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MDCAT Chemistry Chapter 14 Chemistry of Hydrocarbons Online Test MCQs With Answers
Question # 1
In an elimination reaction a more substituted alkene is formed due to the stability associated with
Choose an answer
Free radical
transition state
Activated complex
Carbocation
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Question # 2
Correct order for the reactivity ofalkyl halide in S, reactions
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R-I>R-F>R-CI
R-F>R-CI>R-I
R-I>R-CI>R-F
R-CI>R-I>R-F
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Question # 3
Chloroform (CHCl3) is?
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Primary alkyl halide
Secondary alkyl halide
Tertiary alkyl halide
a liquid
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Question # 4
SN2-reactions can be usually observed in
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Primary alkylı halide
secondary alkyl halide
Tertiary alkyl halide
Both A. and B
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Question # 5
Which of the following factors does not affect the SN1 rate is
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Nucleophilicity of the attacking nucleophile
Stability of the carbonium ion
Solvent system
The nature of leaving group
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Question # 6
The order of reactivitv of alksI halides towards nucleophile is
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RI>RBr RF>RCI
RF>RCI>RBr>RI
RI>RBr> RCI>RE
RF>RBr>RCI>RI
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Question # 7
Reaction of ethyl bromide with ammonia
Choose an answer
Completes in a single step
Completes in two steps
Continues till N is left with no lone pair
is reversible
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Question # 8
The reagent for alkaline hydrolysis of ethyl bromide to form ethyl alcohol is
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water at room T
Alcoholic KOH+heat
Ethanol + heat
dil. NaOH+ heat
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Question # 9
Which of the following reactants will be required to form ethene from ethyl chloride
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Alcoholic KOH
Alkaline KMnO4
Aqucous KOH
Aqucous NaOH
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Question # 10
The Sl mechanism for the hydrolysis of an alkyl halide to an alcohol involves the formation of
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Carbocation
Carbanion
Pentavalent carbon in the transition state
Free radical
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Question # 11
Elimination unimolecular reactions involve
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Second order kinetics
First order kinetics
Third order kinetics
Zero order kinetics
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Question # 12
The average bond energy of C-Br is
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228 kJmol-1
250 kJmol-1
200 kJmol-1
290 kJmol-1
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Question # 13
An alkyl halide reacts with NH3 to give
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Amide
Cyanide
Amine
Aniline
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Question # 14
In nucleophilie substitution bimolecular reaction the order of reaction with respect to substrate
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2 order
3 order
1st order
Zero order
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Question # 15
The carbon atom of an alkyl group attached with halogen atom is called
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Electrophile
Free redical
Nucleophile
Nucleophilic centre
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Question # 16
Which of the following alkyl halides undergoes SN1 reaction fastest
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Methyl chloride
Isobutyl chlorido
Ethy l chloride
Tertiary butyl chloride
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Question # 17
In beta elimination reaction
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carbon number changes
unsaturated compound is formed
hybridization. ofC remains same
pi bonds are decreased
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Question # 18
The rate of E1 reaction depends upon
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The concentration of substrate
The concentration of substrate as well as nucleophile
The concentration Nucleophilic
Nature of Catalyst
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Question # 19
Which is an intermediate in SN1 reaction
Choose an answer
Ethoxide ion
Carbocation
alkyl halide
alkene
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Question # 20
When purely alcoholic solution of sodium/potassiumhydroxide and halogenoalkanes are reacted an alkene is formed, what is the mechanism of reaction?
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Elimination
Debromination
Dehydration
Reduction
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Question # 21
Alkyl halides are considered to be very reactive compounds towards nucleophiles, because
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The have an electrophilic carbon
They have an electrophilic carbon and a bad leaving group
They have an electrophilic carbon and a good laving group
They have a nucleophilic carbon and a good leaving group
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Question # 22
A mixture of 1-chloropropane and 2-chloro-propane when treated with alcoholic KOH, gives
Choose an answer
Prop-2-ene
Isopropy lene
Propene
A mixture of prop-l-ene
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Question # 23
The alkaline hydrolysis of bromoethane shown below gives alcohol as the product: H3C-CH2-Br-------H3C-CH2-OH
The reagent and the condition used in this reaction may be:
Choose an answer
H20 at room temperature
KOH in alcohol
Ethanol. heat
Dilute NaOH(aq) warm
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Question # 24
Which of the following reactions does not involve formation of carbocation?
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SN1 and E1
El and E2
SN1 and SN2
E2 and SN2
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Question # 25
When 2-bromobutane reacts with alcoholic KOH, the reaction is called
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Chlorination
Halogenation
Dehydrohalogenation
Hydrogenation
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Question # 26
To prepare ethane by Wurtz synthesis the suitable alkyl halide is
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Ethyl iodide
any alkyl iodide
Ethyl chloride
Methyl bromide
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Question # 27
Which one of the following is NOT a nucleophile
Choose an answer
NH2+
BF3
H2O
CH3-
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