General
✓✗Match List I (compound) with List II (use).
Choose the correct answer from the options given below.
| List I | List II |
| P. CHCl3 | I. Antiseptic (earlier) |
| Q. CHI3 | II. Refrigerant |
| R. CCl4 | III. Production of freon R-22 |
| S. CCl2F2 | IV. Fire extinguisher (earlier) |
- P-III, Q-I, R-IV, S-II
- P-I, Q-III, R-IV, S-II
- P-III, Q-I, R-II, S-IV
- P-IV, Q-I, R-III, S-II
General
✓✗A racemic mixture is optically inactive because of
- a plane of symmetry in each molecule
- internal compensation
- the absence of chiral molecules
- external compensation by equal amounts of the two enantiomers
General
✓✗The process of converting an enantiomer into a racemic mixture is called
- racemisation
- inversion only
- isomerisation of bonds
- resolution
General
✓✗Which of the following statements about Grignard reagents are correct?
A. They are prepared in dry ether.
B. They react with water to give alkanes.
C. The C−Mg bond is purely ionic.
D. Their ease of formation from RX follows RI > RBr > RCl.
Choose the correct answer from the options given below.
A. They are prepared in dry ether.
B. They react with water to give alkanes.
C. The C−Mg bond is purely ionic.
D. Their ease of formation from RX follows RI > RBr > RCl.
Choose the correct answer from the options given below.
- A, B and D only
- A, B, C and D
- A and C only
- B and C only
General
✓✗The total number of stereoisomers of 2,3-dichlorobutane is
- 3
- 2
- 4
- 1
General
✓✗Carbon tetrachloride was earlier used as
- an insecticide
- an antiseptic
- a food preservative
- a fire extinguisher
General
✓✗SN1 reactions are favoured by
- gas phase conditions
- polar protic solvents (for example water, alcohols)
- very low temperatures only
- non-polar solvents
General
✓✗An equimolar mixture of two enantiomers is called
- a diastereomer
- a meso compound
- a conformer
- a racemic mixture
General
✓✗The IUPAC name of (CH3)2CHBr is
- 1-bromo-1-methylethane
- 1-bromopropane
- 2-bromopropane
- 2-bromopropene
General
✓✗The Lucas reagent used to convert alcohols into chlorides is
- conc. HCl with anhydrous ZnCl2
- conc. H2SO4 with HCl
- SOCl2 in pyridine only
- PCl5 in ether
General
✓✗The IUPAC name of (CH3)2CHCH2Cl is
- 2-chloro-2-methylpropane
- 2-methyl-3-chloropropane
- 1-chlorobutane
- 1-chloro-2-methylpropane
General
✓✗The correct order of reactivity towards hydrolysis with aqueous NaOH is
- n-propyl chloride > allyl chloride > vinyl chloride
- allyl chloride > n-propyl chloride > vinyl chloride
- vinyl chloride > n-propyl chloride > allyl chloride
- all are equal
General
✓✗Replacement of Cl in chlorobenzene to give phenol requires drastic conditions, but the chlorine of 2,4-dinitrochlorobenzene is readily replaced because
- NO2 withdraws electrons from the ortho and para positions
- NO2 donates electrons at the meta position
- NO2 makes the ring electron rich at the ortho and para positions
- NO2 withdraws electrons from the meta position
General
✓✗Ethanol → (PCl5) A → (alc. KOH, heat) B → (Br2 in CCl4) C. The compound C is
- 1,1-dibromoethane
- 1,2-dibromoethane
- bromoethene
- bromoethane
General
✓✗The number of structural isomers of C3H6Cl2 is
- 4
- 2
- 3
- 5