Identify the reagents $X, Y, Z$ for the following dehydration reactions of alcohols:
$CH_3-CH_2-OH \xrightarrow{X} CH_2=CH_2 + H_2O$
$CH_3-CH(OH)-CH_3 \xrightarrow{Y} CH_3-CH=CH_2 + H_2O$
$(CH_3)_3C-OH \xrightarrow{Z} (CH_3)_2C=CH_2 + H_2O$

  • A
    $X$$Y$$Z$
    $H_2SO_4, 443 \ K$$85 \% \ H_3PO_4, 440 \ K$$20 \% \ H_3PO_4, 358 \ K$
  • B
    $X$$Y$$Z$
    $85 \% \ H_3PO_4, 440 \ K$$H_2SO_4, 443 \ K$$20 \% \ H_3PO_4, 358 \ K$
  • C
    $X$$Y$$Z$
    $20 \% \ H_3PO_4, 358 \ K$$H_2SO_4, 443 \ K$$85 \% \ H_3PO_4, 440 \ K$
  • D
    $X$$Y$$Z$
    $H_2SO_4, 443 \ K$$20 \% \ H_3PO_4, 358 \ K$$85 \% \ H_3PO_4, 440 \ K$

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