Which of the following compounds will form the precipitate with aqueous $AgNO_3$ solution most readily?

An 'Assertion' $(A)$ and a 'Reason' $(R)$ are given below. Choose the correct answer from the following options.
Assertion $(A)$: Vinyl halides do not undergo nucleophilic substitution easily.
Reason $(R)$: Even though the intermediate carbocation is stabilized by loosely held $p-$ electrons,the cleavage is difficult because of strong bonding.

Arrange the following in order of their leaving group tendency:
$(I) Br^{-}$,$(II) CH_3COO^{-}$,$(III) CH_3CH_2O^{-}$,$(IV) PhO^{-}$

Identify the major product $(P)$ in the following reaction sequence.
$(CH_3)_3 CBr$ $\xrightarrow{\text{Alcoholic } KOH, \Delta}$ $\xrightarrow{HBr} P$

Which of the following is most reactive towards nucleophilic substitution reaction?

$1$-chloroapocamphane is a bridgehead halide. Which of the following statements about its reactivity toward $AgNO_3$ is true?