n-Hexane
0%
d) n-Heptane
Explanation
Answer:(a)
Q.24
Reduction of 2-butyne with sodium inliquid ammonia gives predominantly ..[ CBSE PMT 1993]
0%
a) cis--Butene
0%
b) No reaction
0%
c) trans-2-Butene
0%
d) n-butane
Explanation
Answer:(c)
Q.25
In the following reaction , the major product is [AIPMT 2012]
0%
a)
0%
b)
0%
c)
0%
d)
Explanation
Answer:(b)
Q.26
The function of AlCl3 in the Friedal-Crafts reaction is ...[Haryana CEET 1998]
0%
a) to absorb water
0%
b) to absorb HCl
0%
c) to produce electrophile
0%
d) to produce nucleophile
Explanation
Answer:(c)
Q.27
Both methane and ethane can be prepared in one stape from
0%
a) CH3CH2I
0%
b) CH3Br
0%
c) C2H5OH
0%
d) CH3OH
Explanation
CH3Br on reduction withZn-Cu coupleand ethanol gives CH4 while Wurtz reactionwith metallic sodiumgives C2H6 Answer:(b)
Q.28
(CH3)3 CMgCl on reaction with D2O produces ..[ IIT 1997]
0%
a) (CH3)3CD
0%
b) (CH3)3OD
0%
c) (CD3)3CD
0%
d) (CD3)3OD
Explanation
Answer:(a)
Q.29
Which of the following compound will exhibit cis-trans ( geometrical) isomerism? [ AIMPT 2009]
0%
a) Butan-2-ol
0%
b) But-2-yne
0%
c) 2-Butenol
0%
d) But-2-ene
Explanation
Answer:(d)
Q.30
In Wurtz reaction, the reagent used is ...[ EAMCET 1998]
0%
a) Na
0%
b) Na/liqNH3
0%
c) Na/dry ether
0%
d) Na/ dry alcohol
Explanation
Answer:(c)
0 h : 0 m : 1 s
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