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Which of the following is not nucleophil...

Which of the following is not nucleophiles?
(i) `HCl`
(ii) `SiF_(4)`
(iii) `P(CH_(3))_(3)`
(iv)`CH_(2)=CH_(2)`

A

(i), (ii), (iv)

B

(i), (ii)

C

(iii), (iv)

D

(ii), (iv)

Text Solution

Verified by Experts

The correct Answer is:
B
`HCl`, typical Bronsted acid is electrophilic because eight valence `e^(-)'s`, it can neverthless be an acceptor of a nucleophile's unshared pair by expanding its `d` subshell of valence shell to `12 e^(-)S`:
`SiF_(4)+2:overset(..)underset(..)F:^(-)rarrSiF_(6)^(2-)`
This behavior is observed with elements in the third and higher periods of the periodic table that form covalent bonds.
`:P(CH_(3))_(3)` is nucleophilic as it has an unshared electron pair. Ethene `(CH_(2)=CH_(2))` is also nucleophilic as it has two easily availiable electrons in a `pi` bonds.
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