Which of the following are isoelectronic species? \[\overset{\oplus }{\mathop{C{{H}_{3}}}}\,(I),\text{ }\overset{\Theta }{\mathop{N{{H}_{2}}}}\,(II),\text{ }{{\overset{\oplus }{\mathop{NH}}\,}_{4}}(III)\,\,and\,\text{ }N{{H}_{3}}(IV)\]

Which of the following are isoelectronic species? \[\overset{\oplus }{

1.	Which of the following are isoelectronic species? \[\overset{\oplus }{\mathop{C{{H}_{3}}}}\,(I),\text{ }\overset{\Theta }{\mathop{N{{H}_{2}}}}\,(II),\text{ }{{\overset{\oplus }{\mathop{NH}}\,}_{4}}(III)\,\,and\,\text{ }N{{H}_{3}}(IV)\]
A.	II, III and IV
B.	I, II and III
C.	I, II and IV
D.	II and I
Answer» B. I, II and III

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Which of the following are isoelectronic species? \[\overset{\oplus }{\mathop{C{{H}_{3}}}}\,(I),\text{ }\overset{\Theta }{\mathop{N{{H}_{2}}}}\,(II),\text{ }{{\overset{\oplus }{\mathop{NH}}\,}_{4}}(III)\,\,and\,\text{ }N{{H}_{3}}(IV)\]

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