Solutions — Chemistry STD 12 Science — Question

Give plausible explanation for each of the following:

Cyclohexanone forms cyanohydrin in good yield but 2, 2, 6-trimethylcyclohexanone does not.

Explain the rate expression for a reaction in which stoichiometric coefficients of reactants and produch are not same or unit.

Give examples and suggest reasons for the following features of the transition metal chemistry:

The highest oxidation state is exhibited in oxoanions of a metal.

Draw figure to show the splitting of d orbitals in an octahedral crystal field. orbitals in an octahedral crystal field.

Why are Mn²⁺ compounds more stable than Fe²⁺ towards oxidation to their +3 state?

Explain how does the –OH group attached to a carbon of benzene ring activate it towards electrophilic substitution?

Concentrated nitric acid used in laboratory work is 68% nitric acid by mass in aqueous solution. What should be the molarity of such a sample of the acid if the density of the solution is 1.504 g mL^–1?

Aniline is a weaker base than ethyl amine. Explain.

Explain inversion, retention and racemisation.

Give reasons for the following observations:
p-dichlorobenzene has higher melting point than those of o– and m– isomers.