Which of the following species is not aromatic?

• Benzene

• Cyclooctatetraenyl dianion

• Tropylium ion

• Cyclopentadienyl cation

Substances that are oxidised and reduced in the following reaction are respectively

N₂H₄ (l) + 2H₂O₂ (l) N₂ (g) + 4H₂O (l)

• N₂H₄, H₂O

• N₂H₄, H₂O₂

• N₂, H₂O₂

• H₂O, N₂

The heat liberated when 1.89 g of benzoic acid is burnt in a bomb calorimeter at 25°C and it increases the temperature of 18.94 kg of water by 0.632°C. If the specific heat of water at 25°C is 0.998 cal/g-deg, the value of the heat of combustion of benzoic acid is

• 881.1 kcal

• 771.2 kcal

• 981.1 kcal

• 871.2 kcal

Which of the following alkenes will give same product by any method out of hydration, hydroboration-oxidation and oxymercuration-demercuration? 

• CH₃CH=CH₂

• CH₃CH=CHCH₃

• CH₃CH(CH₃)CH=CH₂

• 

Select the correct statement.

• Geometrical isomer may differ in dipole moment and visible/UV spectra.

• Complexes of the type [Ma₃b₃] can also have facial (fac) and meridional (mer) isomer.

• No optical isomer exists for the complex trans- [Co(en)₂Cl₂]⁺.

• All of these.

During the decomposition of H₂O₂ to give oxygen, 48 g O₂ is formed per minute at a certain point of time. The rate of formation of water at this point is

• 0.75 mol min^-1

• 1.5 mol min^-1

• 2.25 mol min^-1

• 3.0 mol min^-1

The major organic product formed in the following reaction.

Among the following, the achiral amino acid is

• 2-ethylalanine

• 2-methylglycine

• 2-hydroxymethylserine

• tryptophan

Assertion : When acetamide reacts with NaOH and Br,, methyl amine is formed.

Reason : The reaction occurs through intermediate formation of isocyanate.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false

• If both assertion and reason are false

30.

Assertion : Chlorobenzene is more reactive than benzene towards the electrophilic substitution reaction.

Reason : Resonance destabilises the carbocation.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false

• If both assertion and reason are false