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Question

Chemistry Question on Chemical bonding and molecular structure

What is the correct order of decreasing bond angle?

A

NH4+>NH3>NH2−NH_4^+ >NH_3 > NH_2^-

B

NH3>NH2−>NH4+NH_3 > NH_2^- > NH_4^+

C

NH2−<NH3>NH4+NH_2^- < NH_3 > NH_4^+

D

NH3>NH4−>NH2−NH_3 > NH_4^- > NH_2^-

Answer

NH4+>NH3>NH2−NH_4^+ >NH_3 > NH_2^-

Explanation

Solution

The correct order of decreasing bond angle is           NH4+>NH3>NH2− \, \, \, \, \, \, \, \, \, \, NH_4^+ > NH_3 > NH_2^- . This is because all of them involves sp3^3 hybridisation. The number of lone pair of electrons present on N-atoms are 0, 1, 2 respectively. Greater the number of lone pairs, greater the repulsion on the bond pairs and hence, smaller is the bond angle.