ECAT Chemistry Online Test With Answers

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ECAT Chemistry Online Test

Sr. # Questions Answers Choice
1 When metallic sodium in ether is heated with ethyl chloride, which alkane is formed Propane Ethane Iso-butane N-butane
2 Grignard's reagent on treatment with carbonyl compounds yield Pheonol Alcohol Alkane None of these
3 Grignard's reagent on treatment with dry CO2and HCI yields Ester Alcohol Carboxylic acid Aldehyde
4 Grignard's reagent on treatment with chloramine give Acetamide Primary amice Secondary amice Urea
5 Hydrolysis of Grignard's reagent yields Alcohol Aldyhyde Ester Alkane
6 Alkyle magnesium halides are known as Simon-smith reagent Tollen's reagent Grignard's reagent Barford's reagent
7 A reaction in which an atom or a group of atoms replaces an atom or a group of atoms in the molecule of a substance is known as Addition reaction Condensation reaction Elimination reaction Substitution reaction
8 Alkyl halides on treatment with aqueous KOH give Phenol Alcohol Aldehyde Ketone
9 Action of Zn with alkyl halides in the presence of an inert solvent forms higher alkanes. This reaction is known as Wurtz reaction Frankland's reaction Cannizaro reaction Kalobe's reaction
10 Dehydrohalogenation of alkyl halides give Alkanes Alkenes Alkynes Alkdehyde
11 By reaction Grignard's reagent with the HCHO we get 1° - alcohol 2° - alcohol 3° - alcohol All of these
12 Alkyl halides on treatment with Zn and HCI gives Alkanes Alkenes Alkynes Alcohols
13 Alkyl halides on treatment with metallic Na give Alkynes Alkenes Alkanes Alcohols
14 The reaction of alcohol with SOCI2in the presence of pyridine as catalyst gives Acids Acid chloride Alkyl halide Benzene
15 Halogens on treating with silver salts of acids give Alcohol Ester Phenol Alkyl halide
16 E1mechanism is generally shown by 1° - RX 2° - RX 3° - RX None of these
17 When alkyl halides are heated with aqueous solution of ammonia at about 100°C, amines are formed. This reaction is known as Williamsons synthesis GHoffmans reaction Wurtz reaction Clemensen reaction
18 Alkanes may be prepared by the reaction of alkyl halides with Alcohol Carboxylic acid Grignard reagents None of these
19 Reduction of alkyl halides give Alkanes Alkenes Ketones Ether
20 Alkyle halides can be prepared by treating halogen acids with Ethane Ethanol Ethene and ethanol Aldehyde
21 The general formula of alkyl halides is C<sub>n</sub>H<sub>2n</sub>X C<sub>n</sub>H<sub>2n-1</sub>X C<sub>n</sub>H<sub>2n+1</sub>X C<sub>n</sub>H<sub>2n-2</sub>X
22 The alkyl halide molecule on which a nucleophile attacks is called Substrate Subsituent Substituted All of these
23 Which one of the following is not a nuclelphile H<sub>2</sub>O H<sub>2</sub>S BF<sub>3</sub> NH<sub>3</sub>
24 The rate of E1reaction depends upon The concentration of substrate The concentration of nucleophile THe concentration of substrate as well as nucleophile None of the above
25 Alkyl halides are considered to be very reactive compounds towards nucleophiles because They have an electrophilic carbon They have an electrophilic carbon and a good leaving group They have an electrophilic carbon and a bad leaving group They have a nucleophilic carbon and a good leaving group
26 Both E1and E2mechanism can be shown by 1° - RX 2° - RX 3° - RX None of these
27 Elimination bimolecular reactions usually obey First order kinetics Second order kinetics Third order kinetics Zero order kinetics
28 SN2 reaction can be best carried out with Primary alkyl halides Secondary alkyl halides Tertiary alkyl halides All the three
29 Grignad reagent is reactive due to The presence of halogen atom The presence of Mg atom The polarity of C - Mg bond None of above
30 When carbon dioxide is passed through the R - Mg - X is produced Any carboxylic acid Propanoic acid Propanedioic acid None of these
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