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Standard XII

Chemistry

+I Effect

Which of the ...

Question

Which of the following will show a ‘+M’ effect (positive mesomeric effect)
(i) $C H_{3}$ (ii) $- C l$ (iii) $- N H_{2}$ (iv) $- O H$
(v) $- O C H_{3}$ (vi) $- C = O$ (vii) $- C N$

i, ii, iii

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ii, iii, iv, v, vi

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ii, iii, iv, v

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ii, iii, iv

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Solution

The correct option is C ii, iii, iv, v
A directly attached atom having a lone pair will show + M effect.

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Similar questions

Q. Which of the following will show a ‘+M’ effect (positive mesomeric effect)
(i)

C H_{3}

(ii)

- C l

(iii)

- N H_{2}

(iv)

- O H

(v)

- O C H_{3}

(vi)

- C = O

(vii)

- C N

Q. Arrange the following compounds in decreasing order of reactivity towards nucleophilic addition reaction.

C H_{3} - O | | C I - C H_{3}

C H_{3} - O | | C I I - C l

C H_{3} - O | | C I I I - N H_{2}

C H_{3} - O | | C I V - O H

C H_{3} - O | | C - O V - O | | C - C H_{3}

Q. Which will not respond positively with fehling solution?

i . H_{2} C O, i i . C_{6} H_{5} C H O i i i . C H_{3} - C | O H H - O | | C - C H_{3}, i v . H - O | | C - N H_{2}

Which of the following are examples of combination reaction?

(i) $C a O + O_{2} \to 2 C a C O_{3}$

(ii) $C a C O_{3} \to C a O + C O_{2}$

(iii) $M g O + C O_{2} \to M g C O_{3}$

(iv) $F e + S \to F e S$

(v) $2 A g C l + s u n l i g h t \to 2 A g + C l_{2}$

(vi) $C H_{4} + 2 O_{2} \to C O_{2} + 2 H_{2} O$

(vii) $N a_{2} O + H_{2} O \to 2 N a O H$

Which of the following are examples of combination reactions?

(i) $C a O + O_{2} \to 2 C a C O_{3}$

(ii) $C a C O_{3} \to C a O + C O_{2}$

(iii) $M g O + C O_{2} \to M g C O_{3}$

(iv) $F e + S \to F e S$

(v) $2 A g C l + s u n l i g h t \to 2 A g + C l_{2}$

(vi) $C H_{4} + 2 O_{2} \to C O_{2} + 2 H_{2} O$

(vii) $N a_{2} O + H_{2} O \to 2 N a O H$

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Which of the following will show a ‘+M’ effect (positive mesomeric effect) (i) CH3 (ii) −Cl (iii) −NH2 (iv) −OH (v) −OCH3 (vi) −C=O (vii) −CN

The correct option is C ii, iii, iv, vA directly attached atom having a lone pair will show + M effect.

Which of the following will show a ‘+M’ effect (positive mesomeric effect)
(i) $C H_{3}$ (ii) $- C l$ (iii) $- N H_{2}$ (iv) $- O H$
(v) $- O C H_{3}$ (vi) $- C = O$ (vii) $- C N$

The correct option is C ii, iii, iv, v
A directly attached atom having a lone pair will show + M effect.