Pharm.D_POC_Alkanes & Alkenes_MCQ
1.Which one of the following reactions can be used to prepare alkanes?
A) Williamson synthesis
B) Friedel-crafts reaction
C) Kolbe’s electrolysis
D) All of these
2.Alkanes are ____ in water
A) Insoluble
B) soluble
C) solvent
D) None
3.Chlorination of alkanes is an example of________ reaction.
A) Radical
B) Free radical
C) elimination
D) addition
1.Which one of the following reactions can be used to prepare alkanes?
A) Williamson synthesis
B) Friedel-crafts reaction
C) Kolbe’s electrolysis
D) All of these
2.Alkanes are ____ in water
A) Insoluble
B) soluble
C) solvent
D) None
3.Chlorination of alkanes is an example of________ reaction.
A) Radical
B) Free radical
C) elimination
D) addition
4.Chloro ethane reacts with _____ to form diethyl ether.
A) NaOH
B) H2SO4
C) C2H5ONa
D) Na2S2O3
5.In methane the carbon is ________ hybridized.
A) Sp
b) Sp2
c) Sp3
d) Sp or Sp2
6.In free radical addition, orientation is governed by ----- rule?
A) Markovnikov
B) anti- Markovnikov
C) Saytzeff
D) Elimination
7.What is the order of reactivity of halogenation of alkanes
a) I>Br>Cl>F
b) F>Cl>Br>I
c) I>Cl>Br>F
d) F>Br>Cl>I
8.Which of the following reaction proceeds via free radicals initiated mechanism
a) Halogenation of alkane
b) Dehydrohalogenation of alkyl halide
c) Dehydration of alcohol
d) Kobes reaction
9.If propane undergos chlorination what will be the major product
a) 1-Chloro propane
b) 2-Chloro propane
c) 3-Chloro propane
d)4-Chloro propane
10. Chlorination of methane reaction demands which of the following conditions
a) Temperature 100°C
b) Temperature 50°C
c) UV Radiations
d) IR Radiations
11.What is the relative order of stability of free radical
a) 1°>2°>3°
b) 3°>2°>1°
c) 1°>3°>2°
d) 2°>1°>3°
12.The stability of alkene is determined by
A) Markonikov’s rule
B) Hund’s rule
C) Saytzeff’s rule
D) Huckel’s rule
13.Alkenes show geometrical isomerism due to
A) Asymmetry
B) Resonance
C) Rotation around a single bond
D) Restricted rotation around a double bond.
14.Which of the following reaction type is characteristic of alkenes?
A) Nucleophilic addition
B) Electrophilic addition
C) Electrophilic substitution
D) Nucleophilic substitution
15.What is the expected product formed from the reaction between 2-butene and Cl2?
A) 1-chlorobutane
B) 2-chlorobutane
C) 2,3-dichlorobutane
D) 2,2-dichlorobutane
16.Ethylene is a ________ molecule.
A) Polar
B) Non polar
C) Only A
D) None
17.The old name of alkenes was
A) Paraffins
B) Olefins
C) acetylene
D) None
18.The general formula for the alkenes is
A) CnH2n-2
B) CnH2n
C) CnHn
D) CnH2n+2
19.Markonikov's rule is applied when _______
a) symmetrical alkenes react with unsymmetrical reagents
b) unsymmetrical alkenes react with symmetrical reagent
c) symmetrical alkenes react with symmetrical reagents
d) unymmetrical alkenes react with unsymmetrical reagents
20.Karasch effect or peroxide effect takes place when the addition proceeds by _____ a) Ionic mechanism
b) free radical mechanism
c) ionic or free radical mechanism
d) formation of most stable carbonium ion
21.Dehydrogenation reactions involve use of ___________
a) Aqueous KOH
b) Alcoholic KOH
c) C2H5OH + Na
d) Zinc dust
22.The least reactive alkyl halide towards SN1 reaction is
A) Primary
B) Secondary
C) Tertiary
D) Quaternary
23.Which of the following is the substrate for dehydro halogenation
a) Alcohol
b) Alkane
c) Alkyl halide
d) Alkane nitrile
24. Carbocations are formed by
a) Homolytic bond dissociation
b) Heterolytic bond cleavage
c) Pericyclic bond cleavage
d) Illusive bond cleavage
25.Which of the following undergos elimination reaction
a) Alkyne
b) Nitro alkane
c) Alkane nitrile
d) alkyl halide
26.Which of the following is a addition reaction
a) Markonikovs reaction
b) Halogenation of alkane
c) Acetylation
d) Diazotisation
27.What is the relative order of stability of carbocations
a) 1°>2°>3°
b) 3°>2°>1°
c) 1°>3°>2°
d) 2°>1°>3°
28.Which of the following isotope reduces rate of E2 reaction to the maximum
a) Hydrogen
b) Duterium
c) Tritium
d) Crypton
29.Which halogenous acid participates in peroxide effect
a) HCl
b) HBr
c) HI
d) HF
30. Alkyl groups are
a) Electron withdrawing in nature
b) Electron donating in nature
c) Neither electron donating nor withdrawing
d) Both withdrawing and donating
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