MCQ
Transition metals make the most efficient catalysts because of their ability to:
- AAdopt multiple oxidation states and to form complexes.
- BForm coloured ions.
- CShow paramagnetism due to unpaired electrons.
- DForm a large number of oxides.
Explanation:
Transition metals have partially filled d- orbitals so they can easily withdraw the electrons from the reagents or give electrons to them depending on the nature of the reaction. They also have a tendency to show large no. of oxidation states and the ability to form complexes which makes them a good catalyst.
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Assertion $(A)$: There is a considerable increase in covalent radius from $\mathrm{N}$ to $\mathrm{P}$. However from $As$ to $Bi$ only a small increase in covalent radius is observed.
Reason $(R)$: covalent and ionic radii in a particular oxidation state increases down the group.
In the light of the above statement, choose the most appropriate answer from the options given below:
$C{H_3} - C \equiv N\xrightarrow[{E{t_2}O}]{{C{H_3}Mgl}}\xrightarrow{{{H_3}{O^ \oplus }}}$