MCQOPTIONS
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MCQOPTIONS
This section includes 2539 Mcqs, each offering curated multiple-choice questions to sharpen your Current Affairs knowledge and support exam preparation. Choose a topic below to get started.
| 101. |
From the followings, which drug contain furan heterocyclic ring? |
| A. | Furazolidine |
| B. | Nitrofurantoin |
| C. | Fluticazone |
| D. | All of the above |
| Answer» E. | |
| 102. |
Which of the following is NOT true of enantiomers? They have the same: |
| A. | boiling point. |
| B. | melting point. |
| C. | specific rotation. |
| D. | chemical reactivity toward achiral reagents. |
| Answer» E. | |
| 103. |
Which drug(s) contain thiophene ring in its(their) structure? |
| A. | Cephalothin |
| B. | Cefoxitin |
| C. | Temocillin |
| D. | All of the above |
| Answer» E. | |
| 104. |
Clotiazepam, CNS active agent, possess __________ heterocyclic ring. |
| A. | Thiophene |
| B. | Oxazole |
| C. | Pyridine |
| D. | Pyrrole |
| Answer» B. Oxazole | |
| 105. |
Identify the given heterocyclic compound. |
| A. | Furan |
| B. | Pyrazole |
| C. | Pyrrole |
| D. | Pyridine |
| Answer» D. Pyridine | |
| 106. |
A solution of 0.1 g/mL of a pure R enantiomer in a 1.0 dm (i.e., 10 cm) polarimeter rotates plane polarized light by +4.8°. What is the rotation observed on this solution in a 2 dm polarimeter? |
| A. | +2.4° |
| B. | +4.8° |
| C. | +19° |
| D. | +9.6° |
| Answer» E. | |
| 107. |
Which of the statements below correctly describes an achiral molecule? |
| A. | The molecule has a nonsuperimposable mirror image. |
| B. | The molecule exhibits optical activity when it interacts with plane-polarized light. |
| C. | The molecule has an enantiomer. |
| D. | The molecule might be a meso form. |
| Answer» E. | |
| 108. |
Which would be the intermediate in the following reaction? |
| A. | Furan – 2 carboxide |
| B. | Furan- 2 – carbinol |
| C. | Furoic acid |
| D. | None of the above |
| Answer» D. None of the above | |
| 109. |
Absolute configuration of stereoisomer is denoted by__ |
| A. | R and S isomers |
| B. | D and L isomers |
| C. | d and l isomers |
| D. | cis and tr |
| Answer» B. D and L isomers | |
| 110. |
Which of the following statements correctly pertains to a pair of enantiomers? |
| A. | They rotate the plane of polarized light by exactly the same amount and in opposite directions. |
| B. | They rotate the plane of polarized light by differing amounts and in opposite directions. |
| C. | They rotate the plane of polarized light by differing amounts and in the same direction. |
| D. | They have different melting points. |
| Answer» B. They rotate the plane of polarized light by differing amounts and in opposite directions. | |
| 111. |
Which of the following groups has the highest priority according to the Cahn-Ingold-Prelogsequence rules? |
| A. | CH3 |
| B. | CH2Cl |
| C. | CH2OH |
| D. | CHO |
| Answer» E. | |
| 112. |
How many stereoisomers of 3-bromo-2-butanol, CH3CH(OH)CHBrCH3, exist? |
| A. | 3 |
| B. | 1 |
| C. | 2 |
| D. | 4 |
| Answer» E. | |
| 113. |
The hydrogens lying in the plane of the cyclohexane ring are called____ |
| A. | Axial hydrogens |
| B. | Chiral hydrogens |
| C. | Equatorial hydrogens |
| D. | None of the above |
| Answer» D. None of the above | |
| 114. |
Which is the most reactive five membered heterocyclic compound? |
| A. | Pyrrole |
| B. | Furan |
| C. | Thiophene |
| D. | Pyridine |
| Answer» B. Furan | |
| 115. |
(2R,4S) –2,4–Dichloropentane and (2S,4R)-2,4-dichloropentane are: |
| A. | Enantiomers |
| B. | Diastereomers |
| C. | identical |
| D. | conformational isomers |
| Answer» D. conformational isomers | |
| 116. |
Which of the following statements is (are) true for the compound cis-1,2-dichlorocyclopropane? |
| A. | This compound is chiral. |
| B. | The enantiomer of this compound is trans-1,2-dichlorocyclopropane. |
