Consider compounds $A$, $B$ and $C$ with following structural formulae: $A = CH_{3} - CH_{2} - CH_{2} - CH_{2} - CH_{2} - OH$, $B = CH_{2} = CH - CH_{2} - CH_{2} - CH_{3}$, $C = HO - CH_{2} - CH_{2} - CH(OH) - CH_{3}$. For the conversion of $B$ from $A$, reagent $(D)$ required is . . . . . . and structural formula of product $(E)$ obtained when $C$ undergoes same reaction using excess reagent $(D)$ is . . . . . . .

• A
  Conc. $H_{2}SO_{4}$, $CH_{2} = CH - CH(OH)CH_{3}$
• B
  $D$: Conc. $H_{2}SO_{4}$, $E$: $HO - CH_{2} - CH_{2} - CH = CH_{2}$
• C
  $D$: $PCC$, $E$: $CH_{2} = CH - CH = CH_{2}$
• D
  $D$: Conc. $H_{2}SO_{4}$ or $H_{3}PO_{4}$, $E$: $CH_{2} = CH - CH = CH_{2}$