ECAT Chemistry Online Test With Answers

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ECAT Chemistry Online Test

Sr. # Questions Answers Choice
1 Which of the following undergoes uncleophilic substitution exclusively by SN1 mechanism? Benzyl chloride Ethyl chloride Chlorobenzene Isopropyl choride
2 Alkyl halides react with lithium dialkyl copper reagents to give Alkenes Alkyl copper halides Alkanes Alkenyl halides
3 Tertiary alkyl halides are practically inert to substitution by SN2 mechanism because of Onsolubility Instability Inductive effect Steric hindrance
4 Which of the following compounds gives trichoromethane on distilling with bleaching power? Methanal Phenol Ethanol methanol
5 Which represents nucleophilic aromatic substitution reaction? Reaction of benzene with Cl<sub>2</sub>in sunlight Benzyl bromide hydrolysis with water Reaction of NaOH with dintrofluoro benzene Sulphonation of benzene
6 Which responds to +ve iodoform test? Butanol-1 Butan-1-al Butanol-2 2-pentanone
7 Among the following the most reactive towards alcoholic KOH is CH<sub>2</sub>= CHBr CH<sub>3</sub>COCH<sub>2</sub>CH<sub>2</sub>Br CH<sub>3</sub>CH<sub>2</sub>Br CH<sub>3</sub>CH<sub>2</sub>CH<sub>2</sub>Br
8 Allyl chloride on dehydrochlorination gives Propadiene Propylene Allyl alcohol Acetone
9 When chloroform is boiled with NaOH, it gives Formic acid Trihydroxymethane Acetylene Sodium formate
10 A set of compounds in which reactivity of halogen atom in the ascending order is Chlorobenzene, vinyl chloride, chloroethane Chloroethane, chlorobenzene, vinyl chloride Vinyl chloride,chlorobenzene chloroethane Vinyl chloride, chloroethane,chlorobenzene
11 Most reactive halide towards SN1 reaction is n-Butyl chloride sec-Butyl chloride tert-Butyl choride Allyl chloride
12 Grignard reagent is not prepared in aqueous medium but prepared in ether medium because The reagent is highly reactive in ether The reagent does not react with water The reagent becomes inactive in water The reagent reacts with water
13 When primary amine reacts with chloroform in ethanolic KOH, then the product is An isocyanide An aldehyde A cyanide An alcohol
14 Unpleasant smell of carbylamine is obtained when chloroform and alcoholic KOH are heated with Any aromatic amine Any primary amine Any amine Any aliphatic amine
15 Which one of the following in mainly responsible for depletion of ozone layer? Methane Carbon dioxide Water chloroflurocarbons
16 The reaction of an alkyl halide with RCOOAg produces Ester Ether Aldehyde Ketone
17 On warming with silver powder,chloroform is converted into Acetylene Hexachloroethane 1,1,2,2-tetrachloroethane ethylene
18 Which one of the following will have the maximum dipole moment CH<sub>3</sub>F CH<sub>3</sub>Cl CH<sub>3</sub>Br CH<sub>3</sub>l
19 Alkyl halides react with Mg in dry ether to form Magnesium halide Grignard's reagent Alkene Alkyne
20 To get DDT, chlorobenzene has to react with one of the following compound in the presence of conc.H2SO4 Trichloroethane Dichloroacetone Dichloroacetaldehyde Trichloroacetealdehyde
21 Cyanoform is ________ acid in nature than the chloroform. The missing word is Stronger Weaker Amphoteric Neutral
22 Which halide among the following is used as methylating agent? CH<sub>3</sub>l C<sub>2</sub>H<sub>5</sub>Cl C<sub>2</sub>H<sub>5</sub>Br C<sub>6</sub>H<sub>5</sub>Cl
23 How many monochlorobutanes will be possible on chlorination of n-butane? 1 2 3 5
24 SN1 reaction of alkylhalides leads to Retention of configuration Recemisation Inversion of configuration None of these
25 Tetrabromoethane on treatment with alcoholic zinc gives Ethylbromide Ethane Ethene Ethyne
26 Gammexane is Chlorobenzene Benzyl chloride Brommobenzene Benzene hexachloride
27 Benzene reacts with chlorine to form benzene hexachloride in presence of Nickel AlCl<sub>3</sub> Bright sunlight Zinc
28 Ethyl bromide on treatment with alcoholic KOH gives Ethylene Ethanol Acetic Acid Ethane
29 Butanenitrile is formed by reaction of KCN with Propyl alcohol Butyl chloride Butyl alcohol Propyl Chloride
30 1-Chlorobutane on reaction with alcoholic potash gives But 1-ene Butan-1-ol But-2-ene Butan-2-ol
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