$RCOOH$ on treatment with $PCl_5$ and $KCN$,is subjected to hydrolysis followed by Clemmensen's reduction,the product obtained is

  • A
    $RCH_2-COCl$
  • B
    $RCH_2-COOH$
  • C
    $RCOCN$
  • D
    $RCN$

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Arrange the following in decreasing order of acidic strength:
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$D. Br-CH_2-CH_2-COOH$

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