01. Resonance
« Previous Topic: 00. Electronic effect and Its Applications Next Topic: 02. Nomenclature of Organic compound »
GENERAL ORGANIC CHEMISTRY

231648 Consider the following carbanions :
1.$\mathrm{CH}_{3}-\stackrel{\ominus}{\mathrm{C}} \mathrm{H}_{2}$
2.$\mathrm{CH}_{2}=\stackrel{\oplus}{\mathrm{C}} \mathbf{H}$
3.$\mathbf{C H} \equiv \stackrel{\oplus}{\mathbf{C}}$
4.$\mathrm{C}_{6} \mathbf{H}_{5}-\stackrel{\oplus}{\mathrm{C}} \mathrm{H}_{2}$
What is the correct order of stability of above carbanions ?

1 $1>2>3>4$
2 $4>3>1>2$
3 $4>3>2>1$
4 $1>2>4>3$
SCRA - 2009
GENERAL ORGANIC CHEMISTRY

231649 Which of the following statements is correct about $\mathrm{CO}_{3}^{2-}$ ?
A. The hybridisation of central atom is $\mathbf{s p}^{3}$.
B. Its resonance structure has one $\mathrm{C}-\mathrm{O}$ single bond and two $\mathrm{C}=\mathrm{O}$ double bonds.
C. The average formal charge on each oxygen atom is 0.67 units.
D. All $\mathrm{C}-\mathrm{O}$ bond lengths are equal.

1 $\mathrm{A}$
2 $\mathrm{B}$
3 $\mathrm{C}$
4 $\mathrm{D}$
AP EAMCET (Engg.) 21.09.2020
GENERAL ORGANIC CHEMISTRY

231653 Homolytic fission of the following alkanes form free radicals $\mathrm{CH}_{3} \mathrm{CH}_{3}, \quad \mathrm{CH}_{3} \mathrm{CH}_{2}-\mathrm{CH}_{3}$, $\left(\mathrm{CH}_{3}\right)_{2} \mathrm{CH}-\mathrm{CH}_{3}, \quad \mathrm{CH}_{3}-\mathrm{CH}_{2}-\mathrm{CH}\left(\mathrm{CH}_{3}\right)_{2}$. Increasing order of Stability of the radicals is

1 \(\begin{aligned} & \left(\mathrm{CH}_3\right)_2 \dot{\mathrm{C}}-\mathrm{CH}_2 \mathrm{CH}_3<\mathrm{CH}_3-\dot{\mathrm{C}} \mathrm{HCH}_3 \\ & <\mathrm{CH}_3-\dot{\mathrm{C}} \mathrm{H}_2<\left(\mathrm{CH}_3\right)_3 \dot{\mathrm{C}}\end{aligned}\)
2 \(\begin{aligned} & \mathrm{CH}_3-\dot{\mathrm{C}} \mathrm{H}_2<\mathrm{CH}_3-\dot{\mathrm{C}} \mathrm{H}-\mathrm{CH}_3< \\ & \quad\left(\mathrm{CH}_3\right)_2 \dot{\mathrm{C}}-\mathrm{CH}_2-\mathrm{CH}_3<\left(\mathrm{CH}_3\right)_3 \dot{\mathrm{C}}\end{aligned}\)
3 \(\begin{aligned} & \mathrm{CH}_3-\dot{\mathrm{C}} \mathrm{H}_2<\mathrm{CH}_3-\dot{\mathrm{C}} \mathrm{H}-\mathrm{CH}_3< \\ & \quad\left(\mathrm{CH}_3\right)_3 \dot{\mathrm{C}}<\left(\mathrm{CH}_3\right)_2 \dot{\mathrm{C}}-\mathrm{CH}_2 \mathrm{CH}_3\end{aligned}\)
4 \(\begin{gathered}\left(\mathrm{CH}_3\right)_3 \dot{\mathrm{C}}<\left(\mathrm{CH}_3\right)_2 \dot{\mathrm{C}} \mathrm{CH}_2 \mathrm{CH}_3<\mathrm{CH}_3 \dot{\mathrm{C}} \mathrm{H}- \\ \mathrm{CH}_3<\mathrm{CH}_3-\dot{\mathrm{C}} \mathrm{H}_2\end{gathered}\)
Karnataka NEET 2013
GENERAL ORGANIC CHEMISTRY

231654 Among the following, the one which undergo acid catalyzed dehydration relatively easily, is

1 original image
2 original image
3 original image
4 original image
TS- EAMCET 09.08.2021
For More Updates join with Us
NEET Test Series from KOTA - 10 Papers In MS WORD WhatsApp Here
GENERAL ORGANIC CHEMISTRY

231648 Consider the following carbanions :
1.$\mathrm{CH}_{3}-\stackrel{\ominus}{\mathrm{C}} \mathrm{H}_{2}$
2.$\mathrm{CH}_{2}=\stackrel{\oplus}{\mathrm{C}} \mathbf{H}$
3.$\mathbf{C H} \equiv \stackrel{\oplus}{\mathbf{C}}$
4.$\mathrm{C}_{6} \mathbf{H}_{5}-\stackrel{\oplus}{\mathrm{C}} \mathrm{H}_{2}$
What is the correct order of stability of above carbanions ?

1 $1>2>3>4$
2 $4>3>1>2$
3 $4>3>2>1$
4 $1>2>4>3$
SCRA - 2009
GENERAL ORGANIC CHEMISTRY

231649 Which of the following statements is correct about $\mathrm{CO}_{3}^{2-}$ ?
A. The hybridisation of central atom is $\mathbf{s p}^{3}$.
B. Its resonance structure has one $\mathrm{C}-\mathrm{O}$ single bond and two $\mathrm{C}=\mathrm{O}$ double bonds.
C. The average formal charge on each oxygen atom is 0.67 units.
D. All $\mathrm{C}-\mathrm{O}$ bond lengths are equal.

1 $\mathrm{A}$
2 $\mathrm{B}$
3 $\mathrm{C}$
4 $\mathrm{D}$
AP EAMCET (Engg.) 21.09.2020
GENERAL ORGANIC CHEMISTRY

231653 Homolytic fission of the following alkanes form free radicals $\mathrm{CH}_{3} \mathrm{CH}_{3}, \quad \mathrm{CH}_{3} \mathrm{CH}_{2}-\mathrm{CH}_{3}$, $\left(\mathrm{CH}_{3}\right)_{2} \mathrm{CH}-\mathrm{CH}_{3}, \quad \mathrm{CH}_{3}-\mathrm{CH}_{2}-\mathrm{CH}\left(\mathrm{CH}_{3}\right)_{2}$. Increasing order of Stability of the radicals is

1 \(\begin{aligned} & \left(\mathrm{CH}_3\right)_2 \dot{\mathrm{C}}-\mathrm{CH}_2 \mathrm{CH}_3<\mathrm{CH}_3-\dot{\mathrm{C}} \mathrm{HCH}_3 \\ & <\mathrm{CH}_3-\dot{\mathrm{C}} \mathrm{H}_2<\left(\mathrm{CH}_3\right)_3 \dot{\mathrm{C}}\end{aligned}\)
2 \(\begin{aligned} & \mathrm{CH}_3-\dot{\mathrm{C}} \mathrm{H}_2<\mathrm{CH}_3-\dot{\mathrm{C}} \mathrm{H}-\mathrm{CH}_3< \\ & \quad\left(\mathrm{CH}_3\right)_2 \dot{\mathrm{C}}-\mathrm{CH}_2-\mathrm{CH}_3<\left(\mathrm{CH}_3\right)_3 \dot{\mathrm{C}}\end{aligned}\)
3 \(\begin{aligned} & \mathrm{CH}_3-\dot{\mathrm{C}} \mathrm{H}_2<\mathrm{CH}_3-\dot{\mathrm{C}} \mathrm{H}-\mathrm{CH}_3< \\ & \quad\left(\mathrm{CH}_3\right)_3 \dot{\mathrm{C}}<\left(\mathrm{CH}_3\right)_2 \dot{\mathrm{C}}-\mathrm{CH}_2 \mathrm{CH}_3\end{aligned}\)
4 \(\begin{gathered}\left(\mathrm{CH}_3\right)_3 \dot{\mathrm{C}}<\left(\mathrm{CH}_3\right)_2 \dot{\mathrm{C}} \mathrm{CH}_2 \mathrm{CH}_3<\mathrm{CH}_3 \dot{\mathrm{C}} \mathrm{H}- \\ \mathrm{CH}_3<\mathrm{CH}_3-\dot{\mathrm{C}} \mathrm{H}_2\end{gathered}\)
Karnataka NEET 2013
GENERAL ORGANIC CHEMISTRY

231654 Among the following, the one which undergo acid catalyzed dehydration relatively easily, is

1 original image
2 original image
3 original image
4 original image
TS- EAMCET 09.08.2021
NEET DIGITAL LIBRARY
GENERAL ORGANIC CHEMISTRY

