KVPY Sample Paper KVPY Stream-SX Model Paper-22

  • question_answer
    Correct order of bond angles for the following species is

    A) \[N{{H}_{3}}>PC{{l}_{3}}>BC{{l}_{3}}\]

    B) \[BC{{l}_{3}}>N{{H}_{3}}>PC{{l}_{3}}\]

    C) \[BC{{l}_{3}}>PC{{l}_{3}}>N{{H}_{3}}\]

    D) \[PC{{l}_{3}}>BC{{l}_{3}}>N{{H}_{3}}\]

    Correct Answer: B

    Solution :

    \[BC{{l}_{3}}\] is trigonal in shape where bond angle is \[120{}^\circ \]. In \[N{{H}_{3}}\] and \[PC{{l}_{3}}\] (both are having pyramidal geometry), though the central atom has equal number of lone pairs and bond pairs, the valence shell of P is relatively bigger, so electrons suffers lesser repulsion and thus bond angle is lower. Thus, the correct order of bond angle is \[BC{{l}_{3}}>N{{H}_{3}}>PC{{l}_{3}}\].

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