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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyI: | In an organic compound, when inductive and electromeric effects operate in opposite directions, the inductive effect predominates. |
II: | Hyperconjugation is observed in o-xylene. |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyAssertion (A): | Chlorine is an electron-withdrawing group, yet it exhibits ortho- and para-directing behavior in electrophilic aromatic substitution. |
Reason (R): | Inductive effect of chlorine destabilises the intermediate carbocation formed during the electrophilic substitution, however due to the more pronounced resonance effect, the halogen stabilises the carbocation at ortho and para positions. |
1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
3. | (A) is True but (R) is False. |
4. | (A) is False but (R) is True. |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyA tertiary butyl carbocation is more stable than a secondary butyl carbocation because-
1. + R effect of groups
2. R effect of CH3 groups
3. Hyperconjugation
4. l effect of CH3 groups
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe correct order with respect to –I effect of the substituents is:
(R = alkyl)
1. –NH2 > –OR < –F
2. –NR2 < –OR < –F
3. –NH2 > –OR > –F
4. –NR2 > –OR > –F
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe most stable carbocation among the following is:
1. | 2. | ||
3. | 4. |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyHyperconjugation occurs among the following compounds:
1. | I only | 2. | II only |
3. | III only | 4. | I and III |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhat is the correct sequence of acidity for the following compounds?
1. | CH3COOH > BrCH2COOH > ClCH2COOH > FCH2COOH |
2. | FCH2COOH > CH3COOH > BrCH2COOH > ClCH2COOH |
3. | BrCH2COOH > ClCH2COOH > FCH2COOH > CH3COOH |
4. | FCH2COOH > ClCH2COOH > BrCH2COOH > CH3COOH |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhich amongst the following is the most stable carbocation:
1. | 2. | ||
3. | 4. |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyPolarisation of electrons in acrolein may be written as:
1.
2.
3.
4.
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology