Organic Basics — Set 3
Chemistry · कार्बनिक रसायन · Questions 21–30 of 50
The conversion of alcohols into alkenes using concentrated sulfuric acid is an example of?
Correct Answer: B. Dehydration
• **Dehydration** = Dehydration involves the removal of a water molecule from the alcohol structure. • (Contextual detail from explanation) • 💡 Wrong-option analysis: A: Reduction; C: Substitution; D: Addition
Which organic compound is used as a refrigerant under the name Freon?
Correct Answer: D. Chlorofluorocarbon
• **Chlorofluorocarbon** = Chlorofluorocarbons (CFCs) were widely used as refrigerants and aerosol propellants. • (Contextual detail from explanation) • 💡 Wrong-option analysis: A: Iodoform; B: Chloroform; C: Carbon tetrachloride
The main constituent of cotton is?
Correct Answer: A. Cellulose
• **Cellulose** = Cotton fibers consist of nearly 90% cellulose. • (Contextual detail from explanation) • 💡 Wrong-option analysis: B: Starch; C: Fat; D: Protein
Which of the following is used in the manufacturing of non-stick cookware?
Correct Answer: C. Teflon
• **Teflon** = Teflon is the brand name for polytetrafluoroethylene (PTFE). • (Contextual detail from explanation) • 💡 Wrong-option analysis: A: Bakelite; B: Polystyrene; D: PVC
Which organic acid is responsible for the souring of milk?
Correct Answer: B. Lactic acid
• **Lactic acid** = Lactic acid is produced when bacteria ferment the lactose sugar found in milk. • (Contextual detail from explanation) • 💡 Wrong-option analysis: A: Citric acid; C: Tartaric acid; D: Oxalic acid
What is the primary organic compound in the 'spirit' used by doctors for cleaning wounds?
Correct Answer: B. Ethanol
• **Ethanol** = Ethanol acts as an effective antiseptic by denaturing the proteins of microbes. • (Contextual detail from explanation) • 💡 Wrong-option analysis: A: Propanol; C: Acetone; D: Methanol
Which hydrocarbon is used as a fuel in oxy-acetylene torches for welding?
Correct Answer: B. Ethyne
• **Ethyne** = Ethyne, also known as acetylene, burns in pure oxygen to produce an extremely hot flame. • **3000** — This flame temperature can reach over 3000 degrees Celsius • 💡 Wrong-option analysis: A: Propene; C: Ethane; D: Methane
The chemical name of the compound used as a solvent in nail polish removers is?
Correct Answer: A. Acetone
• **Acetone** = Acetone is a highly effective solvent for dissolving nitrocellulose used in nail polish. • (Contextual detail from explanation) • 💡 Wrong-option analysis: B: Ethyl acetate; C: Ethanol; D: Benzene
Which of the following is a thermosetting plastic?
Correct Answer: D. Bakelite
• **Bakelite** = Bakelite is a thermosetting polymer that becomes permanently hard after being molded. • **first** — It was the first plastic made from synthetic components • 💡 Wrong-option analysis: A: PVC; B: Nylon; C: Polythene
Which organic acid is found in ant stings and causes a burning sensation?
Correct Answer: B. Formic acid
• **Formic acid** = Formic acid is the simplest carboxylic acid and is secreted by ants for defense. • (Contextual detail from explanation) • 💡 Wrong-option analysis: A: Malic acid; C: Oxalic acid; D: Acetic acid