What is the molecular geometry around the N atom in the molecule depicted?

Question

BlackTom AI · Accepted Answer

The question asks for the molecular geometry around the nitrogen (N) atom in the depicted molecule. Since the image is not described here, we rely on the common scenario for N in many organic or inorganic compounds where N has three sigma bonds and one lone pair.

Option 1: trigonal planar. This geometry arises when the nitrogen has three sigma bonds and no lone pairs, giving three electron domains arranged in a plane with 120° angles. If a lone pair were present (as is typical for N in many neutral amines), trigonal planar would be incorrect because lone pairs count as electron domains and alter the geometry.

Option 2: trigonal pyramid. This is the geometry that results when nitrogen has four electron domains: three bonds and one lone pair. The three bonding pairs form a base (a triangle), while the lone pair occupies the fourth position, producing a pyramidal shape with bond angles slightly less than 109.5° (often near 107° in typical amines). This matches the common case of N with three bonds and a lone pair, which is a very typical scenario for N-containing molecules.

Option 3: tetrahedral. This geometry occurs when there are four bonds and no lone pairs, giving a symmetrical tetrahedral arrangement of four ligands around N. If N had four bonds, this would be tetrahedral, but that would imply four substituents attached to N and no lone pair, which is less common for neutral N in many simple compounds and contradicts the typical three-bond-one-lone-pair case.

Option 4: bent. The bent (or V-shaped) geometry describes molecules like water, where there are two bonding pairs and two lone pairs around the central atom, leading to a bent shape. For nitrogen with three bonds and one lone pair, the arrangement is not bent in the same sense; the expected geometry is trigonal pyramidal, not bent, unless the bonding pattern differs (e.g., only two bonds).

In summary, given the standard scenario for nitrogen with three σ bonds and one lone pair, the electron-domain geometry is tetrahedral, but the molecular geometry is trigonal pyramidal. The other options are inconsistent with having three bonds plus a lone pair: trigonal planar would require no lone pair, tetrahedral would require four bonds, and bent would require two bonds with two lone pairs. Therefore, the most plausible molecular geometry around N in this context is trigonal pyramid.

What is the molecular geometry around the N atom in the molecule depicted? 单项选择题

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