ECAT Chemistry Online Test With Answers

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ECAT Chemistry Online Test

Sr. # Questions Answers Choice
1 The reactivity order of alkyl halides for a paricular alkyl group is Fluoride > chloride > bromide > iodide Chloride > bromide > fluoride > iodide Iodide > bromide > chloride > fluoride Bromide > iodide > chloride > fluoride
2 An electrophile may be Positive Negative Neutral Both c and a
3 Grignard reagent is prepared by the reaction of magnesium metal with alkyl halide in the presence of Alcohol Water Suephuric acid Dry ether
4 Which is a weak nucleophile OH<sup>-</sup> Br<sup>-</sup> NH<sub>3</sub> CI<sup>-</sup>
5 Which of the followings is not a nulceophile OH<sup>-</sup> NH<sub>3</sub> C<sub>2</sub>H<sub>5</sub>O<sup>-</sup> Br<sub>2</sub>
6 The order of reactivity of an alkyl halide (R-X) for a particular alkyl group is Iodide &gt; bromide &gt; chloride Chloride &gt; bromide &gt; iodide Bromide &gt; chloride &gt; iodide Bromide &gt; iodide &gt; chloride
7 Which bond is most stable C - Cl C - F C - Br C - I
8 With the increase in size of halogen atom the reactivity of an alkyl halide Increases Decreases Remain constant None of these
9 When an alcohol reacts with SOCI2an alkyl halide is formed. What are two other products SO<sub>2</sub>and HCI SI<sub>2</sub>and H<sub>2</sub>O HCI and H<sub>2</sub>O H<sub>2</sub>S and HCI
10 2-bromo-3-methylbutane 3-methyl-2-bromobutane 2-methyl-3-bromobutane All of these
11 Primary alkyl halide Secondary alkyl halide Tertiary alkyl halide None of these
12 In a primary alkyl halide, the halogen atom is attached to a carbon which is further attached to Only one carbon atom Two carbon atoms Three carbon atoms one or no carbon atom
13 4-methyl pentene 2-methyle-1-butene 2-methyl propane None of the above
14 De halogenatiion of tetrahalides happens in the presence of active metal like Zn Mg Both a and b None of them
15 The four bonds of carbon in methane are directed towards the corners of Cube Pentagon Hexagon Tetrahedron
16 The next homologue of C10H22will be C<sub>9</sub>H<sub>20</sub> C<sub>12</sub>H<sub>26</sub> C<sub>11</sub>H<sub>24</sub> C<sub>13</sub>H<sub>28</sub>
17 Which one of the following gases is used for artificial ripening of fruits Ethene Ethane Methane Propane
18 Synthesis of rubber is made by polymerization of Chloroform Acetylene Divinylacetylene Butene
19 The addition of unsymmetrical reagent to an unsymmetrical alkene is in accordance with the rule Hund's rule Markowvikov's rule Pauli's exclusion principle Auf ban principle
20 Which can be used for dehydration of alcohol P<sub>4</sub>O<sub>10</sub> H<sub>2</sub>SO<sub>4</sub> H<sub>3</sub>PO<sub>4</sub> All of them
21 Preparation of vegetable ghee involves Halogenations Hydrogenations Hydroxylation Dehydrogenations
22 Which one of the following gases is used for artificial ripening of fruits Ethane Ethyne Methane Propane
23 When methane reacts with Cl2in the presence of diffused light the products obtained are Chloroform only Carbon tetrachloride only Chloromethane and dichloromethane Mixture of a, b, c
24 B-B'-dichloroethyl sulphide is commonly known as Mustard gas Laughing gas Phosgene gas Bio gas
25 Synthetic rubber is made by polymerization of Chloroform Acetylene Divinlacetylene Butene
26 The addition of unsymmetrical reagent to an unsymmetrical alkene is in accordance with Hund's rule Markownikov's rule Pauli's Exclusion principle Auf ban principle
27 Vinyl acetylene combines with HCI to form Poly acetylene Benzene Chloroprene Divinylacetylene
28 The correct order of reactivity of halogens with alkanes is l<sub>2</sub>&gt; Br<sub>2</sub>&gt; Cl<sub>2</sub>&gt; F<sub>2</sub> l<sub>2</sub>&gt; Cl<sub>2</sub>&gt; F<sub>2</sub>&gt; Br<sub>2</sub> F<sub>2</sub>&gt; Cl<sub>2</sub>&gt; l<sub>2</sub>&gt; Br<sub>2</sub> F<sub>2</sub>&gt; Cl<sub>2</sub>&gt; Br<sub>2</sub>&gt; l<sub>2</sub>
29 Formula of chloroform is CH<sub>3</sub>CI CCI<sub>4</sub> CH<sub>2</sub>CI<sub>2</sub> CHCI<sub>3</sub>
30 Preparation of vegetable ghee involves Halogenations Hydrogenation Hydroxylation Dehydrogenation
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