A given nitrogen-containing aromatic compound A reacts with Sn/HCl, followed by HNO₂ to give an unstable compound B. B, on treatment with phenol, forms a beautiful coloured compound C with the molecular formula C₁₂H₁₀N₂O. The structure of compound A is

Consider the reaction

CH₃CH₂CH₂Br + NaCN → CH₃CH₂CH₂CN + NaBr

This reaction will be the fastest in

The correct structure of the product A formed in the reaction
is

Which among the given molecules can exhibit tautomerism?

The correct order of strengths of the carboxylic acids
is

The compound that will react most readily with gaseous bromine has the formula:

Which one of the following compounds shows the presence of intramolecular hydrogen bond?

The molar conductivity of a 0.5 mol / dm³ solution of AgNO₃ with electrolytic conductivity of 5.76 × 10^-3 S cm^-1 at 298 K is

The decomposition of phosphine (PH₃) on tungsten at low pressure is a first-order reaction. It is because the

The coagulation values in millimoles per litre of the electrolytes used for the coagulation of As₂S₃ are given below:

I. (NaCl) = 52,     II. (BaCl₂) = 0.69     III. (MgSO₄) = 0.22

The correct order of their coagulating power is