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NEET Chemistry MCQ
Hydrocarbons Mcq Neet Chemistry
Quiz 2
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Q.1
Which of the following compounds will show geometrical isomerism? [ DPMT 2009]
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a) cyclohexene
0%
b) 2-Hexene
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c) 3-Hexyne
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d) 1, 1 -Diphenyl ethylene
Explanation
Answer:(b)
Q.2
(CH3)3CMgCl on reaction with D2Oproduces ... [IIT 1997]
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a) (CH3)3CD
0%
b) (CH3)3COD
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c) (CH3)CD
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d) (CH3)COD
Explanation
(CH3)3CMgCl + D2O → (CH3)3CD + Mg(OD)Cl Answer:(a)
Q.3
Reaction of HBr with propene in the presence of peroxide gives ...[ AIPMT 2004]
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a) isopropyl bromide
0%
b) allyl bromide
0%
c) n-propyl bromide
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d) 3-bromopropane
Explanation
Answer:(c)
Q.4
When CH3CH2CHCl2 is treated with NaNH2, the product formed is ...[ CBSE PMT 2002]
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a) CH3 -CH = CH2
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b) CH3 - C ≡ CH
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c)
0%
d)
Explanation
Answer:(b)
Q.5
Which of the following reactions will not give propane? [ DPMT 2005]
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a)
0%
b)
0%
c)
0%
d)
Explanation
Answer:(d)
Q.6
Reactivity of hydrogen atoms attached to different carbon atoms in alkaneshas the order ...[ CBSE PMT 1993]
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a) Tertiary > Primary > Secondary
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b) Primary > Secondary > Tertiary
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c) Tertiary > Secondary > Primary
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d) Both a and b
Explanation
Reactivity of H-atoms depends on the stability of free radicals they produce. Since the stability of free radicals follows the order Tertiary > Secondary > Primary , Therefore reactivity of H atoms follows the same order Answer:(c)
Q.7
The reaction of propene with HOCl proceeds via the addition of ...[ IIT 2001]
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a) H+ in the first step
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b) Cl+ in the first step
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c) OH- in the first step
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d) Cl- and OH- single step
Explanation
Answer:(b)
Q.8
Which reacgent can be used to convert, halides, alcohols, carbonyl compounds, acids, etc to alkane
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a) Zn - Hg/HCl
0%
b) Red P + HI
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c) LiAlH4
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d) None of these
Explanation
Red P + HI is a strong reducing agent Answer:(b)
Q.9
Markovnikov's rule is applicable to ... [ DPMT 1994]
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a) CH2 = CH2
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b) CH3-CH2-CH3
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c) CH3-CH = CH - CH3
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d)
Explanation
Markovnikov's rule is applicable to unsymmetric alkane Answer:(d)
Q.10
ion Q40) Consider the following reaction . Identify the structure of the major product X ..[ IIT 2002]
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a)
0%
b)
0%
c)
0%
d)
Explanation
Bromination is highly selective, occur at the carbon, where the most stable free radical is formed Answer:(b)
Q.11
Number of bonds in benzene molecule are ...[ DPMT 2005]
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a) 3σ and 12π
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b) 6σ and 3π
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c) 12σ and 3π
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d) 6σ and 6π
Explanation
Answer:(c)
Q.12
Which of the following methods is most appropriate for the manufacture of methane? [ CPMT 2000 ]
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a) By reduction of CH2Cl2
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b) Wurtz reaction
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c) Liquefaction of natural gas
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d) None of these
Explanation
Answer:(c)
Q.13
ion Q43) Predict the product 'C' obtained in the following reaction of 1-butyne ..[ AIPMT 2007]
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a)
0%
b)
0%
c)
0%
d)
Explanation
Answer:(b)
Q.14
Which of the following is the predominant product in the reaction of HOBr with propene? [ DEC 1994]
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a) 2-bromo-1-propanol
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b) 3-bromo-1-propanol
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c) 2-bromo-2-propanol
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d) 1-bromo-2-propanol
Explanation
Answer:(d)
Q.15
Photochemical halogenation of alkane is an example of ...[ PMT Kerala 2012]
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a) electrophilic substitution
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b) nucleophilic substitution
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c) free radical substitution
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d) nucleophilic addition
Explanation
In reaction for a photochemical, one Free radical halogenation is a reaction that substitutes a chlorine or a bromine for a hydrogen on an alkane. Answer:(c)
Q.16
Pentene-1 with HCl gives ...[ Pb CET 1991]
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a) 3-chloropentane
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b) 2-chlropentane
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c) 1,2-dichoropentane
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d) 1-chloropentane
Explanation
Answer:(b)
Q.17
Toluene by Etard's reaction gives ...[ DPMT 2006]
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a) benzyl chloride
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b) benzaldehyde
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c) benzene alcohol
