ECAT Chemistry Online Test With Answers

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ECAT Chemistry Online Test

Sr. # Questions Answers Choice
1 2-Bromopentane is heated with potassium ethoxide in ethanol . The major product obtained is 2-Ethoxypentane Pent-1-ene cis-Pent-2-ene trans-Pent-2-ene
2 Chlorobenzene on heating with aqueous NH3under pressure in the presence of cuprous chloride gives Benzamide Nitrobenzene Aniline Chloroaminobenzene
3 Ethyl alcohol gives ethyl chloride with the help of SOCl<sub>2</sub> NaCl Cl<sub>2</sub> KCl
4 C6H6Cl6can be obtained from HCl and Benzene Cl<sub>2</sub>and Benzene and AlCl<sub>3</sub> Cl<sub>2</sub>and Benzene in diffused light NaOCl and Benzene
5 1, 3-Dibromopropane reacts with metallic zinc to form Propene Propane Cyclopropane Hexane
6 Replacement of Cl of Chlorobenzene to give phenol requires drastic conditions but chlorine of 2, 4-Dinitrochlorobenzene is readily replaced because NO<sub>2</sub>makes the electron rich ring at ortho and para positions NO<sub>2</sub>withdraws electrons at metaposition NO<sub>2</sub>donate electrons at m-position NO<sub>2</sub>withdraws electrons at ortho and para position
7 Which of the following reacts with chloroform and base to form phenyl isocynaide? Nitrobenzene Phenol Chlorobenzene Aniline
8 Iodoethane reacts with sodium in ether, the product formed is Pentene Propyne Butene Butane
9 When ethyl iodide and n-propyl iodide are allowed to react with sodium metal in ether, the number of alkanes that could be produced is Only one Two alkanes Three alkanes Four alkanes
10 The chloroform reacts with NaOH to give CH<sub>3</sub>COONa Sodium oxalate CH<sub>3</sub>OH HCOONa
11 Which of the following compounds on oxidation gives benzoic acid? Chlorophenol Chlorotoluene Chlorobenzene Benzyl chloride
12 The alkyl halide is converted into an alcohol by Addition Substitution Dehydrohalogenation Elimination
13 The final product formed by distilling ethyl alcohol with excess of Cl2 and Ca(OH)2is CH<sub>3</sub>CHO CCl<sub>3</sub>CHO CHCl<sub>3</sub> (CH<sub>3</sub>)<sub>2</sub>O
14 C- X bond is strong in CH<sub>3</sub>Cl CH<sub>3</sub>Br CH<sub>3</sub>F CH<sub>3</sub>I
15 The reaction of 4-bromobenzyl chloride with NaCN in ethanol leads to 4-Bromobenzyl cyanide 4-Cyanobenzyl chloride 4-Cyanobenzyle cyanide 4-Bromo 2-cyanobenzyl chloride
16 Which of the following does not give iodoform test? Ethanol Ethanal Acetophenone Bezophenone
17 Cl2reacts with CS2in presence of AlCl3to form CHCl<sub>3</sub> CCl<sub>4</sub> C<sub>2</sub>H<sub>5</sub>Cl C<sub>2</sub>H<sub>6</sub>
18 Benzene hexachloride is used as Dye Antimaterial drug Antibiotic Insecticide
19 The reaction between primary amine-chloroform and alcoholic caustic potash is called Wurtz reaction Frankland reaction Cannizzaro's reaction Carbylamine reaction
20 For the carbylamine reaction we need hot alc.KOH and Any amin and chloroform Chloroform and Ag powder A primary amine and chloroform A mono alkyl amine and trichlorom-ethane
21 The most reactive compound for electrophilic nitration will be Benzyl chloride Benzoic acid Nitrobenzene Chlorobenzene
22 What happens when CCl4is treated with AgNO3solution? NO<sub>2</sub>will be evolved A white ppt. of AgCl will form CCl<sub>4</sub>will dissolve in AgNO<sub>3</sub>solution Nothing will happen
23 Reaction of ethylamine with chloroform in alcoholic KOH produces CH<sub>3</sub>OH CH<sub>3</sub>NC C<sub>2</sub>H<sub>5</sub>NC C<sub>2</sub>H<sub>5</sub>CN
24 Ethyl chloride on treatment with aqueous alkali gives Ethane Ethene Ethanal Ethanol
25 DDT is formed from Benzene and Chlorobenzene Chloral and Chlorobenzene Chloral and Benzene Chlorobenzene and chlorine
26 Which of the following with aqueous KOH will give acetaldehyde? 1, 2-Dichloroethane 1,1-Dichloroethane Chloracetic acid Ethyl chloride
27 Aryl halides are less reactive towards nucleophilic substitution reactions as compared to alkyl halides due to The formation of less stable carbonium ion Resonance stabilization Larger carbon-halogen bond The inductive effect
28 Carbon atom holding halogen in aryl halides is sp<sup>2</sup>-hybridesed sp<sup>3</sup>-hybridesed sp-hybridesed sp<sup>3</sup>d-hybridesed
29 Which of the following reagent cannot be used for preparing alkyl chloride from alcohol? HCl + anhyd. Zncl<sub>2</sub> NaCl PCl<sub>5</sub> SOCl<sub>2</sub>
30 Benzene is prepared from n-hexane in the presence of catalyst Cr<sub>2</sub>O<sub>3</sub> Al<sub>2</sub>O<sub>3</sub> SiO<sub>2</sub> All above
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