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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 |
