ECAT Chemistry Chapter 19 Aliphatic Hydrocarbons Online Test With Answers

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ECAT Chemistry Chapter 19 Aliphatic Hydrocarbons Online Test

Sr. # Questions Answers Choice
1 When alkyl is treated with chlorine in the presence of sunlight 1,3 dichloroproduct is formed 1,4 dichloro product is formed 1,3,5 trichloro product is formed Only alkyl group is substituted
2 Which one does not declourized KMnO4 Alkenes Alkynes Bezene All above
3 Substitution of halogen in the benzene ring requires catalyst AlCl<sub>3</sub> FeCl<sub>3</sub> SiO<sub>2</sub> Organo - nickel
4 All are ortho & Para directing except X OH NR<sub>3</sub> NH<sub>2</sub>
5 The difference between amount of heat actually released and that of calculated is called Bonding energy Activation energy Resonance energy Transition energy
6 The three alternate single and double bonds in the benzene ring are called Conjugate bonds Resonating bonds Both A and B None of above
7 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
8 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>
9 Which one of the following is (m-xylene) 1,2 dimethyl benzene 1,3 dimethyl benzene 1,5 dimethyl benzene 1,4 dimethyl benzene
10 Benzene has a -------- structure Pentagonal Hexagonal Heptagonal Tetragonal
11 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
12 Benzene does not undergo polymerization and it is also resistant to Reduction Oxidation Alkylation Ozonolysis
13 Which class of compound is more reactive Alkane Alkene Alkyne None
14 Meta directing group decreased the ----------- of benzene ring Physical activity Chemical reactivity Density None
15 The electron releasing effect of methyl group is significant and it makes ring a good Electrophilic Nucleophilic Nucleophobic Hydrophobic
16 How many isomeric disubtituted products are obtained by the introducing of second group in the ring Two Three Four None
17 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>
18 Benzene reacts with ozone and gives Glycerin Glyoxal Maleic anhydride Benzoic acid
19 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
20 Sulphuric acid generates nitronium ion by reacting with Nitric acid Nitrogen gas Nitrous acid Potassium nitrate
21 Which reaction is too vigorous to control Chlorination Bromination Iodination Fluorination
22 Benzene is obtained from benzene sulphonic acid by treating with HCl NaOH H<sub>2</sub>O NaHCO<sub>3</sub>
23 Benzene is not prepared from Acetylene Phenol Benzoic acid Bromo benzene
24 The stability of acromatic compounds decreases with ------- in the no. of its resonance structure Decrease Increase Remain constant Partially decreases
25 Hybridization of each carbon atom in benzene ring is sp hybridized sp<sup>2</sup>hybridized sp<sup>3</sup> dsp<sup>2</sup>
26 A six membered ring containing one double bond called Cyclohexene Cyclohexane Cyclohexadiene None
27 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
28 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
29 How many molecules of chlorine adds in benzene in the presence of sunlight One Two Three Four
30 The empirical formula of benzene is determined by IR spectra U.V Elemental analysis NMR spectra
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