General
✓✗Reduction of but-2-yne with H2 and Lindlar’s catalyst gives
- trans-but-2-ene
- cis-but-2-ene
- butane
- but-1-ene
General
✓✗NaNH2 can deprotonate ethyne because
- ethyne is a stronger base than NH2−
- ammonia (pKa about 38) is a weaker acid than ethyne (pKa about 25)
- ethyne has no hydrogen
- NaNH2 is an oxidising agent
General
✓✗Statement I: Cyclopentadiene is aromatic.
Statement II: The cyclopentadienyl anion is aromatic.
Statement II: The cyclopentadienyl anion is aromatic.
- Both Statement I and Statement II are correct
- Both Statement I and Statement II are incorrect
- Statement I is correct but Statement II is incorrect
- Statement I is incorrect but Statement II is correct
General
✓✗In the following Newman projections of n-butane (viewed along C2−C3), the most stable conformation is
- staggered, with the two CH3 groups at 180° (anti)
- eclipsed, with the CH3 groups eclipsing each other
- staggered, with the two CH3 groups at 60° (gauche)
- eclipsed, with each CH3 eclipsing an H atom
General
✓✗Toluene on oxidation with alkaline KMnO4 followed by acidification gives
- phenol
- benzaldehyde
- benzoic acid
- benzyl alcohol
General
✓✗The increasing order of reactivity towards electrophilic substitution for benzene (I), toluene (II), anisole (III) and (trifluoromethyl)benzene (IV) is
- I < IV < III < II
- II < III < I < IV
- IV < I < II < III
- III < II < I < IV
General
✓✗Assertion: Nitrobenzene does not undergo Friedel−Crafts alkylation.
Reason: The nitro group deactivates the benzene ring strongly.
Reason: The nitro group deactivates the benzene ring strongly.
- 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
✓✗The hybridisation of carbon in alkanes is
- sp3d
- sp
- sp2
- sp3
General
✓✗Which of the following reactions of benzene is an addition reaction?
- C6H6 + Cl2 (FeCl3) → C6H5Cl
- C6H6 + HNO3 (H2SO4) → C6H5NO2
- C6H6 + CH3Cl (AlCl3) → C6H5CH3
- C6H6 + 3H2 (Ni) → C6H12
General
✓✗The number of σ and π bonds in ethyne are respectively
- 3 and 1
- 2 and 3
- 3 and 2
- 4 and 1
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
✓✗In the addition of HBr to CF3−CH=CH2, the major product is
- CF3−CH2−CH2Br
- CF3−CBr=CH2
- CF3−CHBr−CH3
- BrCF2−CH=CH2
General
✓✗Alkanes are soluble in
- dilute alkalis
- non-polar solvents such as benzene
- dilute acids
- water
General
✓✗Ozonolysis of buta-1,3-diene gives
- propanal and methanal
- two molecules of methanal and one molecule of glyoxal (ethanedial)
- two molecules of ethanal
- only glyoxal
General
✓✗When CH3CH2CHCl2 is treated with NaNH2, the product formed is
- CH3−C≡CH
- CH3CH2CH(NH2)2
- CH3CH2CH(Cl)NH2
- CH3−CH=CH2