ECAT Chemistry Online Test With Answers

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ECAT Chemistry Online Test

Sr. # Questions Answers Choice
1 Acetaldehyde is used to make Rubbber Antiseptics Phenolic resin All of these
2 Which reagent will distinguish a ketone from an aldehyde Br<sub>2</sub> 2, 4-dinitrophenylhydrazine NaBH<sub>4</sub> Tollen's reagent
3 During the mechanism of aldol condensation a/an ______ is formed Oxide Alkali Alkoxide ion None of these
4 Which one of the following statement is wrong regarding differences between aldehydes and ketones Aldehydes undergo reduction to form primary alcohols while ketones undergo reduction to form secondary alcohols Aldehydes undergo oxidation to form acids having less number of carbon atoms while ketones undergo oxidation to form acids having same number of carbon atoms Aldehydes give positive silver mirror test while ketones give negative -mirror test Aldehydes can undergo polymerization while ketones cannot undergo polymerizarion
5 Aldol condensation is actually Electrophilic addition of carbonation Electrophilic addition of carbonium ion Nucleophilic addition of carbonation Nuclephilic addition of carbonium ion
6 Aldehydes is distinguished from ketones by using Tollen's reagent Benedict reagent Fehling solution All of the above
7 In aldol condensation reaction, a double bond is formed between ______ and ______ carbon atoms <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>and<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> <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>and<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> <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>and Y None of these
8 Silver mirror test is applied for Aldehydes Alcohols Acids Esters
9 Cannizzaro's reaction in not given by Formaldehyde Acetaldehyde Benzaldyhyde Trimethylacetaldehyde
10 The base used in Cannizzaro's reaction is NaOH KOH CHI<sub>3</sub> All of these
11 Acetone reacts with HCN to form a cyanohydrin. It is an example of Electrophilic addition Electrophilic substitution Nucleophilic addition Nucleophilic substitution
12 Ketons are prepared by the oxidation of Primary alcohol Secondary alcohol Tertiary alcohol None of these
13 Formaline Contains ______% alcohol 80 37 8 52
14 Formaldehyde is used to make Plastics Medicine Antiseptic All of these
15 A food chemist wants to create the odour of pineapples for a product. An ester with this odour has the formula C3H7COOC2H5.Which pair of reagents would produce this ester C<sub>2</sub>H<sub>5</sub>CI and C<sub>3</sub>H<sub>7</sub>COOH C<sub>2</sub>H<sub>5</sub>OH and C<sub>3</sub>H<sub>7</sub>CONH<sub>2</sub> C<sub>2</sub>H<sub>5</sub>OH and C<sub>3</sub>H<sub>7</sub>COOH C<sub>3</sub>H<sub>7</sub>OH and C<sub>2</sub>H<sub>5</sub>COCI
16 Which one of the following is a product of the reaction between C6H5CH2OH and CH3COCI C<sub>6</sub>H<sub>5</sub>OCOCH<sub>3</sub> C<sub>6</sub>H<sub>5</sub>CH<sub>2</sub>CI C<sub>6</sub>H<sub>5</sub>CH<sub>2</sub>OCOCH<sub>3</sub> C<sub>6</sub>H<sub>5</sub>CH<sub>2</sub>COCI
17 The color of ppts formed by Fehling's test is Brick red Red Yellow Orange
18 An organic compound has the following properties ; It gives a positive tri-iodomethane test; it gives a yellow ppt, with 2, 4-DNP regent; it does not react with Tollen's reagent . Which compound would give these results CH<sub>3</sub>CHO CH<sub>3</sub>CH<sub>2</sub>OH CH<sub>3</sub>CH<sub>2</sub>COCH<sub>3</sub> CH<sub>3</sub>CH<sub>2</sub>CH<sub>2</sub>CHO
19 The product of the reaction between propanone and HCN is hydrolysed under acidic conditions. What is the formula of the final product CH<sub>3</sub>CH(OH)COOH CH<sub>3</sub>CH<sub>2</sub>CH(OH)COOH (CH<sub>3</sub>)<sub>2</sub>C(OH)COOH CH<sub>3</sub>CH<sub>2</sub>CH<sub>2</sub>COOH
20 Aldehydes which do not haveα-hydrogen undergo Aldol combination Cannizzaro's reaction Substitution Elimination
21 For which one of the following pairs of compounds can the members be distinguished by means of Tollen's test HCHO and CH<sub>3</sub>CHO CH<sub>3</sub>CHO and CH<sub>3</sub>COCH CH<sub>3</sub>COCH<sub>3</sub>and C<sub>6</sub>H<sub>5</sub>COCH<sub>3</sub> CH<sub>3</sub>COOH and CH<sub>3</sub>COOCH<sub>3</sub>
22 On adding sodium nitroprusside ketones give Red Wine red White Orange
23 Which one of the following reagents will distinguish between C6H5CHO and C6H5COCH3 Aqueous bromine Phosphorus pentachloride 2, 4 DNPH Tollen's reagent
24 Aldelydes are the oxidation product of P-alcohols s-alcohols ter-alcohols carboxylic acids
25 The color of ppts formed by Benedirct's test is Brick red Wine red Yellow Orange
26 Which of the following compounds will react with Tollen's reagent
27 The catalytic prmoter used for the industrial preparation of acetaldehyde is PdCI<sub>2</sub> CuCI<sub>2</sub> Pd + CaCI<sub>2</sub> None of these
28 Acetone reacts with HCN to form a cyanohydrin. It is an example of Electrophilic addition Electrophilic substitution Nucleophilic addition Nucleophilic substitution
29 Ketones are prepared by the oxidation of Primary alcohol Secondary alcohol Tertiary alcohol None of these
30 Which of the following will have the highest boiling point Methanol Ethanol Propanal 2-hexanone
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