JEE Main 2026 · 4 Apr · Shift 2 · Chemistry Q53

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ChemistrySingle correct+4 / -1Question 53 of 75

Which of the following pictorial diagram most correctly represents the π* (π-antibonding) molecular orbital between two atoms if the internuclear axis is taken to be in the z-direction (z-axis →)?

One large shaded lobe above and one unshaded lobe below, both enclosing the two nuclei: the π bonding orbital.

Two side-by-side p orbitals perpendicular to the axis, each with its upper lobe shaded and lower lobe unshaded (same phases facing each other).

Two side-by-side p orbitals perpendicular to the axis with opposite phases: left orbital shaded above, right orbital shaded below, giving a node between the nuclei.

Two p orbitals along the internuclear axis, end to end, lobes alternating shaded and unshaded: a σ-type combination.

Answer and worked solution

Official answer: C

π:* two p orbitals perpendicular to the z-axis combine side by side with opposite phases, leaving a nodal plane between the nuclei, as in (C).

(A) is the π bonding orbital.
(B) has like phases facing each other.
(D) is a σ-type (end-on) combination.

(C)

Topics:Molecular orbital theory

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JEE Main 2026 · 4 Apr · Shift 2, Chemistry question 53