PPSC Chemistry Part II Organic Chemistry Online Test With Answers

PPSC Chemistry Part II Organic Chemistry Online Test

Sr. # Questions Answers Choice
1
An aromatic compound has a molecules formula C7H8O. How many isomers are possible for this compound.
 3 4 5 6
2 Which of the following reagent cannot be used to detect the phenolic group. Neutral FeCl3 I2/NaOH NaOH solution Br2/H2O
3 An organic liquid (X) containing C, H and H has a pleasent odour with a boiling point of 78 oC. On boiling X with conc. H2SO4 a colourless gas is produced which decolourless bromine water and alkaline KMnO4 One mole of this gas also takes one mole of H2. The organic liquid (X) is. n-C3H7OH iso-C3H7OH C2H5CHO CH3CH2OH
4 In which of the following group, each member given a positive iodoform test. Methanol, ethanol, propanone Ethanol, isopropyl alcohol, methanol Ethanol, ethanal, isopropyl alcohol Propanal 2-propanol, propanone
5 The reason why phenylamine is a much weaker base tahn ammonia when each is in aqueous solution to that. Teh ion pair of electron on two nitrogen atom of phenylamine is delocalised over the benzene ring. The phenylamine molecule is too large to capture hydrogen ion easily Phenylamine is much less soluble is water than is ammonia The benzene ring has a tendency to increase the acidity of its substituents.
6 Which of the following compounds would you use in order to obtain a crystalline derivative of an aromatic amine. 2,4 Dinitrophenyl hydrazine Nitrous acid Benzoyl chlride None of these
7 Carbylamine reaction proceeds via the intermediate formation of. Alkyl isocyanide Chloride ion Alkyl carbonion Dichloro methylene
8 The reagent which can be used to distinguish acetophenone from benzophenone is. 2,4 -dinito phenyl hydrazine Li AIH4 Benedict reagetn I2 and Na2CO3
9 The condensation between formaldehyde and acetaldehyde in the presence of conc. NaOH and heat gives. Acrolein Mixture of CH3OH and CH3COO Na. Mixture of CH3CH2OH and HCOO - Na+ None of these
10 Which of the following pair on aldol condensation followed by dehydration gives methyl vinyl ketone. HCHO and CH3COCH3 HCHO and CH3CHO CH3CHO and CH3CHO CH3COCH3 and CH3COCH3
11 Select the major product obtained from the addition of HBr to I -Methyl cyclohexene 1-bromo -2- methyl cyclohexane 6- bromo-i- methyl cyclohex -i- ene 3- bromo -1- methyl cyclohex - 1- ene I-bromo -I- methyl cyclohexane
12 The number of optically active compounds in the isomers of C3H5Br3 is. 1 2 3 4
13 The reagent which can react with 1- chlorobutane to give substitution product is Al Cl3 KOH -CH3OH NaCN Mg/ether
14 When the colourless liquid chlorobenzene is shaken with bromine water, the chlorobenzen becomes a yellow-orange colour. Which of the following is the best interpretation of this. An addition compound of chlorobenzene and bromine has been formed. The chlorine atom has been replaced by a bromine atom The bromine is mor esoluble in chlorobenzene than in water A hydrogen atom has been replaced by a bromine atom
15 For which of the following compounds is the rate of hydrolysis by aqueous alkali most likely to be independent of the hydroxide ion concentration. 1-Chlorobutane 2- Bromobutane 1- Iodobutane 2- Bromo -2- methyl butane
16 Which one of the following woul dmake an SN2 mechanism more likely Bulky substituents near the halogen A polar solvent A tertiary carbocation intermediate A reactive nucleophile
17 Select the major product obtained from the addition HBr to 1-methyl cyclohexene. 1- bromo -2- methyl cyclohexane 6- bromo-1- methyl cyclohex - 1- ene 3- bromo-1- methyl cyclohex -1- ene 1- bromo-1- methyl cyclohexane
18 Among the following a good solvent for a Grignard reagent formation would be. t- butanol dimethyl ether difiuoro ethane tetrahyudroform
19 A salt solution is treated with chloroform drops.Then it is shaken with chlorine water, chloroform layer become violet solution contains. NO2 ion NO3 ion Br ion I- ion
20 Aromatic amine (X) was treated with alcoholic potash and another compound (Y) when foul smelling gas was formed with formula C2H3N (Y) was formed by reacting a compound (Z) with Cl2 in the presence of slaked lime . The compound (Z) is C6H5NC CHCl3 CH3CH2OH C6H5NH2
Download This Set

Is this page helpful?