Chemistry - Study Mode

[#86] Wax used for making candle is chemically a mixture of
Correct Answer

(A) Aliphatic hydrocarbons

Explanation

Solution: An aliphatic compound is a hydrocarbon compound containing carbon and hydrogen joined together in straight chains, branched trains or non-aromatic rings. Waxes are a class of chemical compounds that are plastic (malleable) near ambient temperatures. Characteristically, they melt above 45 degree C (113 degree F) to give a low viscosity liquid. Waxes are insoluble in water but soluble in organic, non-polar solvents. All waxes are organic compounds, both synthetic and naturally occurring. Waxes are organic compounds that characteristically consist of long alkyl chains. Natural waxes are typically esters of fatty acids and long chain alcohols. Synthetic waxes are longchain hydrocarbons lacking functional groups. Waxes are biosynthesized by many plants and animals. They typically consist of several components, including wax esters, wax acids, wax alcohols, and hydrocarbons. Wax esters are typically derived from a variety of carboxylic acids and a variety of fatty alcohols.

[#87] Adding Cl 2 to benzene in the presence of AlCl 3 is an example of :
Correct Answer

(B) Substitution reaction

Explanation

Solution: Adding Cl 2 to benzene in the presence of AlCl 3 is an example of substitution reaction.

[#88] Benzene cannot undergo :
Correct Answer

(C) Elimination

Explanation

Solution: Benzene can not undergo elimination reaction.

[#89] Which one is the simplest aromatic hydrocarbon?
Correct Answer

(B) Benzene

Explanation

Solution: Benzene, C 6 H 6 , is the simplest aromatic hydrocarbon and was recognized as the first aromatic hydrocarbon, with the nature of its bonding first being recognized by Kekulé in the 19th century. Each carbon atom in the hexagonal cycle has four electrons to share.

[#90] In an oxygen molecule, two atoms are united by
Correct Answer

(B) Two bonds

Explanation

Solution: Two oxygen atoms can both achieve stable structures by sharing two pairs of electrons as in the diagram. Two electrons of each of the atom in the oxygen molecule make the double bond with each other. The double bond is shown conventionally by two lines joining the atoms. Each line represents one pair of shared electrons.