Short Q/A Hydrocarbons - Students Free Notes

Explain why a systematic method of naming chemical compounds is necessary?

A systematic method of naming chemical compounds ensures clarity and avoids confusion. It helps in the precise identification of compounds, facilitating effective communication among scientists, ensuring the correct structure and properties are understood, and avoiding ambiguities in practical applications.   Related Questions: Give three examples of unsaturated hydrocarbons. How can you differentiate ethane from ethene? … Read more

Write a chemical equation to show the preparation of ethyne from dehalogenation of 1,2-dihalide and a tetrahalide

Dehalogenation of 1,2-Dihalide: CH₂Cl-CH₂Cl → C₂H₂ + 2HCl (In the presence of Zn and heat) Dehalogenation of Tetrahalide: C₂Cl₄ → C₂H₂ + 2Cl₂ (In the presence of Zn and heat)   Related Questions: Give three examples of unsaturated hydrocarbons. How can you differentiate ethane from ethene? What do you mean by dehydration reaction? Give one … Read more

Write a chemical equation to show the preparation of ethene from dehydration of an alcohol and dehydrohalogenation of alkyl halides:

Dehydration of Alcohol: C₂H₅OH → C₂H₄ + H₂O (In the presence of concentrated H₂SO₄) Dehydrohalogenation of Alkyl Halide: C₂H₅Cl → C₂H₄ + HCl (In the presence of alcoholic KOH) Related Questions: Give three examples of unsaturated hydrocarbons. How can you differentiate ethane from ethene? What do you mean by dehydration reaction? Give one example. Draw … Read more

Write a chemical equation to show the preparation of an alkane from an alkene and an alkyne:

Alkene to Alkane: C₂H₄ + H₂ → C₂H₆ (Hydrogenation) Alkyne to Alkane: C₂H₂ + 2H₂ → C₂H₆ (Hydrogenation) Related Questions: Give three examples of unsaturated hydrocarbons. How can you differentiate ethane from ethene? What do you mean by dehydration reaction? Give one example. Draw structural formulas of an alkane, an alkene, and an alkyne containing … Read more

What is the effect of adding bromine water to an alkene?

When bromine water is added to an alkene, the brown color of the bromine water disappears, indicating that the alkene undergoes addition reaction with bromine (forming a dihaloalkane). Related Questions: Give three examples of unsaturated hydrocarbons. Draw electron dot and cross structure for ethene. How can you differentiate ethane from ethene? What do you mean … Read more

What is the main difference between saturated and unsaturated hydrocarbons?

Saturated hydrocarbons have only single bonds between carbon atoms (e.g., alkanes), whereas unsaturated hydrocarbons have double or triple bonds between carbon atoms (e.g., alkenes and alkynes).   Related Questions: Give three examples of unsaturated hydrocarbons. How can you differentiate ethane from ethene? What do you mean by dehydration reaction? Give one example. Draw structural formulas … Read more

How is ethene prepared from ethanol?

Ethene can be prepared from ethanol by dehydration. In the presence of concentrated sulfuric acid (H₂SO₄), ethanol (C₂H₅OH) undergoes dehydration to form ethene (C₂H₄) and water (H₂O). Equation: C₂H₅OH → C₂H₄ + H₂O Related Questions: Give three examples of unsaturated hydrocarbons. How can you differentiate ethane from ethene? What do you mean by dehydration reaction? … Read more

What is the general formula for alkenes?

The general formula for alkenes is CₙH₂ₙ.   Related Questions: Give three examples of unsaturated hydrocarbons. How can you differentiate ethane from ethene? What do you mean by dehydration reaction? Give one example. Draw structural formulas of an alkane, an alkene, and an alkyne containing five carbon atoms. How is ethene prepared from ethanol? What … Read more