| C. | This compound contains no asymmetric carbons. |
| D. | none of the above |
| Answer» E. | |
| 117. |
Catalytic reduction of furan gives______ |
| A. | 2,3 – dihydro furan |
| B. | 2,5 – dihydro furan |
| C. | Tetra hydro furan |
| D. | 3,4 – dihydro furan |
| Answer» D. 3,4 – dihydro furan | |
| 118. |
Identify the following reaction: |
| A. | Cannizaro reaction |
| B. | Benzoin condensation |
| C. | Gomberg reaction |
| D. | Mercuration |
| Answer» B. Benzoin condensation | |
| 119. |
How many different compounds are there which correspond to the general name "3-(1-methylbutyl) cyclobutanol”? |
| A. | 2 |
| B. | 4 |
| C. | 6 |
| D. | 8 |
| Answer» C. 6 | |
| 120. |
What can be said with certainty if a compound has [!] D/25 = -9.25º ? |
| A. | The compound has the (S) configuration. |
| B. | The compound has the (R) configuration. |
| C. | The compound is not a meso form. |
| D. | The compound possesses only one stereogenic center. |
| Answer» D. The compound possesses only one stereogenic center. | |
| 121. |
CH3CHBrCH2CHClCH3 is the generalized representation of what number of stereo isomers? |
| A. | 3 |
| B. | 4 |
| C. | 5 |
| D. | 6 |
| Answer» C. 5 | |
| 122. |
What is the name of the following reaction? |
| A. | Gattermann reaction |
| B. | Riemer tiemann reaction |
| C. | Friedal craft reaction |
| D. | Blanc’s chloromethylation |
| Answer» B. Riemer tiemann reaction | |
| 123. |
Pyrrole probably undergoes to ___________ reaction. |
| A. | Electrophilic substitution |
| B. | Nucleophilic substitution |
| C. | Electrophilic addition |
| D. | Nucleophilic addition |
| Answer» B. Nucleophilic substitution | |
| 124. |
Identify the reaction: when furan react with aryl diazonium chloride in the presence ofstrong alkali to produce 2 – aryl furan. |
| A. | Mercuration |
| B. | Gattermann Koch reaction |
| C. | Kolbe reaction |
| D. | Gomberg reaction |
| Answer» E. | |
| 125. |
Thiophene shows electrophilic substitution reactions mainly at position___. |
| A. | C2 |
| B. | C3 |
| C. | C4 |
| D. | C5 |
| Answer» B. C3 | |
| 126. |
Which condition is appropriate for the nitration of thiophene? |
| A. | Acetyl nitrate |
| B. | Nitric acid +acetic anhydride |
| C. | Concentrated nitric acid |
| D. | Sodium nitrate |
| Answer» C. Concentrated nitric acid | |
| 127. |
What is the percent composition of a mixture of (S)-(+)-2-butanol, α= +13.52°, and (R)-(-)-2-butanol, α = -13.52°, with a specific rotation α = +6.76°? |
| A. | 75%(R) 25%(S) |
| B. | 25%(R) 75%(S) |
| C. | 50%(R) 50%(S) |
| D. | 67%(R) 33%(S) |
| Answer» B. 25%(R) 75%(S) | |
| 128. |
The hydrogens lying above or below the plane of the cyclohexane ring are called____ |
| A. | Axial hydrogens |
| B. | Chiral hydrogens |
| C. | Equatorial hydrogens |
| D. | None of the above |
| Answer» B. Chiral hydrogens | |
| 129. |
Relative configuration of stereoisomer is denoted by__ |
| A. | R and S isomers |
| B. | D and L isomers |
| C. | d and l isomers |
| D. | cis and tr |
| Answer» B. D and L isomers | |
| 130. |
Sulfonation of thiophene can be carried out by using______________. |
| A. | SO3 +Conc. HCl |
| B. | Dilute Sulphuric acid |
| C. | Concentrated Sulphuric acid |
| D. | SO3 + HNO3 |
| Answer» D. SO3 + HNO3 | |
| 131. |
Which is the following heterocyclic compound? |
| A. | Thiophene |
| B. | Thiazole |
| C. | Furan |
| D. | Pyrrole |
| Answer» B. Thiazole | |
| 132. |
The process of separation of a racemic mixture into optically active d and l isomers is___ |
| A. | Racemization |
| B. | Resolution |
| C. | Both (a) and (b) |
| D. | None of the above |
| Answer» C. Both (a) and (b) | |
| 133. |
Which is the true sentence for stereospecific reactions from the followings, |
| A. | Reactants react at different rate i.e. they have different rate of reaction. |
| B. | They give different stereoisomers as products. |
| C. | They have different paths to give different types of compounds as products. |
