PPSC Chemistry Full Book Test With Answers

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PPSC Chemistry Full Book Test

Sr. # Questions Answers Choice
1 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
2 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
3 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
4 The number of optically active compounds in the isomers of C3H5Br3 is. 1 2 3 4
5 The reagent which can react with 1- chlorobutane to give substitution product is Al Cl3 KOH -CH3OH NaCN Mg/ether
6 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 The chlorine atom has been replaced by a bromine atom The bromine is mor esoluble in chlorobenzene than in water A hydrogen atom has been replaced by a bromine atom
7 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
8 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
9 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
10 Among the following a good solvent for a Grignard reagent formation would be. t- butanol dimethyl ether difiuoro ethane tetrahyudroform
11 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
12 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
13 Alkaline hydrolysis of chloroform produces. HCCO HCOO - + CO H3COH CHCL2 OH
14 Which of the following alkyl halide undergoes nucleophilic substitution reaction via the formation of a carboncation. 1-chloro -2 methyl propane 2- chlro-2-methyl propane 2- chloro butane 1-Chloro, 3,3- dimethyl pentane
15 When alkyl iodidies are decomposed by light then the product obtained is. R - R R - H RCH2I RCHI2
16 Iodination of benzene takes place in the presence of iodine and HNO3 HIO3 HgO All of these
17 Chlorination of benzene with excess chlorine in the presence of FeCl3 as Lewis acid gives. Chlorobenzene as a major product o-dichlorobenzene as major product p-dichloro benzene as an only product A mixture of 0- and p- dichloro benzene
18 An optically active compound <sub>Must contain at least favour carbons</sub> When in solution rotate the plane of polarized light Most always contain an asymmetric carbon atom In solution always give negative reading in polarimetre
19 A molecule is said to be chiral If it contains plane of symmetry If it contains centre of symmetry If it can be superimposed on its mirror image None of the above
20 Plane polarized light is affected by Identical molecules All polymers Chiral molecules All biomolecules
21 It is possible to distinguish between optical isomers. Using chemical tests By mass spectrometry By IR spectroscopy By polarimetry
22 Enantiomers have which of the following characteristics. Rotate ordinary light Have the same melting point Are superimposable mirror images React with optically active molecule at the same rate
23 Which of the following statements is false about enantiomers. Rotate plane of polarized light Are superimposable mirror images Nbonsuperimposable mirror images All of the above
24 What is the possible number of optical isomers for a compound contained 2 dissimilar asymmetric carbon atoms. 2 4 6 8
25 Which of the following compound will be optically active. Suceinic acid Meso tartaric acid Acetic acid Lactic acid
26 2- Butanol is optically active because a contains An asymmetric carbon atom A plane of symmetry Centre of symmetry A hydroxyl group
27 Lactic acid is a molecule which shows Epimersim Tautomerism Opical isomerism Metamerism
28 Process of separating the racemic mixture into optically active isomers is known as. Resolution Racemisation Walden inversion Epimerization
29 How many stereoisomers are possible for CH3CH = CHCHCH(Br) CH3 2- geometrical isomers 2- optical isomers 2- geometricla nad 2- optical isomers 2- geometrical and 1 optical isomers
30 According to R, S system the correct order of priority of the following groups is . -CH2OH &gt; - CHO &gt; ----- COOH -COOH &gt; ------CHO &gt; ------CH2OH ---- CH2OH -----&gt; - COOH &gt; -------CHO --- COOH &gt; - CH2OH &gt;----- CHO
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