$CH_3CH_2COOH$ $\xrightarrow{P_2O_5}$ $X$ $\xrightarrow{H_2O}$ $Y$ $\xrightarrow{SOCl_2}$ $Z$
Identify $X$,$Y$ and $Z$.

An organic compound $[A]$,molecular formula $C_{10}H_{20}O_2$,was hydrolyzed with dilute sulphuric acid to give a carboxylic acid $[B]$ and an alcohol $[C]$. Oxidation of $[C]$ with $CrO_3-H_2SO_4$ produced $[B]$. Which of the following structures are not possible for $[A]$?

The major product of the following reaction sequence is

Assertion : The $pK_a$ of acetic acid is lower than that of phenol.
Reason : Phenoxide ion is more resonance stabilised.

Given below are two statements:
Statement $I:$ Ethyl pent$-4-$yn$-$oate on reaction with $CH_{3}MgBr$ gives a $3^{\circ}$ alcohol.
Statement $II:$ In this reaction,one mole of ethyl pent$-4-$yn$-$oate utilizes two moles of $CH_{3}MgBr$.
In the light of the above statements,choose the most appropriate answer from the options given below:

Hydrolysis of an ester gives acid $A$ and alcohol $B$. $A$ reduces Fehling solution and oxidation of $B$ gives $A$. The ester is