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d) ortho-cresol
Explanation
Answer:(b)
Q.18
When an aqueous solution containg sodium acetate and sodium propionet is electrolysed we get
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a) Ethane
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b) Propane
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c) Butane
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d) All the baove
Explanation
Answer:(d)
Q.19
2.8g pf pure alkene contain only double bond per moleculess, react completely with 8g of bromine. What is the molecular formula o the alkene? [ DEC 1994]
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a) C2H4
0%
b) C4H8
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c) C3H4
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d) C6H12
Explanation
Molecular weight of bromine gas is 160 g/mole Now 8g = 2.8g hydrocarbon 160g = Xg hydrocarbon Thus X = 56g is the molecular weight of hydrocarbon.Thus alene is C4H8 Answer:(b)
Q.20
In electrophilic aromatic substitution reaction, the nitro group is meta- directing because it :...[ Karataka CET 2009]
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a) decreases electron density at meta- position
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b) increases electron density at meta- position
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c) increases electron density at ortho- and para- positions
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d) decreases electron density ar ortho- and para- position
Explanation
The -NO2 group is meta- directing because it decreases electron density at o-p -positions Answer:(d)
Q.21
Which alkene on ozonolysis gives CH3CH2CHO and CH3COCH3? [ AIPMT 2001]
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a) CH3CH2CH = CHCH2CH3
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b) CH3CH2CH = C(CH3)2
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c) CH3CH2CH = CHCH3
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d) (CH3)2C = CHCH3
Explanation
Answer:(b)
Q.22
A mixture of ethyl iodide and n-propyl iodide is subjected to Wurtz reaction. Thehtdrocarbon wihich will not be formed is ... [ IIT 1990]
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a) Butane
0%
b) Propane
0%
c) Pentane
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d) Hexane
Explanation
2R-X + 2Na → R=R +2Na+X- Thus propane will not prodce R-X + R'-X + 2Na → R=R' + 2Na+X- Pentenone will produce Answer:(b)
Q.23
Which of the following compounds yields acetone on ozonolysis followed by hydrolysis? [ BHU 2008]
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a) 2-Methyl-2-butene
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b) 3-Methyl-1-butene
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c) Cyclopentane
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d) 2-Methyl-1-butene
Explanation
Answer:(a)
Q.24
3-Hexyne reacts with Na/liq. NH3 to produce ...[ AIIMS 1997]
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a) cis-3-hexaene
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b) trans-3-hexene
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c) 3-hexylamine
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d) 2-Hexylamine
Explanation
Answer:(b)
Q.25
When CH3COOH reacts with CH3MgX, then ....[ BCECE (Med.)2006]
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a) CH3COX is formed
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b) hydrocarbon is formed
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c) acetone is formed
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d) alcohol is formed
Explanation
CH3COOH + CH3MgX → CH3 On further reaction with water we get carboxylic aicd Answer:(b)
Q.26
Acetylene when trated with dilute HCl at 60°C (333K) in presnece of HgCl2 produces ...[ Pb CET 1989]
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a) Methyl chloride
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b) Vinyl chloride
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c) Acetaldehyde
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d) Formaldehyde
Explanation
Answer:(b)
Q.27
Which one of the following has the smallest heat of hydrogenation per mole? [ IIT 1993]
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a) 1-butene
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b) trans-2-butene
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c) cis-2-butene
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d) 1,3-butadiene
Explanation
Among alkenes-heat of hydrogenation depends on (a) The number of double bonds-greater the number of double bonds, greater the amount of heat evolved in hydrogenation. Hence 1,3-butadiene has highest heat of hydrogenation among these (b) Relative stability of alkenes-greater the stability, smaller the heat evolved inhydrogenation. Trans-2-butene is most stable among three given butenes, has heat of hydrogenation Answer:(b)
Q.28
ion Q58) In the reaction X is
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a) HNO3
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b) O2
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c) O3
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d) KMnO4
Explanation
O3 convetrs alkynes to 1-2-diketones Answer:(c)
Q.29
A new carbon-carbon bond formation is possible in ...[ DPMT 2009]
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a) Cannizzaro's reaction
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b) Friedel-Craft alkylation
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c) Clemmensen reduction
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d) Reimer-Tiemann reaction
Explanation
A new C-C bond formation is possible in Friedel-Craft alkylation (C-R) and Reimer - Tiemann reaction (C-CHO or C- COOH) Answer:(b, d)
Q.30
Which of the following is not aromatic? [ Kerala PMT 2006]
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a) Benzene
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b) Cyclopropenyl cation
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c) Tropylium cation
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d) Cyclopentadienyl cation
Explanation
Cyclopentadienyl cation does not obey Huckel rule and hence is not aromatic Answer:(d)
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