01. Resonance
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GENERAL ORGANIC CHEMISTRY

231669 Which one of the following statements is not true about resonance?

1 The resonating structures are hypothetical
2 The unpaired electrons in various structures are same
3 Hybrid structure is least stable
4 Hybrid structure is least energetic
Assam CEE-2014
GENERAL ORGANIC CHEMISTRY

231670 The order of decreasing stability of the carbanions
$\left(\mathrm{CH}_{3}\right)_{3} \mathrm{C}^{-}(\mathrm{I}), \quad\left(\mathrm{CH}_{3}\right)_{2} \mathrm{CH}^{-}(\mathrm{II}), \quad \mathrm{CH}_{3} \mathrm{CH}_{2}^{-} \text {(III), }$
$\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{CH}_{2}^{-} \text {(IV) is }$

1 I $>$ II $>$ III $>$ IV
2 IV $>$ III $>$ II $>$ I
3 IV $>$ I $>$ II $>$ III
4 I $>$ II $>$ IV $>$ III
Assam CEE-2020
GENERAL ORGANIC CHEMISTRY

231673 The resonance energy of benzene in $\mathrm{kcal} / \mathrm{mol}$ is about

1 $\approx 20$
2 $\approx 40$
3 $\approx 60$
4 $\approx 80$
BCECE-2009
GENERAL ORGANIC CHEMISTRY

231674 Which one of the following carbocation is most stable?

1 $\left(\mathrm{CH}_{3}\right)_{3} \mathrm{C}^{+} \mathrm{H}_{2}$
2 $\left(\mathrm{CH}_{3}\right)_{3} \stackrel{+}{\mathrm{C}}$
3 $\mathrm{CH}_{3} \mathrm{CH}_{2} \stackrel{+}{\mathrm{C}} \mathrm{H}_{2}$
4 $\mathrm{CH}_{3} \stackrel{+}{\mathrm{C}} \mathrm{HCH}_{2} \mathrm{CH}_{3}$
BCECE-2012
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GENERAL ORGANIC CHEMISTRY

231669 Which one of the following statements is not true about resonance?

1 The resonating structures are hypothetical
2 The unpaired electrons in various structures are same
3 Hybrid structure is least stable
4 Hybrid structure is least energetic
Assam CEE-2014
GENERAL ORGANIC CHEMISTRY

231670 The order of decreasing stability of the carbanions
$\left(\mathrm{CH}_{3}\right)_{3} \mathrm{C}^{-}(\mathrm{I}), \quad\left(\mathrm{CH}_{3}\right)_{2} \mathrm{CH}^{-}(\mathrm{II}), \quad \mathrm{CH}_{3} \mathrm{CH}_{2}^{-} \text {(III), }$
$\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{CH}_{2}^{-} \text {(IV) is }$

1 I $>$ II $>$ III $>$ IV
2 IV $>$ III $>$ II $>$ I
3 IV $>$ I $>$ II $>$ III
4 I $>$ II $>$ IV $>$ III
Assam CEE-2020
GENERAL ORGANIC CHEMISTRY

231673 The resonance energy of benzene in $\mathrm{kcal} / \mathrm{mol}$ is about

1 $\approx 20$
2 $\approx 40$
3 $\approx 60$
4 $\approx 80$
BCECE-2009
GENERAL ORGANIC CHEMISTRY

231674 Which one of the following carbocation is most stable?

1 $\left(\mathrm{CH}_{3}\right)_{3} \mathrm{C}^{+} \mathrm{H}_{2}$
2 $\left(\mathrm{CH}_{3}\right)_{3} \stackrel{+}{\mathrm{C}}$
3 $\mathrm{CH}_{3} \mathrm{CH}_{2} \stackrel{+}{\mathrm{C}} \mathrm{H}_{2}$
4 $\mathrm{CH}_{3} \stackrel{+}{\mathrm{C}} \mathrm{HCH}_{2} \mathrm{CH}_{3}$
BCECE-2012
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GENERAL ORGANIC CHEMISTRY

