In which one of the following molecules strongest back donation of an electron pair from halide to boron is expected? fuEufyf[kr v.kqvksa esa ls fdl ,d esa gSykbM ls cksjku dks ,d bysDVªkWu ;qXe dk iz

Question

In which one of the following molecules strongest back donation of an electron pair from halide to boron is expected? fuEufyf[kr v.kqvksa esa ls fdl ,d esa gSykbM ls cksjku dks ,d bysDVªkWu ;qXe dk izcyre i'; Mksus'ku izR;kf'kr gS\

(A) B3
(B) BBr3
(C) BCl3
(D) BF3

Prashant Kotian · Accepted Answer

Correct answer: D. B F F F  B F F F Due to small size atom show strongest back bonding in BF3. In case of BF3 (2P – 2P back bonding) while in BCl3 (2P–3P), BBr3 (2P – 4P) & BI3 (2P – 5P) back bonding. So extent of back bonding is maximum in (2P – 2P)

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