The compound that reacts the fastest with sodium methoxide is

Which of the following compound possesses the C-H bond with the lowest bond dissociation energy?

• Toluene

• Benzene

• n-pentane

• 2, 2-dimethyl propane

In the presence of HCl, H₂S results the precipitation of group-2 elements but no group-4 elements during qualitative analysis. It is due to

• higher concentration of S^2-

• higher concentration of H⁺

• Lower concentration of S^2-

• Lower concentration of H⁺

IUPAC name of the compound,

• 1-bromobut-2-ene

• 2-bromo-2-butene

• bromobutene

• 1-bromobut-3-ene

Which of the following gives positive Fehling's solution test?

• Sucrose

• Glucose

• Fats

• Protein

246.

Electrophile that participates in nitration of benzene is

• NO⁺

• NO${}_2^{+}$

• NO

• NO${}_3^{-}$

Which of the following is most likely to show optical isomerism ?

• HC≡C-$\underset{\mathrm{Cl}}{\overset{\mathrm{H}}{\underset{\left|}{\overset{\right|}{\mathrm{C}}}}}$-C≡CH

• HC≡C-$\underset{\mathrm{Cl}}{\overset{\mathrm{H}}{\underset{\left|}{\overset{\right|}{\mathrm{C}}}}}$-CH₃

• HC≡C-$\underset{\mathrm{Cl}}{\overset{\mathrm{H}}{\underset{\left|}{\overset{\right|}{\mathrm{C}}}}}$-H

• HC≡C-C (Cl) = CH₂

Acetylene reacts with HCN in the presence of Ba(CN)₂ to yield :

• 1, 1-dicyanoethane

• 1, 2-dicyanoethane

• vinyl cyanide

• None of the above

The following compound will undergo electrophilic  substitution more readily than benzene:

• nitrobenzene

• benzoic acid

• benzaldehyde

• phenol

The correct statement about the compounds (a),(b)and (c) is :

• (A) and (B) are identical

• (A) and (B) are diasteromers

• (A) and (B) are not enantiomers

• (A) and (B) are enantiomers