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The correct statements among (a) to (d) are : (a) saline hydrides produce H2 gas when reacted with H2O. (b) reaction of LiAlH4 with BF3 leads to B2H6. (c) PH3 and CH4 are electron - rich and electron - precise hydrides, respectively. (d) HF and CH4 are called as molecular hydrides. (1) (a), (b), (c) and (d) (2) (a), (c) and (d) only (3) (c) and (d) only (4) (a), (b) and (c) only

1. (a), (b), (c) and (d)
2. (a), (c) and (d) only
3. (c) and (d) only
4. (a), (b) and (c) only

Correct answer: (c) and (d) only

Solution

PH3 is indeed an electron-rich hydride due to the presence of a lone pair on phosphorus, while CH4 is classified as an electron-precise hydride because it has a stable tetrahedral structure with no lone pairs, making options (c) and (d) correct.

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