231648 Consider the following carbanions :
1.$\mathrm{CH}_{3}-\stackrel{\ominus}{\mathrm{C}} \mathrm{H}_{2}$
2.$\mathrm{CH}_{2}=\stackrel{\oplus}{\mathrm{C}} \mathbf{H}$
3.$\mathbf{C H} \equiv \stackrel{\oplus}{\mathbf{C}}$
4.$\mathrm{C}_{6} \mathbf{H}_{5}-\stackrel{\oplus}{\mathrm{C}} \mathrm{H}_{2}$
What is the correct order of stability of above carbanions ?

1 $1>2>3>4$
2 $4>3>1>2$
3 $4>3>2>1$
4 $1>2>4>3$
SCRA - 2009
GENERAL ORGANIC CHEMISTRY

231649 Which of the following statements is correct about $\mathrm{CO}_{3}^{2-}$ ?
A. The hybridisation of central atom is $\mathbf{s p}^{3}$.
B. Its resonance structure has one $\mathrm{C}-\mathrm{O}$ single bond and two $\mathrm{C}=\mathrm{O}$ double bonds.
C. The average formal charge on each oxygen atom is 0.67 units.
D. All $\mathrm{C}-\mathrm{O}$ bond lengths are equal.

1 $\mathrm{A}$
2 $\mathrm{B}$
3 $\mathrm{C}$
4 $\mathrm{D}$
AP EAMCET (Engg.) 21.09.2020
GENERAL ORGANIC CHEMISTRY

231653 Homolytic fission of the following alkanes form free radicals $\mathrm{CH}_{3} \mathrm{CH}_{3}, \quad \mathrm{CH}_{3} \mathrm{CH}_{2}-\mathrm{CH}_{3}$, $\left(\mathrm{CH}_{3}\right)_{2} \mathrm{CH}-\mathrm{CH}_{3}, \quad \mathrm{CH}_{3}-\mathrm{CH}_{2}-\mathrm{CH}\left(\mathrm{CH}_{3}\right)_{2}$. Increasing order of Stability of the radicals is

1 \(\begin{aligned} & \left(\mathrm{CH}_3\right)_2 \dot{\mathrm{C}}-\mathrm{CH}_2 \mathrm{CH}_3<\mathrm{CH}_3-\dot{\mathrm{C}} \mathrm{HCH}_3 \\ & <\mathrm{CH}_3-\dot{\mathrm{C}} \mathrm{H}_2<\left(\mathrm{CH}_3\right)_3 \dot{\mathrm{C}}\end{aligned}\)
2 \(\begin{aligned} & \mathrm{CH}_3-\dot{\mathrm{C}} \mathrm{H}_2<\mathrm{CH}_3-\dot{\mathrm{C}} \mathrm{H}-\mathrm{CH}_3< \\ & \quad\left(\mathrm{CH}_3\right)_2 \dot{\mathrm{C}}-\mathrm{CH}_2-\mathrm{CH}_3<\left(\mathrm{CH}_3\right)_3 \dot{\mathrm{C}}\end{aligned}\)
3 \(\begin{aligned} & \mathrm{CH}_3-\dot{\mathrm{C}} \mathrm{H}_2<\mathrm{CH}_3-\dot{\mathrm{C}} \mathrm{H}-\mathrm{CH}_3< \\ & \quad\left(\mathrm{CH}_3\right)_3 \dot{\mathrm{C}}<\left(\mathrm{CH}_3\right)_2 \dot{\mathrm{C}}-\mathrm{CH}_2 \mathrm{CH}_3\end{aligned}\)
4 \(\begin{gathered}\left(\mathrm{CH}_3\right)_3 \dot{\mathrm{C}}<\left(\mathrm{CH}_3\right)_2 \dot{\mathrm{C}} \mathrm{CH}_2 \mathrm{CH}_3<\mathrm{CH}_3 \dot{\mathrm{C}} \mathrm{H}- \\ \mathrm{CH}_3<\mathrm{CH}_3-\dot{\mathrm{C}} \mathrm{H}_2\end{gathered}\)
Karnataka NEET 2013
GENERAL ORGANIC CHEMISTRY

231654 Among the following, the one which undergo acid catalyzed dehydration relatively easily, is

1 original image
2 original image
3 original image
4 original image
TS- EAMCET 09.08.2021
Join With Us for More Updates
GENERAL ORGANIC CHEMISTRY

231648 Consider the following carbanions :
1.$\mathrm{CH}_{3}-\stackrel{\ominus}{\mathrm{C}} \mathrm{H}_{2}$
2.$\mathrm{CH}_{2}=\stackrel{\oplus}{\mathrm{C}} \mathbf{H}$
3.$\mathbf{C H} \equiv \stackrel{\oplus}{\mathbf{C}}$
4.$\mathrm{C}_{6} \mathbf{H}_{5}-\stackrel{\oplus}{\mathrm{C}} \mathrm{H}_{2}$
What is the correct order of stability of above carbanions ?

