General
✓✗Alkenes generally undergo
- electrophilic addition reactions
- free-radical substitution only
- electrophilic substitution reactions
- nucleophilic substitution reactions
General
✓✗Which of the following alkenes has a zero dipole moment?
- 1,1-Dichloroethene
- trans-1,2-Dichloroethene
- cis-1,2-Dichloroethene
- Chloroethene
General
✓✗In which of the following molecules can all the atoms lie in one plane?
- Cyclohexane
- Bicyclohexyl (C6H11−C6H11)
- (CH3)2C=C(CN)2
- Biphenyl (C6H5−C6H5)
General
✓✗Hydration of ethyne in the presence of HgSO4/H2SO4 gives ethanal through the intermediate
- ethylene glycol
- vinyl alcohol (ethenol)
- diethyl ether
- ethanol
General
✓✗Propyne, CH3−C≡CH, on passing through a red-hot iron tube at 873 K gives product A. The number of sigma (σ) bonds present in A is
- 18
- 24
- 9
- 21
General
✓✗The number of geometrical isomers of but-2-ene is
- 4
- 3
- 2
- 1
General
✓✗Ethyne reacts with sodium metal to liberate
- ethane
- hydrogen gas
- methane
- oxygen
General
✓✗Which of the following reagents will be able to distinguish between but-1-yne and but-2-yne?
- O2
- HCl
- Br2
- NaNH2
General
✓✗The first step in the mechanism of electrophilic substitution of benzene is
- loss of a proton
- attack of a nucleophile
- formation of a free radical
- generation of the electrophile
General
✓✗Sulphonation of benzene is carried out with
- fuming sulphuric acid (oleum)
- sodium sulphite
- dilute H2SO4
- SO2 gas
General
✓✗In the Sawhorse projection, the C−C bond of ethane is drawn
- as a point with a circle around it
- as two dots
- as a wedge only
- as a long diagonal line viewed from an angle
General
✓✗Benzene is treated with propan-1-yl chloride (n-propyl chloride) and anhydrous AlCl3. The major product is
- n-propylbenzene
- cumene (isopropylbenzene)
- ethylbenzene
- toluene
General
✓✗With respect to the conformers of ethane, which of the following statements is true?
- Both bond angle and bond length remain the same
- Both bond angle and bond length change
- Bond angle remains the same but bond length changes
- Bond angle changes but bond length remains the same
General
✓✗An alkene on ozonolysis gives only propanone. The alkene is
- 2-methylbut-2-ene
- 2-methylpropene
- but-2-ene
- 2,3-dimethylbut-2-ene
General
✓✗Friedel−Crafts reactions do not occur with nitrobenzene because
- the NO2 group strongly deactivates the ring
- nitrobenzene is a gas
- nitrobenzene has no hydrogen
- nitrobenzene reacts with AlCl3 to form benzene