\( \mathrm{NH}_{3} \) has got pyramidal structure. By replacement of \( \mathrm{H} \) atoms it f...

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\( \mathrm{NH}_{3} \) has got pyramidal structure. By replacement of \( \mathrm{H} \) atoms it forms \( \left(\mathrm{CH}_{3}\right)_{3} \mathrm{~N} \) and \( \left(\mathrm{SiH}_{3}\right)_{3} \mathrm{~N} \) molecules which are found to have different geometries.
Which is the correct relation of bond angles?
(a) \( \mathrm{NH}_{3}\left(\mathrm{CH}_{3}\right)_{3} \mathrm{~N}\left(\mathrm{SiH}_{3}\right)_{3} \mathrm{~N} \)
(b) \( \left(\mathrm{SiH}_{3}\right)_{3} \mathrm{~N}\left(\mathrm{CH}_{3}\right)_{3} \mathrm{~N}\mathrm{NH}_{3} \)
(c) \( \mathrm{NH}_{3}\left(\mathrm{SiH}_{3}\right)_{3} \mathrm{~N}\left(\mathrm{CH}_{3}\right)_{3} \mathrm{~N} \)
(d) \( \left(\mathrm{CH}_{3}\right)_{3} \mathrm{~N}\left(\mathrm{SiH}_{3}\right)_{3} \mathrm{~N}\mathrm{NH}_{3} \)
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