1 $1>2>3>4$
2 $4>3>1>2$
3 $4>3>2>1$
4 $1>2>4>3$
SCRA - 2009
GENERAL ORGANIC CHEMISTRY

231649 Which of the following statements is correct about $\mathrm{CO}_{3}^{2-}$ ?
A. The hybridisation of central atom is $\mathbf{s p}^{3}$.
B. Its resonance structure has one $\mathrm{C}-\mathrm{O}$ single bond and two $\mathrm{C}=\mathrm{O}$ double bonds.
C. The average formal charge on each oxygen atom is 0.67 units.
D. All $\mathrm{C}-\mathrm{O}$ bond lengths are equal.

1 $\mathrm{A}$
2 $\mathrm{B}$
3 $\mathrm{C}$
4 $\mathrm{D}$
AP EAMCET (Engg.) 21.09.2020
GENERAL ORGANIC CHEMISTRY

231653 Homolytic fission of the following alkanes form free radicals $\mathrm{CH}_{3} \mathrm{CH}_{3}, \quad \mathrm{CH}_{3} \mathrm{CH}_{2}-\mathrm{CH}_{3}$, $\left(\mathrm{CH}_{3}\right)_{2} \mathrm{CH}-\mathrm{CH}_{3}, \quad \mathrm{CH}_{3}-\mathrm{CH}_{2}-\mathrm{CH}\left(\mathrm{CH}_{3}\right)_{2}$. Increasing order of Stability of the radicals is

1 \(\begin{aligned} & \left(\mathrm{CH}_3\right)_2 \dot{\mathrm{C}}-\mathrm{CH}_2 \mathrm{CH}_3<\mathrm{CH}_3-\dot{\mathrm{C}} \mathrm{HCH}_3 \\ & <\mathrm{CH}_3-\dot{\mathrm{C}} \mathrm{H}_2<\left(\mathrm{CH}_3\right)_3 \dot{\mathrm{C}}\end{aligned}\)
2 \(\begin{aligned} & \mathrm{CH}_3-\dot{\mathrm{C}} \mathrm{H}_2<\mathrm{CH}_3-\dot{\mathrm{C}} \mathrm{H}-\mathrm{CH}_3< \\ & \quad\left(\mathrm{CH}_3\right)_2 \dot{\mathrm{C}}-\mathrm{CH}_2-\mathrm{CH}_3<\left(\mathrm{CH}_3\right)_3 \dot{\mathrm{C}}\end{aligned}\)
3 \(\begin{aligned} & \mathrm{CH}_3-\dot{\mathrm{C}} \mathrm{H}_2<\mathrm{CH}_3-\dot{\mathrm{C}} \mathrm{H}-\mathrm{CH}_3< \\ & \quad\left(\mathrm{CH}_3\right)_3 \dot{\mathrm{C}}<\left(\mathrm{CH}_3\right)_2 \dot{\mathrm{C}}-\mathrm{CH}_2 \mathrm{CH}_3\end{aligned}\)
4 \(\begin{gathered}\left(\mathrm{CH}_3\right)_3 \dot{\mathrm{C}}<\left(\mathrm{CH}_3\right)_2 \dot{\mathrm{C}} \mathrm{CH}_2 \mathrm{CH}_3<\mathrm{CH}_3 \dot{\mathrm{C}} \mathrm{H}- \\ \mathrm{CH}_3<\mathrm{CH}_3-\dot{\mathrm{C}} \mathrm{H}_2\end{gathered}\)
Karnataka NEET 2013
GENERAL ORGANIC CHEMISTRY

231654 Among the following, the one which undergo acid catalyzed dehydration relatively easily, is

1 original image
2 original image
3 original image
4 original image
TS- EAMCET 09.08.2021
For More Updates join with Us
NEET Test Series from KOTA - 10 Papers In MS WORD WhatsApp Here