MDCAT Chemistry Chapter 14 Chemistry of Hydrocarbons Online Test With Answers

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MDCAT Chemistry Chapter 14 Chemistry of Hydrocarbons Online Test

Sr. # Questions Answers Choice
1 Which one of the following is NOT a nucleophile NH2+ BF3 H2O CH3-
2 The order of reactivitv of alksI halides towards nucleophile is RI>RBr RF>RCI RF>RCI>RBr>RI RI>RBr> RCI>RE RF>RBr>RCI>RI
3
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:
 H20 at room temperature KOH in alcohol Ethanol. heat Dilute NaOH(aq) warm
4 When purely alcoholic solution of sodium/potassiumhydroxide and halogenoalkanes are reacted an alkene is formed, what is the mechanism of reaction? Elimination Debromination Dehydration Reduction
5 Correct order for the reactivity ofalkyl halide in S, reactions R-I>R-F>R-CI R-F>R-CI>R-I R-I>R-CI>R-F R-CI>R-I>R-F
6 Correct statement about Nucleophilic substitution bimolecular is Transition state is formed Inversion take place It is two step reacticn Both a &c
7 The reaction C2H5CI + aqueous KOH---------C2H5OH+ KCI is Electrophilic addition Nucleophilic addition Electrophilic substitution Nucleophilic substitution
8 An alkyl halide reacts with NH3 to give Amide Cyanide Amine Aniline
9 Out of monochloro, monobromo and mongiodo derivatives of ethane, the mos reactive compound towards nucleophilic substitution will be C2H5Br C2H5Cl C2H5I All are equally reactive
10 Elimination unimolecular reactions involve Second order kinetics First order kinetics Third order kinetics Zero order kinetics
11 Which of the following is primary alkyl halide IsopropyI halide Sec-butyl halide Tert-buryi halide Neo-pentyl halide
12 Which isomer of C4H9Br will produce 2-methyl propane-2-ol on treatment with aqueous KOH n-butyI bromide Sec-butyI bromide Isobutyl halide Tertiary butyl chloride
13 Which one of the following is not associated with SN2 mechanism 100 % inversion of configuration Tertiar alkyI halides 2nd order kinetics Change of hy bridization from sp³ to sp² in transition state
14 Which of the following factors does not affect the SN1 rate is Nucleophilicity of the attacking nucleophile Stability of the carbonium ion Solvent system The nature of leaving group
15 In the transition state of S2 mechanism reaction with alkyl halides, which of the following orbital hybridization is involved sp³ sp sp² dsp³
16 Which of the following decides the reactivity of alkyl halides? C-C bond strength C-H bond strength C-X bond strength Electronegativity difference
17 Chloroform (CHCl3) is? Primary alkyl halide Secondary alkyl halide Tertiary alkyl halide a liquid
18 Which is a good nucleophile as well as a good leaving group? F- Cl- Br- I-
19 An amine is produced in the following reaction
C2H5l+2NH3-------C2H5NH2 +NH4l. What is mechanism?		 Electrophilic addition Electrophilic substitution Nucleophilic addition Nucleophilic substitution
20 The Sl mechanism for the hydrolysis of an alkyl halide to an alcohol involves the formation of Carbocation Carbanion Pentavalent carbon in the transition state Free radical
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