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Which of the following is Lewis acid-Lewis base interaction?
(i) \( \mathrm{B}\left(\mathrm{CH}_{3}\right)_{3} \) and \( \mathrm{N}\left(\mathrm{CH}_{3}\right)_{3} \) form addition compound
\( \mathrm{P} \)
(ii) \( \mathrm{H}_{3} \mathrm{BO}_{3} \) and \( \mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH} \) form addition compound
W
(iii) Ammonium ion is formed by protonation of ammonia molecule
(iv) \( \mathrm{BF}_{3} \) and \( \mathrm{NH}_{3} \) form addition compound
(a) Only (ii), (iii) are correct
(b) Only (iv) is correct
(c) (ii), (iii) and (iv) are correct
(d) All are correct
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