PPSC Chemistry Part II Organic Chemistry Online Test With Answers

PPSC Chemistry Part II Organic Chemistry Online Test

Sr. # Questions Answers Choice
1 Sugar and common salt in a mixture can be separated through then process of. Sublimation Distillation Ion exchange Crystallization from solution in ethanol
2 Recrystallization is the most common technique of purification of solid organic substances Which of the following statements is not related with characteristics of a suitable solvent. It dissolves the substance on heating It readily allows it to separate out in the form of crystal on cooling It does not react chemically with substance It does dissolve the impurities.
3 Which of the following techniques is involved in purification of organic compound. Distillation Sublimation Solvent extraction All above
4 When of the following steps is involved in structure determination of an organic compound. Purification of compund. Qualitative and quantitative analysis of elements present Determination of molar mass All above steps
5 Which of the following compounds has highest dipole moment. Dichloromethane Chloroform Chloromathane All above
6 The most stable carbonium ion is See butyl n-butyl Tert butyl None of the above
7 Which of the following statement is false about resonance. It increase the stability of a molecule It leads to similar type of bonds It increase the reactivity of the molecule It decrease the reactivity of the molecule.
8 Which statement is true. Resonance hybride are inherently unstable. Resonance hybride are more static than any individual resonance form Resonance hybride are average of all resoance forms resembling the more stabel forms None of the above
9 The bond length of C = C is 1.20 A<sup>o</sup> 1.34 A<sup>o</sup> 1.54 A<sup>o</sup> 1.68 A<sup>o</sup>
10 The bond angle between hybrid orbitals in methane is 115.5<sup>o</sup> 109.5<sup>o</sup> 105,7<sup>o</sup> 120<sup>o</sup>
11 Which of the following is a planar molecule. Acetone Formic acid Acetic acid All above
12 The greater stability of bonzyl carbonium ion as compared to t-butyl carbonium ion is due to. Inductive effect Resonance effect Electrometric effect All above
13 All bond length in benzene are identical due to. Resonance effect Inductomeric effect Electromeric effect Mesomeric effect
14 Trimethylamine is a weaker base than dimethylamine is explained by Steric effct Resonance effect Inductive effect All above
15 Which of the following effects best explains that o-nitro phenol is insoluble in water. Inductive effect Resonance effect Intramolecular H -bonding Isomeric effect
16 Which of the following is most acidic. Phenol p-nitrophenol o-Nitrophenol m-Nitrophenol
17 Which of the following is most basic. Aniline Benzylamine Diphenylamine N-methylaniline
18 Which of the following group will have hyper conjugation effect when attached to benzene. ------ CH3 ----C6H5 ------C(CH3)3 ---------CH(CH3)2
19 Chlorine when attached to benzene has +1 and + R effect -1 and - R effect -1 and +R effect None of the above
20 C - O bond lengths in carboxylate anion are equal due to. Resonance effect Inductive effect Resonance of identical contributing structures. Hyperconjugation
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