Hydrated $AlC{l_3}$ is used as

  • A

    Catalyst in cracking of petroleum

  • B

    Catalyst in Friedel Craft reaction

  • C

    Mordant

  • D

    All of these

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$c.$  Two boron atoms have four $B-O$ bonds while other two have three $B-O$ bonds

$d.$  Each boron atom has one $-OH$ groups

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