Correct set of electron deficient species is : (i) \( \mathrm{BeCl}...

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Correct set of electron deficient species is :
(i) \( \mathrm{BeCl}_{2}(s) \)
(ii) \( \mathrm{Al}_{2} \mathrm{Cl}_{6} \)
(iii) \( \mathrm{BeH}_{2}(s) \)
(iv) \( \mathrm{AlH}_{3}(s) \)
\( \mathrm{P} \)
(a) i, ii, iii, iv
(b) only ii, iii, iv
(c) only iii, iv
(d) only iii
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