Question
How does colour appear in coordination compounds? Its explanation is based on crystal field theory.
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Answer
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Describe the common name system and IUPAC system of naming amines.
Write the chemical reactions of $C _2 H _5 OH$ with following compounds :
(i) $CH _2 N_2$ (diazomethane) (ii) ketone, (iii) $HC \equiv$ $C H$ (iv) $C H _3 N C O$ (Methyl-isocyanate) (v) $C H _3 C H O$ (ethanol) (vi) conc. $H _2 SO _4$ at $0^{\circ} C$.
→(i) $CH _2 N_2$ (diazomethane) (ii) ketone, (iii) $HC \equiv$ $C H$ (iv) $C H _3 N C O$ (Methyl-isocyanate) (v) $C H _3 C H O$ (ethanol) (vi) conc. $H _2 SO _4$ at $0^{\circ} C$.
Explain the energy distribution curve of gaseous molecules and also discuss the effect of temperature on it.
- Account for the following:
- Mn shows the highest oxidation state of +7 with oxygen but with fluorine it shows the highest oxidation state of +4.
- Cr2+ is a strong reducing agent.
- Cu2+ salts are coloured while Zn2+ salts are white.
- Complete the following equations:
- $2\text{MnO}_{2} + 4\text{KOH} + \text{O}_{2} \xrightarrow{\Delta}$
- $\text{Cr}_{2}\text{O}^{2-}_{7}+ 14\text{H}^{+} + 6\text{I}^{-}\xrightarrow{}$
(i) Define the order of a reaction.
(ii) Explain the effect of concentration of reactant on the rate constant.
(iii) For a first order reaction, if the rate constant at 500 K and 600 K are $0.03 s^{-1}$ and $0.06 s^{-1}$ respectively, then calculate the activation energy.
$
\left[R=8.314 JK^{-1} mol^{-1}, \log 2=0.3010\right]
$
→(ii) Explain the effect of concentration of reactant on the rate constant.
(iii) For a first order reaction, if the rate constant at 500 K and 600 K are $0.03 s^{-1}$ and $0.06 s^{-1}$ respectively, then calculate the activation energy.
$
\left[R=8.314 JK^{-1} mol^{-1}, \log 2=0.3010\right]
$
Consider the reaction $\text{R}\xrightarrow{\ \ \text{k}\ \ } \text{P}.$ The change in concentration of R with time is shown in the following plot:
→- Predict the order of the reaction.
- Derive the expression for the time required for the completion of the reaction.
- What does the slope of the above line indicate?
Explain oxidation and reduction reactions of carbonyl compounds.
- Complete the following chemical equations:
- $\text{Cr}_{2}\text{O}_{7}^{2-}\text{(aq)}+\text{H}_{2}\text{S}\text{(g)}+\text{H}^{+}\text{(aq)}\rightarrow$
- $\text{Cu}^{2+}\text{(aq)}+\text{I}^{-}\text{(aq)}\rightarrow$
- How would you account for the following:
- The oxidising power of oxoanions are in the order VO+2 < Cr2O2–7 <MnO–4.
- The third ionisation enthalpy of manganese (Z = 25) is exceptionally high.
- Cr2+ is a stronger reducing agent than Fe2+.
[A], [B], [C], [D], [E], [F] and [G] are amines each of which forms a hydrochloride containing 32.42% chlorine. [A], [B], [C] and [D] evolve N2 on reaction with HNO2, but [E], [F], [G] and [H] do not. Give structures of [A] to [H] with reasons.
Write the $S _{ N } 1$ mechanism of unimolecular nucleophilic substitution reaction.
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