General
✓✗Assertion: A methyl carbanion is pyramidal.
Reason: The carbon of a methyl carbanion is sp2 hybridised.
Reason: The carbon of a methyl carbanion is sp2 hybridised.
- Both Assertion and Reason are true and Reason is the correct explanation of Assertion
- Both Assertion and Reason are true but Reason is not the correct explanation of Assertion
- Assertion is true but Reason is false
- Both Assertion and Reason are false
General
✓✗In Kjeldahl’s method, 1.4 g of an organic compound gave ammonia that neutralised 20 mL of 1 N H2SO4. The percentage of nitrogen is
- 28%
- 40%
- 10%
- 20%
General
✓✗Compounds containing one or more benzene rings are classified as
- alicyclic compounds
- aromatic compounds
- aliphatic compounds
- heterocyclic compounds only
General
✓✗Which of the following groups shows −R (electron-withdrawing resonance) effect?
- −NH2
- −OH
- −OCH3
- −NO2
General
✓✗In Dumas’ method for the estimation of nitrogen, 0.25 g of an organic compound gave 40 mL of nitrogen collected at 300 K and 725 mm pressure. If the aqueous tension at 300 K is 25 mm, the percentage of nitrogen in the compound is
- 15.76
- 16.76
- 18.20
- 17.36
General
✓✗Considering the state of hybridisation of carbon atoms, which of the following molecules has all its carbon atoms in a straight line?
- CH3−CH=CH−CH3
- CH3−C≡C−CH3
- CH3−CH2−CH2−CH3
- CH2=CH−CH2−C≡CH
General
✓✗The number of chiral carbon atoms in CH3−CH(OH)−CH(OH)−CH3 (butane-2,3-diol) is
- 2
- 3
- 4
- 1
General
✓✗The IUPAC name of the following compound is
- trans-3-iodo-4-chloro-3-pentene
- cis-2-chloro-3-iodo-2-pentene
- trans-2-chloro-3-iodo-2-pentene
- cis-3-iodo-4-chloro-3-pentane
General
✓✗The number of sp-hybridised carbon atoms in CH3−C≡C−CH=CH2 is
- 1
- 3
- 4
- 2
General
✓✗Which of the following molecules represents the order of hybridisation sp2, sp2, sp, sp from left to right atoms?
- CH3−CH=CH−CH3
- HC≡C−C≡CH
- CH2=CH−CH=CH2
- CH2=CH−C≡CH
General
✓✗Which of the following liquids is best purified by vacuum distillation?
- Acetone
- Glycerol
- Benzene
- Ethanol
General
✓✗Which of the following statements are correct?
A. Kjeldahl’s method is not applicable to compounds containing nitrogen in a ring.
B. In Dumas’ method, nitrogen is estimated as N2 gas.
C. In the Carius method, halogens are estimated as silver halides.
D. Oxygen is estimated directly by heating with CuO.
Choose the correct answer from the options given below.
A. Kjeldahl’s method is not applicable to compounds containing nitrogen in a ring.
B. In Dumas’ method, nitrogen is estimated as N2 gas.
C. In the Carius method, halogens are estimated as silver halides.
D. Oxygen is estimated directly by heating with CuO.
Choose the correct answer from the options given below.
- A, B and C only
- A, B, C and D
- B and D only
- A and D only
General
✓✗The number of α-hydrogens available for hyperconjugation in the tert-butyl carbocation, (CH3)3C+, is
- 9
- 6
- 3
- 0
General
✓✗0.18 g of an organic compound on combustion gave 0.108 g of H2O. The percentage of hydrogen in it is
- 3.33%
- 10%
- 6.67%
- 12%
General
✓✗Which of the following acids is the strongest?
- CH3COOH
- ClCH2COOH
- BrCH2COOH
- FCH2COOH