- A${C_6}{H_5} - \mathop C\limits^ \oplus {H_2}$
- B$C{H_2} = CH - \mathop C\limits^ \oplus {H_2}$
- C$C{H_3} - \mathop C\limits^ \oplus H - C{H_3}$
- ✓$HO - \mathop C\limits^ \oplus {H_2}$
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Assertion $(A)$ and the other is labeled as Reason $(R)$. Assertion $(A)$: $\mathrm{CH}_2=\mathrm{CH}-\mathrm{CH}_2-\mathrm{Cl}$ is an example of allyl halide
Reason$(R)$: Allyl halides are the compounds in which the halogen atom is attached to $\mathrm{sp}^2$ hybridised carbon atom.
In the light of the two above statements, choose the $most \ appropriate$ answer from the options given below:

$ {\left[\mathrm{Ag}\left(\mathrm{NH}_3\right)\right]^{+}+\mathrm{NH}_3 \rightleftharpoons\left[\mathrm{Ag}\left(\mathrm{NH}_3\right)_2\right]^{+} ; \mathrm{k}_2=1.7 \times 10^{-3}}$
then the formation constant of $\left[\mathrm{Ag}\left(\mathrm{NH}_3\right)_2\right]^{+}$is