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Shape of Trimethylamine - Class 12 PDF Download
The shape of trimethyl amine is:a)Octahedralb)Tetrahedralc)Bent shaped)PyramidalCorrect answer is option 'D'. Can you explain this answer?
Ref: https://edurev.in/question/512644/The-shape-of-trimethyl-amine-isa-Octahedralb-Tetrahedralc-Bent-shaped-PyramidalCorrect-answer-is-opt
It's a colourless liquid with a boiling point around 3.5°C, compared with the higher melting point of 224-226°C for the more polar Me3NO, which presumably has dipole-dipole intermolecular forces. Trimethylamine is a base, like ammonia. Also like ammonia, it has a trigonal pyramidal structure. The C-N-C bond angle is 110.9°, compared with 107.2° in NH3, presumably due to greater repulsions between the methyl groups. This angle is reduced to 109.0° in Me3NO. 
FAQs on Shape of Trimethylamine - Class 12
| 1. What is the shape of trimethylamine? |  |
Ans. Trimethylamine (N(CH3)3) has a pyramidal shape. The nitrogen atom is sp3 hybridized and forms three sigma bonds with three methyl groups, while the fourth electron pair is a lone pair, causing the pyramidal shape.
| 2. How is the shape of trimethylamine determined? | |
Ans. The shape of trimethylamine is determined by the electron pair repulsion theory (VSEPR). According to VSEPR theory, the electron pairs around the central atom repel each other and try to get as far apart as possible, resulting in the pyramidal shape of trimethylamine.
| 3. What are the bond angles in trimethylamine? | |
Ans. The bond angles in trimethylamine are approximately 107 degrees. This angle is slightly less than the ideal tetrahedral angle of 109.5 degrees due to the repulsion between the lone pair of electrons and the bonding electron pairs.
| 4. What are the properties of trimethylamine? | |
Ans. Trimethylamine is a colorless gas with a strong, fishy odor. It is soluble in water and forms a weak base. It is highly flammable and can form explosive mixtures with air. Trimethylamine is commonly used in the synthesis of various organic compounds and as a gas odorant.
| 5. Is trimethylamine harmful to human health? | |
Ans. Trimethylamine can be harmful to human health if inhaled, ingested, or exposed to the skin in high concentrations. It can cause irritation to the respiratory system, eyes, and skin. Prolonged or repeated exposure may result in more serious health effects. It is important to handle trimethylamine with proper precautions and follow safety guidelines.
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Jan 16, 2025
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