The end product of the following reaction is: $CH_3-CH_2-COOH$ $\xrightarrow[\text{red } P]{Cl_2} X$ $\xrightarrow{\text{Alc. KOH}} Y$

Which of the following rings is highly strained?

Give the reaction for heating benzoic acid with soda lime,also known as the decarboxylation of benzoic acid.

The strongest acid amongst the following compounds is:

Arrange the products $I$,$II$,$III$ from the following reactions in decreasing order of their acid strength.
$A) \text{Propylbenzene} \xrightarrow[\text{ (ii) } H_3O^{+}]{\text{ (i) } KMnO_4 / OH^{-}} I$
$B) CH_3COOH \xrightarrow[\text{ (ii) } H_2O]{\text{ (i) } Br_2 / \text{red } P} II$
$C) \text{Bromobenzene}$ $\xrightarrow[\substack{\text{ (ii) } CO_2 / \text{dry ether} \\ \text{ (iii) } H_3O^{+}}]{\text{ (i) } Mg / \text{dry ether}} III$

What is compound $Z$?
$CH_3CH_2CH_2Br$ $\xrightarrow{NaCN} X$ $\xrightarrow[heat]{H_3O^{+}} Y$ $\xrightarrow[H^{+}]{CH_3CH_2OH} Z$