7.37 Discuss the trends in chemical reactivity of group 15 elements. 

<p><strong>7.37&nbsp;</strong></p><p>Chemical reactivity of group 15 elements towards hydrogen, oxygen, halogens, and metals are discussed below.</p><p>Reactivity towards hydrogen: Group 15 elements react with H to form hydrides of type EH3 where E=N, P, As, Sb or On moving down from NH₃ to BiH₃, the stability of the hydrides decreases. For example, the P-H bond in PH₃ is less stable than the N-H bond in NH₃. The strength of the E-H bond gets weaker as the size of the central atom increases.</p><p>Stability order of E-H bond (where E is group 15 elements) can be represented as</p><p>N-H &gt; P-H &gt; As-H &gt;Sb-H &gt; Bi-H</p><p>Reactivity towards oxygen: Group 15 elements react with O to form oxides of the type E₂O₃ and E₂O₅ where E = N, P, As, Sb or Bi. The oxide of the element with higher oxidation state is more acidic than those with lower oxidation Down the group, the acidic character of the oxides decreases.</p><p>Reactivity towards halogens: Group 15 elements form halides of the type EX₃ and EX₅ where E = N, P, As, Sb or Bi. However, N does not form pentahalides EX₅ as it lacks d-orbital. All group 15 elements form trihalides but trihalides of N are</p><p>Reactivity towards metals: Group 15 elements react with metals to form compounds of general formula M₃E₂ where E= N, P, As, Sb or The binary compounds formed by the reaction of group 15 elements with metal show oxidation state -3.</p>

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