Bakelite (Polyoxybenzylmethylenglycolanhydride) is a thermosetting plastic developed by Leo Baekeland in 1907. It was one of the first plastics made from synthetic components. It is known for its excellent electrical insulation and heat-resistant properties, making it suitable for handles of cookware, electrical fittings, and other applications requiring heat resistance.
The handle of pressure cookers is made of plastic because it should be made non-conductor of heat. The plastic used there is the first man- made plastic, which is :
Asked in UPSC CDS 1 2016 · Topic: Polymer (Synthesis, properties, and applications of common thermosets (e.g., Phenol-formaldehyde, Epoxy resins))
More Chemistry questions
- Which one of the following compounds is used for the synthesis of silicones?
- Which one of the following is used as a binder in paints ?
- Which is the stronger acid than phenol due to the presence of three same electron with drawing groups (i) O-Toluic Acid (ii) Benzoic acid (iii) Salicylic Acid (iv) Picric Acid
- Which of the following polymers is used to make electrical switches ?
- Which is the strongest acid?
- Which of the following statements about carboxylic acids is/are correct? 1. Simple aliphatic carboxylic acids are soluble in water. 2. Higher carboxylic acids are practically insoluble in water. 3. The acidity of a carboxylic acid depends on the number of carbon atoms present in the hydrocarbon chain. Select the correct answer using the code given below.
- Simple aliphatic carboxylic acids (e.g., formic acid, acetic acid) are soluble in water because the polar carboxyl group (-COOH) can form hydrogen bonds with water molecules. 2. As the hydrocarbon chain length increases in higher carboxylic acids, the nonpolar hydrophobic part dominates, making them practically insoluble in water. 3. The acidity of a carboxylic acid is related to the stability of its conjugate base (carboxylate ion). Alkyl groups are electron-donating, which destabilizes the negative charge on the carboxylate ion. Therefore, increasing the number of carbon atoms (length of the alkyl chain) generally decreases the acidity of aliphatic carboxylic acids. The hydrocarbon chain's size does influence acidity. 4. Assertion (A): Formic acid is a stronger acid than acetic acid. Reason (R): Formic acid is an organic acid.
- The correct order of increasing acidic strength of the following acids is - (1) $CCl_3‐ COOH > CF_3COOH > NO_2-CH_2COOH > NC-CH_2COOH$ (2) $CF_3COOH > CCl_3‐ COOH > NO_2-CH_2COOH > NC-CH_2‐ COOH$ (3) $NC-CH_2COOH > NO_2-CH_2‐ COOH > CF_3COOH > CCl_3COOH$ (4) $NO_2-CH_2COOH > CCl_3COOH > CF_3‐ COOH > NC-CH_2COOH$ (5) Question not attempted