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(C) In the reaction $NH_3 + BF_3 	o NH_3.BF_3$,$NH_3$ acts as a Lewis base and $BF_3$ acts as a Lewis acid.$1$. In $NH_3$,the $N$ atom is $sp^3$ hybr

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Bond angle around $B$ increases

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(C) In the reaction $NH_3 + BF_3 	o NH_3.BF_3$,$NH_3$ acts as a Lewis base and $BF_3$ acts as a Lewis acid.$1$. In $NH_3$,the $N$ atom is $sp^3$ hybridized with a lone pair. Upon formation of the adduct,the lone pair is donated to $B$,causing the $H-N-H$ bond angle to decrease due to the change in hybridization and steric factors.$2$. In $BF_3$,the $B$ atom is $sp^2$ hybridized (trigonal planar,$120^\circ$). In the adduct $NH_3.BF_3$,the $B$ atom becomes $sp^3$ hybridized (tetrahedral,$\approx 109.5^\circ$). Thus,the bond angle around $B$ decreases,not increases.$3$. As $B$ changes from $sp^2$ to $sp^3$,the $s$-character in its hybrid orbitals decreases (from $33.3\%$ to $25\%$).$4$. The $B-F$ bond length increases because the hybridization changes from $sp^2$ to $sp^3$,reducing the double bond character present in $BF_3$ due to back-bonding.

List-$I$	List-$II$
$(1)$ Hydrogen bond	$(A)$ ${\rm{C}}$
$(2)$ Resonance	$(B)$ ${\rm{LiF}}$
$(3)$ Ionic solid	$(C)$ ${\rm{H}}_2$
$(4)$ Covalent solid	$(D)$ ${\rm{HF}}$
	$(E)$ ${\rm{O}}_3$

Which one of the following is not correct for the reaction given below:
$NH_3 + BF_3 \to NH_3.BF_3$

Similar Questions

Match the items in List-$I$ with the appropriate examples in List-$II$.

List-$I$ List-$II$

$(1)$ Hydrogen bond $(A)$ ${\rm{C}}$

$(2)$ Resonance $(B)$ ${\rm{LiF}}$

$(3)$ Ionic solid $(C)$ ${\rm{H}}_2$

$(4)$ Covalent solid $(D)$ ${\rm{HF}}$

$(E)$ ${\rm{O}}_3$

Blue vitriol contains which of the following types of bonds?

Which of the following represents the incorrect order of bond dissociation energy?

Which of the following pairs of ions is isoelectronic and isostructural?

Select the hybridisation which has non-planar geometry when all are bond pairs,but planar when there are $2$ lone pairs on the central atom:

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Which one of the following is not correct for the reaction given below:$NH_3 + BF_3 \to NH_3.BF_3$