Assertion: Six p-orbitals in benzene combine to form three bonding and three antibonding molecular orbitals. Reason: Each bonding orbital contains a pair of electrons with opposite spins.

Assertion: The potential energy barrier for rotation about C=C bond in 2-butene is much higher than that in ethylene. Reason: Hyperconjugation effect decreases the double bond character.

Assertion: [10]-Annulene is an aromatic because it contains Huckel number of π-electrons. Reason: Steric interaction between internal hydrogen makes it non-planar.

Assertion: Azulene is a non-benzenoid compound. Reason: It is planar, has a cyclic array of 10 π-electrons but does not contain benzene rings.

Assertion: The dipole moment of 1, 2-diphenylcyclopropenone is larger than that of benzophenone. Reason: 1, 2-diphenylcyclopropenone is a cyclic compound while benzophenone is an open chain compound.

Assertion: Friedel-Crafts reaction between benzene and acetic anhydride in the presence of anhydrous AlCl₃ yield. Reason: Acetophenone formed poisons the catalyst preventing further reaction.

Assertion: Cyclooctatetraene reacts with two equivalents of potassium to form a stable compound with formula 2K⁺ C₈H₈^2-_. Reason: Cyclooctatetraene is non-aromatic but 2K⁺ C₈H₈^2- is aromatic.

Assertion: A triplet carbene is more stable than a singlet carbene. Reason: In triplet carbene, carbon atom is sp-hybridized while in singlet carbene it is sp²-hybridized.

Which of the following statements is/are correct? A. Allene (CH₂=C=CH₂) is a planar molecule. B. [14]-Annulene is aromatic while [10]-annulene is not aromatic. C. The carbocation, F₃C-C⁺ is less stable than the carbocation, F₃C⁺_.

Carbon atoms of 1, 3-butadiene are numbered as shown below CH₂=CH−CH=CH₂ Which of the following statements regarding the above compound is incorrect? A. Carbon atoms 1 and 4 are sp²-hybridized. B. The single bond between C₂ and C₃ is of the same length as the carbon-carbon bond length in ethane. C. It is a conjugated diene.

Which of the following statements is/are false? A. The resonance energy of benzene is higher than its heat of hydrogenation. B. The greater stability of trans-but-2-ene can be explained on the basis of hyperconjugation effect. C. Dichlorocarbene (:CCl₂) is a nucleophile.

Which of the following statements is/are correct?

Which of the following statements is/are incorrect? A. Corey-House reaction can be used to prepare only alkenes with odd number of carbon atoms. B. Reforming involves conversion of aliphatic into aromatic hydrocarbons. C. The formation of alkenes by the action of zinc on alkyl halides is called Frankland reaction.

Which of the following statements is/are incorrect? A. In two step reaction, the rate determining step has the lowest energy of activation. B. All the carbon atoms in bicyclobutane are sp³-hybridized. C. Free radicals are produced by homolytic cleavage of covalent bonds.

Assertion: N₃^- is weaker base than NH₂^-. Reason: The lone pair of electron on N-atom in N₃^- is in a sp²-orbital while in NH₂^- it is in a sp³-orbital.