NEET Test Series from KOTA - 10 Papers In MS WORD
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CHXI13:HYDROCARBONS
317917
Assertion : Straight chain alkanes have very low octane number. Reason : Quality of gasoline is measured in terms of octane number.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
Explanation:
Straight chain alkanes have very low octane number because as the length of the chain increases, octane number further decreases. The octane number \((\mathrm{ON})\) is a measure of the knock resistance of gasoline. It defines a numerical value from 0 to 100 , and describes the behavior of the fuel in the engine during combustion. So, option (2) is correct.
CHXI13:HYDROCARBONS
317918
Assertion : The octane number of branched chain hydrocarbons is higher than that of unbranched chain hydrocarbons. Reason : The branched chain hydrocarbons are more volatile than unbranched chain hydrocarbons.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
Explanation:
Octane no. increases with branching. Branched alkanes have a number of tertiary carbon-hydrogen bonds. Such hydrogens are easily abstracted in the combustion chain reactions, and speed up the propagation of the explosive events that take place in the piston chamber. Straight chain "normal" alkanes contain only primary and secondary groups which are given out slowly. Straight chains have higher boiling points due to large surface area. So, option (2) is correct.
CHXI13:HYDROCARBONS
317919
Octane number can be changed by
1 isomerisation
2 alkylation
3 cyclisation
4 All of these
Explanation:
The octane number of fuel can be improved by increasing the percentage of branched chain alkanes, alkenes and aromatic hydrocarbon. Thus, octane number can be changed by isomerisation, alkylation and aromatisation (cyclisation).
CHXI13:HYDROCARBONS
317920
Which isomer of \(\mathrm{C}_{6} \mathrm{H}_{14}\) has highest boiling point?
1 Hexane
2 3-Methylpentane
3 2-Methylpentane
4 2,2-Dimethylbutane
Explanation:
Straight chain isomer, i.e., Hexane has highest boiling point as compared to branched chain isomers of \(\mathrm{C}_{6} \mathrm{H}_{14}\).
317917
Assertion : Straight chain alkanes have very low octane number. Reason : Quality of gasoline is measured in terms of octane number.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
Explanation:
Straight chain alkanes have very low octane number because as the length of the chain increases, octane number further decreases. The octane number \((\mathrm{ON})\) is a measure of the knock resistance of gasoline. It defines a numerical value from 0 to 100 , and describes the behavior of the fuel in the engine during combustion. So, option (2) is correct.
CHXI13:HYDROCARBONS
317918
Assertion : The octane number of branched chain hydrocarbons is higher than that of unbranched chain hydrocarbons. Reason : The branched chain hydrocarbons are more volatile than unbranched chain hydrocarbons.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
Explanation:
Octane no. increases with branching. Branched alkanes have a number of tertiary carbon-hydrogen bonds. Such hydrogens are easily abstracted in the combustion chain reactions, and speed up the propagation of the explosive events that take place in the piston chamber. Straight chain "normal" alkanes contain only primary and secondary groups which are given out slowly. Straight chains have higher boiling points due to large surface area. So, option (2) is correct.
CHXI13:HYDROCARBONS
317919
Octane number can be changed by
1 isomerisation
2 alkylation
3 cyclisation
4 All of these
Explanation:
The octane number of fuel can be improved by increasing the percentage of branched chain alkanes, alkenes and aromatic hydrocarbon. Thus, octane number can be changed by isomerisation, alkylation and aromatisation (cyclisation).
CHXI13:HYDROCARBONS
317920
Which isomer of \(\mathrm{C}_{6} \mathrm{H}_{14}\) has highest boiling point?
1 Hexane
2 3-Methylpentane
3 2-Methylpentane
4 2,2-Dimethylbutane
Explanation:
Straight chain isomer, i.e., Hexane has highest boiling point as compared to branched chain isomers of \(\mathrm{C}_{6} \mathrm{H}_{14}\).
317917
Assertion : Straight chain alkanes have very low octane number. Reason : Quality of gasoline is measured in terms of octane number.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
Explanation:
Straight chain alkanes have very low octane number because as the length of the chain increases, octane number further decreases. The octane number \((\mathrm{ON})\) is a measure of the knock resistance of gasoline. It defines a numerical value from 0 to 100 , and describes the behavior of the fuel in the engine during combustion. So, option (2) is correct.
CHXI13:HYDROCARBONS
317918
Assertion : The octane number of branched chain hydrocarbons is higher than that of unbranched chain hydrocarbons. Reason : The branched chain hydrocarbons are more volatile than unbranched chain hydrocarbons.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
Explanation:
Octane no. increases with branching. Branched alkanes have a number of tertiary carbon-hydrogen bonds. Such hydrogens are easily abstracted in the combustion chain reactions, and speed up the propagation of the explosive events that take place in the piston chamber. Straight chain "normal" alkanes contain only primary and secondary groups which are given out slowly. Straight chains have higher boiling points due to large surface area. So, option (2) is correct.
CHXI13:HYDROCARBONS
317919
Octane number can be changed by
1 isomerisation
2 alkylation
3 cyclisation
4 All of these
Explanation:
The octane number of fuel can be improved by increasing the percentage of branched chain alkanes, alkenes and aromatic hydrocarbon. Thus, octane number can be changed by isomerisation, alkylation and aromatisation (cyclisation).
CHXI13:HYDROCARBONS
317920
Which isomer of \(\mathrm{C}_{6} \mathrm{H}_{14}\) has highest boiling point?
1 Hexane
2 3-Methylpentane
3 2-Methylpentane
4 2,2-Dimethylbutane
Explanation:
Straight chain isomer, i.e., Hexane has highest boiling point as compared to branched chain isomers of \(\mathrm{C}_{6} \mathrm{H}_{14}\).
317917
Assertion : Straight chain alkanes have very low octane number. Reason : Quality of gasoline is measured in terms of octane number.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
Explanation:
Straight chain alkanes have very low octane number because as the length of the chain increases, octane number further decreases. The octane number \((\mathrm{ON})\) is a measure of the knock resistance of gasoline. It defines a numerical value from 0 to 100 , and describes the behavior of the fuel in the engine during combustion. So, option (2) is correct.
CHXI13:HYDROCARBONS
317918
Assertion : The octane number of branched chain hydrocarbons is higher than that of unbranched chain hydrocarbons. Reason : The branched chain hydrocarbons are more volatile than unbranched chain hydrocarbons.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
Explanation:
Octane no. increases with branching. Branched alkanes have a number of tertiary carbon-hydrogen bonds. Such hydrogens are easily abstracted in the combustion chain reactions, and speed up the propagation of the explosive events that take place in the piston chamber. Straight chain "normal" alkanes contain only primary and secondary groups which are given out slowly. Straight chains have higher boiling points due to large surface area. So, option (2) is correct.
CHXI13:HYDROCARBONS
317919
Octane number can be changed by
1 isomerisation
2 alkylation
3 cyclisation
4 All of these
Explanation:
The octane number of fuel can be improved by increasing the percentage of branched chain alkanes, alkenes and aromatic hydrocarbon. Thus, octane number can be changed by isomerisation, alkylation and aromatisation (cyclisation).
CHXI13:HYDROCARBONS
317920
Which isomer of \(\mathrm{C}_{6} \mathrm{H}_{14}\) has highest boiling point?
1 Hexane
2 3-Methylpentane
3 2-Methylpentane
4 2,2-Dimethylbutane
Explanation:
Straight chain isomer, i.e., Hexane has highest boiling point as compared to branched chain isomers of \(\mathrm{C}_{6} \mathrm{H}_{14}\).
