ECAT Chemistry Online Test With Answers

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ECAT Chemistry Online Test

Sr. # Questions Answers Choice
1 Which acid is used in the manufacture of synthetic fibre Formic acid Phthalic acid Carbonic acid Acetic acid
2 Carboxylic acids generally exists in cyclic Monomers Dimers Trimers Tetrameter
3 When a carboxylic acid reacts with a metal ______ gas is evolved H<sub>2</sub> CO<sub>2</sub> CI<sub>2</sub> None of these
4 Acidic amino acid Basic amino acid Neutral amino acid None of these
5 Essential amino acids are those amino acids which Body can not synthesize Body can synthesize <span style="color: rgb(34, 34, 34); font-family: &quot;Times New Roman&quot;; font-size: 24px; text-align: center; background-color: rgb(255, 255, 248);">α</span>-amino acids <span style="color: rgb(34, 34, 34); font-family: &quot;Times New Roman&quot;; font-size: 24px; text-align: center; background-color: rgb(255, 255, 224);">β</span>-amino acids
6 Proton donar Dehydrating agent Catalyst Electrophile
7 Easter are pleasant smelling compounds. Which ester posseses odour like pineapple Amylacetate Amylbutyrate Ethylbutyrate Benzylacetate
8 Alkyl Alkyl nitrile Cyanogens Amine
9 The acids obtained by the hydrolysis of fats and oils are called Active compound Fatty acids Functional group None
10 Monocarboxylic acids exist as dimer because of Dipole-dipole attraction Hydrogen bonding Van der Waals forces Conhesive forces
11 With the increase in carbon no. the solubility of carboxylic acids Increases Decreases Remains same None of these
12 Carboxylic acid can generally be prepared by various methods. Which of the following methods is not suitable for making carboxylic acids By the oxidation of primary alcohols By the hydrolysis of nitriles By the carbonation of Grignard, reagent By the hydrolysis of p-amines
13 The common name of propanoic acid is Acetic acid Formic acid Propionic acid Butyric acid
14 A common industrial solvent is a mixture of propanone; CH3COCH3, and pentyl ethanoate CH3CO2(CH2)4CH3. Which reagent would have no effect on this solvent Na<sub>(s)</sub> NaBH<sub>4</sub> NaOH<sub>(aq)</sub> 2,4-dinitrophenylhydrazine reagent
15 Which of these reactions is shown by buranone, CH3COCH2CH3 On warming with acidified potassium dichromative (IV) the solution turns green On heating with Fehling's reagent a red precipitate is formed With 2,4-dinitrophenlhydrazine reagent an orange precipitate is formed With hydrogen cyanide an aldehyde is formed
16 With H<sub>2</sub>/Ni CH<sub>3</sub>(CH<sub>2</sub>)<sub>5</sub>CH<sub>2</sub>OH With H<sub>2</sub>/Ni CH<sub>3</sub>(CH<sub>2</sub>)<sub>5</sub>CH<sub>3</sub> With NaBH<sub>4</sub> CH<sub>3</sub>(CH<sub>2</sub>)<sub>5</sub>CH<sub>2</sub>OH With NaBH<sub>4</sub> CH<sub>3</sub>(CH<sub>2</sub>)<sub>5</sub>CHO
17 Q and R Q and R R only Q and R Q and R R only Q only R only
18 Which compound would undergo nucleophilic addition Ethene, C<sub>2</sub>H<sub>4</sub> Bromoethane, C<sub>2</sub>H<sub>5</sub>Br Ethanal, CH<sub>3</sub>CHO Ethane, C<sub>2</sub>H<sub>6</sub>
19 Ethanal may be converted into a three-carbon acid in a two-step process.
Which compound is the intermediate
 CH<sub>3</sub>CO<sub>2</sub>H CH<sub>3</sub>CN CH<sub>3</sub>CH<sub>2</sub>CN CH<sub>3</sub>CH(OH)CN
20 A compound R has all of the following properties. It is neutral; It gives an orange precipitate with 2,4-dinitrophenythydrazine; it evolves hydrogen chloride when treated with PCI5in the cold What could R be
21 Which compound on reaction with hydrogen cyanide produces a compound with a chiral centre Ch<sub>3</sub>CHO CH<sub>3</sub>CH<sub>2</sub>COCH<sub>2</sub>CH<sub>3</sub> CH<sub>3</sub>CO<sub>2</sub>CH<sub>3</sub> HCHO
22 Aldehydes and ketones are carbonyl compounds. Which of them react both with NaBH4and with Tollen's reagent Both aldehydes and ketones Aldehydes only Ketones only Neither aldehydes nor ketones
23
24 Which alcohol may be oxidised to a product which react with 2,4-dinitorphenylhydrazine reagent but not with Fehling's reagent Butan-1-ol Butan-2-ol 2-methylpropan-1-ol 2-methylpropan-2-ol
25 What is formed when propanone is refluxed with an anhydrous solution of NaBH4 Propanal Propan-1-ol Propan-2-ol Propane
26 In 1903 Arthur Lapeworth became the first chemist to investigate a reaction mechanism. The reaction he investigated was that of hydrogen cyanide with propanone. What do we now call the mechanism of this reaction Electrophilic addition Electrophilic substitution Nucleophilic addition Nucleophilic substitution
27 Compounds X, Y and Z, all react with PCI5to release hydrogen chloride, but only one of them reacts eith 2,4-dinitrophenylhydrazine reagent. Which one of the following combinations could be X, Y and Z
28 Which reagent could be used to distinguish between CH3CH(OH)CH2CHO and CH3COCH2CH2OH Acidified potassium dichromate Dilute sulphuric acid 2,4-dinitrophenylydrazine Fehling's reagent
29 Br<sub>2(aq)</sub> 2, 4-dinitrophenylhydrazine NaBH Tollen's reagent
30 Which isomer of C5H11OH gives, one dehydration, the greastest number of different alkenes
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