General
✓✗Among the following, the most stable carbanion is
- C−H3
- CH3−C−H2
- O2N−C−H2
- (CH3)2C−H
General
✓✗In Lassaigne’s test for sulphur, the extract acidified with acetic acid gives a black precipitate with
- ferric chloride
- lead acetate
- silver nitrate
- sodium nitroprusside
General
✓✗The IUPAC name of CH3−C(CH3)2−OH is
- tert-butanol (IUPAC)
- butan-2-ol
- 2,2-dimethylethanol
- 2-methylpropan-2-ol
General
✓✗The number of σ and π bonds in CH2=CH−CN (acrylonitrile) are respectively
- 6 and 2
- 5 and 3
- 6 and 3
- 7 and 2
General
✓✗Which of the following IUPAC names is incorrect?
- CH3−CH(CH3)−CH(CH2CH3)−CH3 : 2,3-dimethylpentane
- CH3−CO−CH(CH3)−CH3 : 2-methyl-3-butanone
- CH3−C≡C−CH(CH3)2 : 4-methyl-2-pentyne
- CH3−CHCl−CHBr−CH3 : 2-bromo-3-chlorobutane
General
✓✗Which one of the following orders is correct regarding the −I effect of the substituents?
- −NR2 > −OR < −F
- −NR2 > −OR > −F
- −NR2 < −OR > −F
- −NR2 < −OR < −F
General
✓✗The IUPAC name for CH3CH=CHCH2CH(NH2)CH2COOH is
- 5-amino-2-heptenoic acid
- β-amino-δ-heptenoic acid
- 5-aminohex-2-enecarboxylic acid
- 3-aminohept-5-enoic acid
General
✓✗The IUPAC name of CH3−CH(CH3)−CH(OH)−CH2−CO−CH3 is
- 5-methyl-4-hydroxyhexan-2-one
- 4-hydroxy-5-methylhexan-2-one
- 3-hydroxy-2-methylhexan-5-one
- 2-methyl-5-oxohexan-3-ol
General
✓✗The IUPAC name of CH3−O−CH2−CH3 is
- propan-1-ol
- ethoxymethane
- ethyl methyl ether (IUPAC)
- methoxyethane
General
✓✗The number of carbonyl compounds (aldehydes and ketones, structural isomers) of C5H10O is
- 7
- 8
- 5
- 6
General
✓✗The IUPAC name of the following compound (iso-octane) is
- 2,2,4-trimethylpentane
- 1,1,1,3-tetramethylbutane
- 2,4,4-trimethylpentane
- 2-methyl-4,4-dimethylpentane
General
✓✗Which species can act both as a nucleophile and as an electrophile?
- Cl−
- CH3CHO (carbonyl carbon electrophilic, O lone pairs nucleophilic)
- NO2+
- BF3
General
✓✗In a TLC experiment, a substance moved 3.0 cm while the solvent front moved 7.5 cm from the base line. The Rf value is
- 2.5
- 4.5
- 0.40
- 0.30
General
✓✗The total number of structural isomers (alcohols and ethers) of C5H12O is
- 8
- 12
- 6
- 14
General
✓✗In Dumas’ method, 0.30 g of an organic compound gave 50 mL of N2 at STP (273 K, 1 atm; molar volume 22.4 L). The percentage of nitrogen is
- 20.8%
- 15.6%
- 10.4%
- 41.7%