ECAT Chemistry Online Test With Answers

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ECAT Chemistry Online Test

Sr. # Questions Answers Choice
1 Hydrolysis of Grignard's reagent gives: Alcohol Halide Alkyl Alkane
2 Organic compounds containing halogen atom are called: R---OH R----X R----NH<sub>2</sub> R----COH
3 The order of reactivity for a given halogen in Grignard's reagent is: CH<sub>3</sub>X &gt; C<sub>2</sub>H<sub>5</sub>X &gt; C<sub>3</sub>H<sub>4</sub>X &gt; C<sub>4</sub>H<sub>4</sub>X C<sub>2</sub>H<sub>5</sub>X &gt; C<sub>3</sub>H<sub>7</sub>X &gt; C<sub>4</sub>H<sub>5</sub>X &gt; CH<sub>4</sub>X C<sub>3</sub>H<sub>7</sub>X &gt; C<sub>4</sub>H<sub>7</sub>X &gt; CH<sub>3</sub>X &gt; C<sub>2</sub>H<sub>5</sub>X C<sub>4</sub>H<sub>4</sub>X &gt; C<sub>3</sub>H<sub>7</sub>X &gt; C<sub>2</sub>H<sub>5</sub>X &gt; CH<sub>4</sub>X
4 Reactivity of alkyl halides with magnisium is of the order: Rl &gt; RBr&gt; RCl &gt; RF RBr &gt; RCl &gt;RF &gt; Rl RCL &gt; RF &gt; Rl &gt; RBr RF &gt;RI &gt;RBr &gt; RII
5 Grignard's reagent was prepared in: 1900 1910 1920 1930
6 Steps in SN , reactions are: One Two Three Four
7 Electronegativity order of alkyl halides is: Rl &gt; RBr &gt; RCl &gt; RF Rbr &gt; RCl &gt; RF &gt;Rl RCl &gt; RF &gt;Rl &gt; RBr RF &gt;Ri &gt; RBr &gt;RII
8 Catalyst in the reaction ROH + SOCl2-------> RCL+SO2+HCl is: ZnCl<sub>2</sub> Pyridine H<sub>2</sub>SO<sub>4</sub> Either
9 Primary carbon attaches with other hydrogen atoms directly: One Two Three At least one or more than it
10 Reation of which with Grignard's reagent gives primary alcohol: Formaldehyde Aldehyde Ketones Acetone
11 Reaction of Griganard's reagent with CO2gives: Aldehyde Pri-alcohol Sec-alcohal Carboxylic acid
12 Metal used in the preparation of Grignard's reagent is: Ca Na Mg Zn
13 E2has molecularity : One Two Three Half
14 SN2 reaction has order of reaction : First Second Third Zero
15 Alkyl halides are reactive : High Medium Less Least
16 Best medhod of preparation of alkyl halide from alcohals is by its reaction with: HX SOCl<sub>2</sub> Px<sub>5</sub> and PX<sub>3</sub> All
17 General formula of alkyl halide is: R----X R----OH R------COH R------COOH
18 which one of the following is not a nucleophile? H<sub>2</sub>O H<sub>2</sub>S BF<sub>3</sub> NH<sub>3</sub>
19 The rate of E1reaction depends upon: The concentration of substrate The concentration of nucleophile The concentration of substrate as well as nucleophile None of these
20 Alkyl halides are considered to be very reactive compounds towards nucleophiles, because: They have an electrophilic carbon They have an electrophilic carbon and good living gorup They have an electrophilic carbon and bad living group They have an nucleophilic carbon and good living gorup
21 For which mechanisms, the first step involved is the same: E<sub>1</sub> and E<sub>2</sub> E<sub>2</sub>and SN<sub>2</sub> E<sub>2</sub> and E<sub>1</sub> E1 and SN<sub>1</sub>
22 Elimination bimolecular reactions involve: First order Kinetics Third order kinetics Zero order kinetics
23 SN2reactions can be best carried out with: Prl. alkyl halide Sec. Alkyl halide Ter. Alkyl halide All of three
24 Grignard reagent is reactive due to : The presence of halogen atom The presence of Mg atom The polarity of C - Mg bond None of them
25 When CO2 is made to react with ethyl megnesium iodine, followed by hydrolysis, the product formed is: Propane Propanoic acid Propanal Propanol
26 The reactivity order of alkyl halides for a particular alkyl group is: F &gt;Cl&gt;Br&gt;I Cl&gt;Br&gt;F&gt;l l&gt;Br&gt;Cl&gt;F Br&gt;l&gt;Cl&gt;F
27 In primary alkyl halides, the halogen atom is attached to a carbon which attached to how many carbon atoms? Two Three One Four
28 Hydrocarbons contain : Carbon only carbon Hydrogen only Carbon &amp; hydrogen Carbon , hydrogen &amp; halogen
29 Which one gives acidic reactions? CH<sub>3</sub>----C<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">≡C-------CH<sub>3</sub></span> CH<sub>3</sub>-----CH<sub>2</sub>-----HC=CH----CH<sub>2</sub> CH<sub>3</sub>----CH=CH<sub>2</sub> CH<sub>3</sub>-----C<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">≡CH</span>
30 Mustard gas is a : Gas Liquid Solid High boiling point
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