| D. | All of the above |
| Answer» E. | |
| 134. |
What term describes the structural relationship between (E)- and (Z)-2-pentene? |
| A. | Constitutional isomers |
| B. | Enantiomers |
| C. | Geometric isomers |
| D. | Conformers |
| Answer» D. Conformers | |
| 135. |
Complete the reaction: |
| A. | Br2 |
| B. | HBr |
| C. | KBr in alcohol |
| D. | NaBr in pyridine |
| Answer» B. HBr | |
| 136. |
What can be said with certainty if a compound has α= -9.25°? |
| A. | The compound has the (S) configuration |
| B. | The compound has the (R) configuration |
| C. | The compound is not a meso form |
| D. | The compound possesses only one stereogenic center |
| Answer» D. The compound possesses only one stereogenic center | |
| 137. |
What would be the appropriate reaction condition for the following reaction; |
| A. | SO2/AlCl3/673K |
| B. | H2S/AlCl3/273K |
| C. | H2S/Al2O3/673K |
| D. | Sulphur/heat |
| Answer» D. Sulphur/heat | |
| 138. |
Thiophene & its derivatives show following pharmacological activity. |
| A. | Sedative |
| B. | Hypnotic |
| C. | Anticonvulsant activity |
| D. | All of the above |
| Answer» E. | |
| 139. |
How many possible stereoisomers for the compound CH3CH(OH)COOH. |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 140. |
Which of the following molecules is achiral? |
| A. | (2R,3R)-2,3-Dichloropentane |
| B. | (2R,3S)-2,3-Dichloropentane |
| C. | (2S,4S)-2,4-Dichloropentane |
| D. | (2S,4R)-2,4-Dichloropentane |
| Answer» E. | |
| 141. |
In the absence of specific data, it can only be said that (R)–2–bromopentane is: |
| A. | dextrorotatory (+). |
| B. | levorotatory (–). |
| C. | analogous in absolute configuration to (R)–2–bromopentane. |
| D. | optically inactive. |
| Answer» D. optically inactive. | |
| 142. |
Which of the followings statements is correct? |
| A. | Pyrrole has less aromatic character than furan |
| B. | Pyridine is isoelectronic with benzene |
| C. | Pyridine is tertiary amine |
| D. | Pyrrole is strong base |
| Answer» D. Pyrrole is strong base | |
| 143. |
A mixture of equal amounts of two enantiomers __________. |
| A. | is called a racemic mixture |
| B. | is optically inactive |
| C. | implies that the enantiomers are meso forms |
| D. | both A and B |
| Answer» E. | |
| 144. |
Which of these is a comparatively insignificant factor affecting the magnitude of specific optical rotation. |
| A. | Concentration of substance of interest |
| B. | Temperature of measurement |
| C. | Length of the sample tube |
| D. | All of the above |
| Answer» E. | |
| 145. |
Which symmetry element makes the given compound achiral? |
| A. | Plane of symmetry (POS) |
| B. | Center of symmetry (COS) |
| C. | Axis of symmetry (AOS) |
| D. | Alternating axis of symmetry (AAOS) |
| Answer» B. Center of symmetry (COS) | |
| 146. |
Prazocin, sympatholytic drug contain__________heterocyclic ring. |
| A. | Furan |
| B. | Pyrrole |
| C. | Oxazole |
| D. | Indole |
| Answer» B. Pyrrole | |
| 147. |
What will be the product of the following reaction? |
| A. | 5 – bromo thiophene |
| B. | 3- bromo thiophene |
| C. | 2 – bromo thiophene |
| D. | 2,5 – di bromo thiophene |
| Answer» D. 2,5 – di bromo thiophene | |
| 148. |
Five membered rings come under which category of heterocycle classification on the basisof chemical behavior? |
| A. | -excessive heterocycle |
| B. | -deficient heterocycle |
| C. | -equivalent heterocycle |
| D. | Can’t say about the five membered rings |
| Answer» B. -deficient heterocycle | |
| 149. |
Which of the following terms correctly describe(s) the structural relationship between cis-1,3- dimethylcyclopentane and trans-1,3-dimethylcyclopentane? |
| A. | enantiomers |
| B. | diastereomers |
| C. | geometric isomers |
| D. | both B and C |
| Answer» E. | |
| 150. |
What would be the product of following reaction? |
| A. | Thiophene |
| B. | Thiazole |
| C. | Purine |
| D. | Pyrimidine |
| Answer» B. Thiazole | |