CBSE Class 12 Chemistry 2023 Outside Delhi Set 1 Solved Paper
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Question : 27 of 35
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Answer any three of the following:
(a) Which isomer of gives a single monochloro compound in bright sunlight?
(b) Arrange the following compounds in increasing order of reactivity towards reaction:
2-Bromopentane, 1-Bromopentane, 2-Bromo-2methylbutane
(c) Why p-dichlorobenzene has higher melting point than those of ortho and meta-isomers?
(d) Identify A and B in the following:
(a) Which isomer of gives a single monochloro compound in bright sunlight?
(b) Arrange the following compounds in increasing order of reactivity towards reaction:
2-Bromopentane, 1-Bromopentane, 2-Bromo-2methylbutane
(c) Why p-dichlorobenzene has higher melting point than those of ortho and meta-isomers?
(d) Identify A and B in the following:
Solution:
(a) The hydrocarbon is either alkene or cycloalkane. It does not react with chlorine in dark. Hence it cannot be alkene. Hence, it is cycloalkene. The compound is cyclopentane.
(b) 2-Bromo-2-methylbutane 2-Bromopentane -Bromopentane.
(c) It is due to greater symmetry of para-isomer that fits in the crystal better as compared to o & m-isomers.
Cyclopentane
(b) 2-Bromo-2-methylbutane 2-Bromopentane -Bromopentane.
(c) It is due to greater symmetry of para-isomer that fits in the crystal better as compared to o & m-isomers.
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