Year :
2009
Title :
Chemistry
Exam :
JAMB Exam
Paper 1 | Objectives
41 - 50 of 50 Questions
| # | Question | Ans |
|---|---|---|
| 41. |
Which of the following molecules has two other positional isomers? A. CH3CH2Br B. CH3CHBrCH3 C. CBr2F2 D. CH2CHBrCH2Br Detailed SolutionPositional isomers of C\(_3\)H\(_7\)Br : 1- bromo propane and 2- bromo propaneThere is an explanation video available below. |
|
| 42. |
Which of the following class of compounds can exist as dipolar ions in solution? A. Alkanoic acid B. Fatty acids C. Dialkanoic acids D. Amino acids |
|
| 43. |
Lucas reagent is used to test for? A. alkanes B. alkanoic acids C. alkanols D. amines Detailed SolutionLucas' reagent is a solution of anhydrous zinc chloride in concentrated hydrochloric acid. This solution is used to classify alcohols.There is an explanation video available below. |
|
| 44. |
A compound commonly used for sterilization and preservation of specimens and food is A. ethanol B. benzene C. ether D. ammonia |
|
| 45. |
An organic compound reacted with bromine water to give a colourless solution. The compound is probably an? A. alkene B. alkanal C. alkyl D. alkanone Detailed SolutionAlkenes react in the cold with pure liquid bromine, or with a solution of bromine in an organic solvent like tetrachloromethane. The double bond breaks, and a bromine atom becomes attached to each carbon. The bromine loses its original red-brown colour to give a colourless liquid.Alkynes also react with bromine, decolorising it though not as immediate as alkenes. There is an explanation video available below. |
|
| 46. |
Which of the following hydrocarbons is mainly used as fuel? A. Methylene B. Ethylene C. Methane D. Ethyne |
|
| 47. |
The molecular formula of a common organic laboratory anaesthetic is A. CHCl3 B. CHI3 C. CCl4 D. CHF3 |
|
| 48. |
The simplest branched-chain hydrocarbon is A. ethane B. ethene C. propane D. butane Detailed SolutionThe smallest branched alkane is isobutane. Notice that isobutane has the same molecular formula, C4H10, as n-butane but has a different structural formula.There is an explanation video available below. |
|
| 49. |
Organic molecules that have the suffix-ene are unsaturated hydrocarbons that have? A. a single bond B. a double bond C. a triple bond D. an ionic bond Detailed SolutionIn chemistry, an alkene is a hydrocarbon containing a carbon–carbon double bond. Alkene is often used as synonym of olefin, that is, any hydrocarbon containing one or more double bonds.There is an explanation video available below. |
|
| 50. |
If the relative atomic mass of an element is not a whole number, it can be deduced that the element is? A. Naturally radioactive B. abundant in nature C. a transition metal D. an isotopic mixture |
| 41. |
Which of the following molecules has two other positional isomers? A. CH3CH2Br B. CH3CHBrCH3 C. CBr2F2 D. CH2CHBrCH2Br Detailed SolutionPositional isomers of C\(_3\)H\(_7\)Br : 1- bromo propane and 2- bromo propaneThere is an explanation video available below. |
|
| 42. |
Which of the following class of compounds can exist as dipolar ions in solution? A. Alkanoic acid B. Fatty acids C. Dialkanoic acids D. Amino acids |
|
| 43. |
Lucas reagent is used to test for? A. alkanes B. alkanoic acids C. alkanols D. amines Detailed SolutionLucas' reagent is a solution of anhydrous zinc chloride in concentrated hydrochloric acid. This solution is used to classify alcohols.There is an explanation video available below. |
|
| 44. |
A compound commonly used for sterilization and preservation of specimens and food is A. ethanol B. benzene C. ether D. ammonia |
|
| 45. |
An organic compound reacted with bromine water to give a colourless solution. The compound is probably an? A. alkene B. alkanal C. alkyl D. alkanone Detailed SolutionAlkenes react in the cold with pure liquid bromine, or with a solution of bromine in an organic solvent like tetrachloromethane. The double bond breaks, and a bromine atom becomes attached to each carbon. The bromine loses its original red-brown colour to give a colourless liquid.Alkynes also react with bromine, decolorising it though not as immediate as alkenes. There is an explanation video available below. |
| 46. |
Which of the following hydrocarbons is mainly used as fuel? A. Methylene B. Ethylene C. Methane D. Ethyne |
|
| 47. |
The molecular formula of a common organic laboratory anaesthetic is A. CHCl3 B. CHI3 C. CCl4 D. CHF3 |
|
| 48. |
The simplest branched-chain hydrocarbon is A. ethane B. ethene C. propane D. butane Detailed SolutionThe smallest branched alkane is isobutane. Notice that isobutane has the same molecular formula, C4H10, as n-butane but has a different structural formula.There is an explanation video available below. |
|
| 49. |
Organic molecules that have the suffix-ene are unsaturated hydrocarbons that have? A. a single bond B. a double bond C. a triple bond D. an ionic bond Detailed SolutionIn chemistry, an alkene is a hydrocarbon containing a carbon–carbon double bond. Alkene is often used as synonym of olefin, that is, any hydrocarbon containing one or more double bonds.There is an explanation video available below. |
|
| 50. |
If the relative atomic mass of an element is not a whole number, it can be deduced that the element is? A. Naturally radioactive B. abundant in nature C. a transition metal D. an isotopic mixture |