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Q.

Statement I : Diamagnetic C₂ molecule have been detected in vapour phase in which double bond consists of both pi bonds
Statement II : In C₂ molecule four electrons are present in two pi molecular orbitals

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a

Both Statement I and Statement II are false

b

Statement I is false and Statement II is true

c

Statement I is true and Statement II is false

d

Both Statement I and Statement II are true

answer is A.

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Detailed Solution

C₂ ⇒ Total electrons :- 6 + 6 = 12 [< 14e^-]

\large \sigma 1{s^2}\;{\sigma ^*}1{s^2}\;\sigma 2{s^2}\;\sigma {2^*}{s^2}\;\boxed{\begin{array}{*{20}{c}} {\pi 2{p_x}^2} \\ {\pi 2{p_y}^2} \end{array}}\;\sigma 2p{z^0}\;\begin{array}{*{20}{c}} {{\pi ^*}2{p_x}^0} \\ {{\pi ^*}2{p_y}^0} \end{array}{\sigma ^*}2{p_z}^0\

The two π - bonds in C₂ molecule are formed by the involvement of two π-molecular orbitals.

$∴$ Statement I and Statement II are correct. (true)

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Statement I : Diamagnetic C2 molecule have been detected in vapour phase in which double bond consists of both pi bonds Statement II : In C2 molecule four electrons are present in two pi molecular orbitals