Explanation:
The monohalogen derivatives of alkanes are called as alkyl halides denoted as R−X where (R−) is the alkyl group and X− is the halogen atom.
The common name of an alkyl halide is always written as two separate words. In IUPAC system, the monohalogen derivatives of alkanes are named as haloalkanes. for e.g., methyl chloride has IUPAC name chloromethane.
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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:
$A$ is