ECAT Chemistry MCQ's Test For Full Book With Answers

ECAT Chemistry MCQ's Test For Full Book

Sr. # Questions Answers Choice
1 All are ortho & Para directing except X OH NR<sub>3</sub> NH<sub>2</sub>
2 The difference between amount of heat actually released and that of calculated is called Bonding energy Activation energy Resonance energy Transition energy
3 The three alternate single and double bonds in the benzene ring are called Conjugate bonds Resonating bonds Both A and B None of above
4 The nitration of benzene takes place when it is heated with a mixture of conc.HNO3and conc. H2SO4at 50°C in ratio of 1 : 2 1 : 1 1 : 3 2 : 1
5 The electrophile in aromatic sulphonation is H<sub>2</sub>SO<sub>4</sub> HSO<sub>4</sub> SO<sub>3</sub> SO<sub>3</sub><sup>+</sup>
6 Which one of the following is (m-xylene) 1,2 dimethyl benzene 1,3 dimethyl benzene 1,5 dimethyl benzene 1,4 dimethyl benzene
7 Benzene has a -------- structure Pentagonal Hexagonal Heptagonal Tetragonal
8 Which of the following acid can be used as a catalyst in Friedal Craft's reactions AlCl<sub>3</sub> HNO<sub>3</sub> BeCl<sub>2</sub> NaCl
9 Benzene does not undergo polymerization and it is also resistant to Reduction Oxidation Alkylation Ozonolysis
10 Which class of compound is more reactive Alkane Alkene Alkyne None
11 Meta directing group decreased the ----------- of benzene ring Physical activity Chemical reactivity Density None
12 The electron releasing effect of methyl group is significant and it makes ring a good Electrophilic Nucleophilic Nucleophobic Hydrophobic
13 How many isomeric disubtituted products are obtained by the introducing of second group in the ring Two Three Four None
14 Alkyl benzenes are readily oxidized by axidfied KMnO<sub>4</sub> K<sub>2</sub>CO<sub>3</sub> MnO<sub>4</sub> H<sub>2</sub>SO<sub>4</sub>
15 Benzene reacts with ozone and gives Glycerin Glyoxal Maleic anhydride Benzoic acid
16 When benzene is burnt in free supply of air, it is completely oxidized to CO CO<sub>2</sub><sub>+</sub>H<sub>2</sub>O H<sub>2</sub>CO<sub>3</sub> None
17 Sulphuric acid generates nitronium ion by reacting with Nitric acid Nitrogen gas Nitrous acid Potassium nitrate
18 Which reaction is too vigorous to control Chlorination Bromination Iodination Fluorination
19 Benzene is obtained from benzene sulphonic acid by treating with HCl NaOH H<sub>2</sub>O NaHCO<sub>3</sub>
20 Benzene is not prepared from Acetylene Phenol Benzoic acid Bromo benzene
21 The stability of acromatic compounds decreases with ------- in the no. of its resonance structure Decrease Increase Remain constant Partially decreases
22 Hybridization of each carbon atom in benzene ring is sp hybridized sp<sup>2</sup>hybridized sp<sup>3</sup> dsp<sup>2</sup>
23 A six membered ring containing one double bond called Cyclohexene Cyclohexane Cyclohexadiene None
24 All C - H bond lengths of benzene ring is 1.07A<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span> 1.09A<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span> 1.08A<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span> None
25 The C-C bond angles in benzene ring are 119<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span> 120<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span> 121<span style="color: rgb(84, 84, 84); font-family: arial, sans-serif; font-size: small;">°</span> None
26 How many molecules of chlorine adds in benzene in the presence of sunlight One Two Three Four
27 The empirical formula of benzene is determined by IR spectra U.V Elemental analysis NMR spectra
28 Benzene was discovered by Michael Faraday's in 1824 1825 1826 1827
29 Substituted phenyl groups are called acyl groups phenyl groups Aryl groups Alkyle groups
30 Toluene is also called Hydroxyl benzene Methyl benzene ethyl benzene None
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