In gaseous triethyl amine the "$-\mathrm{C}-\mathrm{N}-\mathrm{C}-$" bond angle is ______ degree.

JEE Main · 2021 · 27 Jul 2021 · Shift 1 · Chemical Bonding and Molecular Structure

In gaseous triethyl amine the "

- C - N - C -

" bond angle is ______ degree.

Answer: 108

Solution

Triethylamine, (C₂H₅)₃N, has a nitrogen atom with three ethyl groups and one lone pair. The geometry around nitrogen is tetrahedral (sp³ hybridization), but the molecular shape is trigonal pyramidal due to the lone pair.

In a perfect tetrahedral geometry, the bond angle would be 109.5°. However, the lone pair-bond pair repulsion is greater than bond pair-bond pair repulsion, which compresses the C-N-C bond angles slightly below 109.5°.

For triethylamine, the C-N-C bond angle is approximately 108°.

Answer: 108

JEE Main · 2021 · 27 Jul 2021 · Shift 1 · Integer answer

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