Relative rate of solvolysis I underestimated this question and just compared the carbocation stability of all the compounds (after removal of chloride via $S_N1$) and got the order D>C>B>A... but my answer is incorrect, what am I missing out?
The rate of solvolysis is highest in (C) as a 6 membered ring is formed which is more stable than 4 &amp; 5 membered rings.

And (B) more readily formed than (D) because the NGP ability of oxygen is more than that of an alkene(due to high charge density of oxygen).

So the correct order is C>B>D>A.