NEET Test Series from KOTA - 10 Papers In MS WORD
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CHXI13:HYDROCARBONS
318224
Number of anti aromatic compound in the following compound is ____.
1 2
2 3
3 5
4 4
Explanation:
The molecules, which have \(4 n \pi\) electrons are anti-aromatic compounds. (a) has 4nπ–electrons (b) has \(6+2\) (from oxygen atom) \(=8 \pi\) electrons (c) has \(6 \pi\)-electrons and one \(\mathrm{C}\)-atom is \({\rm{s}}{{\rm{p}}^{\rm{3}}}\) hybridised hence it is non-aromatic. (d) is aromatic (e) has 4π–electrons as available lone pair with \(\mathrm{N}\) - atom will not be delocalized in this conjugated system. (f) has \(12 \pi\)-electrons. Hence, (a), (b), (e) and (f) are anti-aromatic.
CHXI13:HYDROCARBONS
318225
Assertion : Cycloheptatriene contains \(6 \pi\) electrons but it is not aromatic. Reason : Aromatic compounds follow Huckel's rule.
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:
Cycloheptatriene, contains \({\text{6}}\pi \) electrons. Huckel's rule. \((4 n+2) \pi e^{-}\). But it is not aromatic because \(6 \pi\) electrons are only localised over 6 carbon atoms and not all over the seven carbon atoms of the ring (no conjugation). So, option (2) is correct.
CHXI13:HYDROCARBONS
318226
Which of the following compounds will show highest dipole moment? (I) (II) (III) (IV)
1 I
2 II
3 III
4 IV
Explanation:
A dipolar resonance structure has aromatic character in the ring and would be expected to make a major contribution to the overall structure.
JEE - 2017
CHXI13:HYDROCARBONS
318227
Electrophile that participates in nitration of benzene is
318224
Number of anti aromatic compound in the following compound is ____.
1 2
2 3
3 5
4 4
Explanation:
The molecules, which have \(4 n \pi\) electrons are anti-aromatic compounds. (a) has 4nπ–electrons (b) has \(6+2\) (from oxygen atom) \(=8 \pi\) electrons (c) has \(6 \pi\)-electrons and one \(\mathrm{C}\)-atom is \({\rm{s}}{{\rm{p}}^{\rm{3}}}\) hybridised hence it is non-aromatic. (d) is aromatic (e) has 4π–electrons as available lone pair with \(\mathrm{N}\) - atom will not be delocalized in this conjugated system. (f) has \(12 \pi\)-electrons. Hence, (a), (b), (e) and (f) are anti-aromatic.
CHXI13:HYDROCARBONS
318225
Assertion : Cycloheptatriene contains \(6 \pi\) electrons but it is not aromatic. Reason : Aromatic compounds follow Huckel's rule.
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:
Cycloheptatriene, contains \({\text{6}}\pi \) electrons. Huckel's rule. \((4 n+2) \pi e^{-}\). But it is not aromatic because \(6 \pi\) electrons are only localised over 6 carbon atoms and not all over the seven carbon atoms of the ring (no conjugation). So, option (2) is correct.
CHXI13:HYDROCARBONS
318226
Which of the following compounds will show highest dipole moment? (I) (II) (III) (IV)
1 I
2 II
3 III
4 IV
Explanation:
A dipolar resonance structure has aromatic character in the ring and would be expected to make a major contribution to the overall structure.
JEE - 2017
CHXI13:HYDROCARBONS
318227
Electrophile that participates in nitration of benzene is
318224
Number of anti aromatic compound in the following compound is ____.
1 2
2 3
3 5
4 4
Explanation:
The molecules, which have \(4 n \pi\) electrons are anti-aromatic compounds. (a) has 4nπ–electrons (b) has \(6+2\) (from oxygen atom) \(=8 \pi\) electrons (c) has \(6 \pi\)-electrons and one \(\mathrm{C}\)-atom is \({\rm{s}}{{\rm{p}}^{\rm{3}}}\) hybridised hence it is non-aromatic. (d) is aromatic (e) has 4π–electrons as available lone pair with \(\mathrm{N}\) - atom will not be delocalized in this conjugated system. (f) has \(12 \pi\)-electrons. Hence, (a), (b), (e) and (f) are anti-aromatic.
CHXI13:HYDROCARBONS
318225
Assertion : Cycloheptatriene contains \(6 \pi\) electrons but it is not aromatic. Reason : Aromatic compounds follow Huckel's rule.
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:
Cycloheptatriene, contains \({\text{6}}\pi \) electrons. Huckel's rule. \((4 n+2) \pi e^{-}\). But it is not aromatic because \(6 \pi\) electrons are only localised over 6 carbon atoms and not all over the seven carbon atoms of the ring (no conjugation). So, option (2) is correct.
CHXI13:HYDROCARBONS
318226
Which of the following compounds will show highest dipole moment? (I) (II) (III) (IV)
1 I
2 II
3 III
4 IV
Explanation:
A dipolar resonance structure has aromatic character in the ring and would be expected to make a major contribution to the overall structure.
JEE - 2017
CHXI13:HYDROCARBONS
318227
Electrophile that participates in nitration of benzene is
318224
Number of anti aromatic compound in the following compound is ____.
1 2
2 3
3 5
4 4
Explanation:
The molecules, which have \(4 n \pi\) electrons are anti-aromatic compounds. (a) has 4nπ–electrons (b) has \(6+2\) (from oxygen atom) \(=8 \pi\) electrons (c) has \(6 \pi\)-electrons and one \(\mathrm{C}\)-atom is \({\rm{s}}{{\rm{p}}^{\rm{3}}}\) hybridised hence it is non-aromatic. (d) is aromatic (e) has 4π–electrons as available lone pair with \(\mathrm{N}\) - atom will not be delocalized in this conjugated system. (f) has \(12 \pi\)-electrons. Hence, (a), (b), (e) and (f) are anti-aromatic.
CHXI13:HYDROCARBONS
318225
Assertion : Cycloheptatriene contains \(6 \pi\) electrons but it is not aromatic. Reason : Aromatic compounds follow Huckel's rule.
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:
Cycloheptatriene, contains \({\text{6}}\pi \) electrons. Huckel's rule. \((4 n+2) \pi e^{-}\). But it is not aromatic because \(6 \pi\) electrons are only localised over 6 carbon atoms and not all over the seven carbon atoms of the ring (no conjugation). So, option (2) is correct.
CHXI13:HYDROCARBONS
318226
Which of the following compounds will show highest dipole moment? (I) (II) (III) (IV)
1 I
2 II
3 III
4 IV
Explanation:
A dipolar resonance structure has aromatic character in the ring and would be expected to make a major contribution to the overall structure.
JEE - 2017
CHXI13:HYDROCARBONS
318227
Electrophile that participates in nitration of benzene is
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