Hydrocarbons

The number of sigma (σ) and pi ($\mathrm{\pi }$) bonds present in benzene respectively are :

• 12, 6

• 6, 6

• 6, 12

• 12, 3

Identify 'B in the following reaction ${\mathrm{CH}}_2={\mathrm{CH}}_2 + \mathrm{HCl} \stackrel{\mathrm{anhy} {\mathrm{AlCl}}_3}{\to } \mathrm{A} + 2\left[\mathrm{H}\right] \underset{{\mathrm{C}}_2{\mathrm{H}}_5\mathrm{OH}}{\overset{\mathrm{Zn}-\mathrm{Cu}}{\to }} \mathrm{B} + \mathrm{HCl}$

• CH₄

• C₂H₆

• C₂H₅Cl

• C₂H₅OH

Which of the following compound(s) has 'Z' configuration ?

• (i) only

• (ii) only

• (iii) only

• (i) and (iii) only

The structure of the compound formed, when nitrobenzene is reduced by lithium aluminium hydride (LiAlH₄) is

Diels-Alder reaction will not take place with which of the following reactants?

In which of the following, ortho/para substitution by an electrophile is very facile?

• Ntrobenzene

• Phenol

• Benzoic acid 

• Acetophenone

Reduction of nitrobenzene with Zn and alcoholic KOH solution results in the formation of the following compound.

• hydrazobenzene

• azobenzene

• aniline

• phenylhydroxylamine

Nitrobenzene on reduction using zinc in alkaline medium results in X. The number of sigma (σ) and pi ($\mathrm{\pi }$) bonds in X is-

• 24 σ, 7 $\mathrm{\pi }$

• 24 σ, 6 

• 27 σ, 7 

• 24 σ, 6 

Identify A and B in the following reactions

Which of the following statements is not correct?

• The six carbons in benzene are sp² hybridised.

• Benzene has (4n + 2) Π electrons.

• Benzene undergoes substitution reactions

• Benzene has two carbon-carbon bond lengths, 1.54 Å and 1.34 Å.