What is formed when ethyl alcohol reacts with acetyl chloride?

Identify product $A$ in the following reaction.
$2 CH_3COOH \xrightarrow{\Delta, P_2O_5} A + H_2O$

Among the given compounds,the most susceptible to nucleophilic attack at the carbonyl group is

$CH_3-C(=O)-O-CH_2-CH_3 + H-\bullet^- \to$ (where $\bullet = ^{18}O$) One of the products of the reaction is

How many organic products will be formed when the following compound undergoes decarboxylation?
(Image: $A$ substituted cyclopentane ring with two $-COOH$ groups at the same carbon atom,and two $-CH_3$ groups at adjacent carbons.)

Arrange the following in decreasing order of their acidic strength and give reason for your answer: $CH_{3}CH_{2}OH$,$CH_{3}COOH$,$ClCH_{2}COOH$,$FCH_{2}COOH$,$C_{6}H_{5}CH_{2}COOH$.