NEET 2024 — Chemistry solution

NEET2024Chemistry

Arrange the following elements in increasing order of first ionization enthalpy: Li, Be, B, C, N

Choose the correct answer from the options given below:

A
Li $<$ Be $<$ C $<$ B $<$ N
B
Li $<$ Be $<$ N $<$ B $<$ C
C
Li $<$ Be $<$ B $<$ C $<$ N
D
Li $<$ B $<$ Be $<$ C $<$ N

Solution

Across period 2, IE generally rises. But Be (1s $^{2}$ 2s $^{2}$ , fully filled 2s) has a higher IE than B (1s $^{2}$ 2s $^{2}$ 2p $^{1}$ ), which loses a 2p electron more easily.

So the order is Li $<$ B $<$ Be $<$ C $<$ N (N is also above C due to half-filled 2p $^{3}$ stability).

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