General
✓✗Electrolysis of aqueous sodium ethanoate (Kolbe’s method) gives
- methane at the cathode
- ethene at the anode
- ethane at the anode
- propane at the anode
General
✓✗In Friedel−Crafts alkylation, besides AlCl3, the other reactants are
- C6H6 + NH3
- C6H6 + CH3Cl
- C6H6 + CH3COCl
- C6H6 + CH4
General
✓✗Benzene reacts with CH3COCl in the presence of anhydrous AlCl3. The product is converted to ethylbenzene by
- oxidation with KMnO4
- ozonolysis
- Clemmensen reduction (Zn−Hg/HCl)
- nitration
General
✓✗Friedel−Crafts acylation of benzene with CH3COCl and anhydrous AlCl3 gives
- benzoic acid
- toluene
- benzaldehyde
- acetophenone
General
✓✗Which one of these is not compatible with arenes?
- Greater stability
- Delocalisation of π-electrons
- Resonance
- Electrophilic additions
General
✓✗The number of geometrical isomers of but-2-ene is
- 4
- 3
- 2
- 1
General
✓✗Heating higher alkanes to a high temperature in the absence of air so that they break into smaller molecules is called
- aromatisation
- combustion
- pyrolysis (cracking)
- isomerisation
General
✓✗Which of the following is aromatic?
- Cyclobutadiene
- Cyclohexene
- Pyridine
- Cyclooctatetraene
General
✓✗The energy difference between the eclipsed and staggered conformations of ethane is about
- 348 kJ mol−1
- 12.5 kJ mol−1
- 1.25 kJ mol−1
- 125 kJ mol−1
General
✓✗The common name and IUPAC name of C6H5CH(CH3)2 are
- xylene; dimethylbenzene
- toluene; methylbenzene
- styrene; ethenylbenzene
- cumene; (propan-2-yl)benzene
General
✓✗Statement I: The reaction of ethene with Br2 is an electrophilic addition.
Statement II: The reaction of methane with Br2 in light is an electrophilic substitution.
Statement II: The reaction of methane with Br2 in light is an electrophilic substitution.
- 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
✓✗Which one of the following reactions does NOT give benzene as the product?
- n-hexane \( \xrightarrow{\;\text{Mo}_2\text{O}_3\text{, 773 K, 10--20 atm}\;} \)
- HC≡CH \( \xrightarrow{\;\text{red hot iron tube, 873 K}\;} \)
- C6H5COONa \( \xrightarrow{\;\text{soda lime},\,\Delta\;} \)
- C6H5N2+Cl− \( \xrightarrow{\;\text{H}_2\text{O, warm}\;} \)
General
✓✗Which reagent converts but-2-yne into trans-but-2-ene?
- HgSO4/H2SO4
- H2/Lindlar catalyst
- Na in liquid NH3
- H2/Pt (excess)
General
✓✗Which of the following statements are correct?
A. Alkanes undergo free-radical substitution with halogens in light.
B. Alkenes undergo electrophilic addition.
C. Benzene undergoes electrophilic addition more readily than substitution.
D. Terminal alkynes are acidic.
Choose the correct answer from the options given below.
A. Alkanes undergo free-radical substitution with halogens in light.
B. Alkenes undergo electrophilic addition.
C. Benzene undergoes electrophilic addition more readily than substitution.
D. Terminal alkynes are acidic.
Choose the correct answer from the options given below.
- A, B and D only
- A, B, C and D
- B and C only
- A and C only
General
✓✗Assertion: Cyclooctatetraene is not aromatic.
Reason: It is non-planar and has 8 π electrons.
Reason: It is non-planar and has 8 π electrons.
- 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