231669 Which one of the following statements is not true about resonance?

1 The resonating structures are hypothetical
2 The unpaired electrons in various structures are same
3 Hybrid structure is least stable
4 Hybrid structure is least energetic
Assam CEE-2014
GENERAL ORGANIC CHEMISTRY

231670 The order of decreasing stability of the carbanions
$\left(\mathrm{CH}_{3}\right)_{3} \mathrm{C}^{-}(\mathrm{I}), \quad\left(\mathrm{CH}_{3}\right)_{2} \mathrm{CH}^{-}(\mathrm{II}), \quad \mathrm{CH}_{3} \mathrm{CH}_{2}^{-} \text {(III), }$
$\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{CH}_{2}^{-} \text {(IV) is }$

1 I $>$ II $>$ III $>$ IV
2 IV $>$ III $>$ II $>$ I
3 IV $>$ I $>$ II $>$ III
4 I $>$ II $>$ IV $>$ III
Assam CEE-2020
GENERAL ORGANIC CHEMISTRY

231673 The resonance energy of benzene in $\mathrm{kcal} / \mathrm{mol}$ is about

1 $\approx 20$
2 $\approx 40$
3 $\approx 60$
4 $\approx 80$
BCECE-2009
GENERAL ORGANIC CHEMISTRY

231674 Which one of the following carbocation is most stable?

1 $\left(\mathrm{CH}_{3}\right)_{3} \mathrm{C}^{+} \mathrm{H}_{2}$
2 $\left(\mathrm{CH}_{3}\right)_{3} \stackrel{+}{\mathrm{C}}$
3 $\mathrm{CH}_{3} \mathrm{CH}_{2} \stackrel{+}{\mathrm{C}} \mathrm{H}_{2}$
4 $\mathrm{CH}_{3} \stackrel{+}{\mathrm{C}} \mathrm{HCH}_{2} \mathrm{CH}_{3}$
BCECE-2012
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GENERAL ORGANIC CHEMISTRY

231669 Which one of the following statements is not true about resonance?

1 The resonating structures are hypothetical
2 The unpaired electrons in various structures are same
3 Hybrid structure is least stable
4 Hybrid structure is least energetic
Assam CEE-2014
GENERAL ORGANIC CHEMISTRY

231670 The order of decreasing stability of the carbanions
$\left(\mathrm{CH}_{3}\right)_{3} \mathrm{C}^{-}(\mathrm{I}), \quad\left(\mathrm{CH}_{3}\right)_{2} \mathrm{CH}^{-}(\mathrm{II}), \quad \mathrm{CH}_{3} \mathrm{CH}_{2}^{-} \text {(III), }$
$\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{CH}_{2}^{-} \text {(IV) is }$

1 I $>$ II $>$ III $>$ IV
2 IV $>$ III $>$ II $>$ I
3 IV $>$ I $>$ II $>$ III
4 I $>$ II $>$ IV $>$ III
Assam CEE-2020
GENERAL ORGANIC CHEMISTRY

231673 The resonance energy of benzene in $\mathrm{kcal} / \mathrm{mol}$ is about

1 $\approx 20$
2 $\approx 40$
3 $\approx 60$
4 $\approx 80$
BCECE-2009
GENERAL ORGANIC CHEMISTRY

231674 Which one of the following carbocation is most stable?

1 $\left(\mathrm{CH}_{3}\right)_{3} \mathrm{C}^{+} \mathrm{H}_{2}$
2 $\left(\mathrm{CH}_{3}\right)_{3} \stackrel{+}{\mathrm{C}}$
3 $\mathrm{CH}_{3} \mathrm{CH}_{2} \stackrel{+}{\mathrm{C}} \mathrm{H}_{2}$
4 $\mathrm{CH}_{3} \stackrel{+}{\mathrm{C}} \mathrm{HCH}_{2} \mathrm{CH}_{3}$
BCECE-2012
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