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Resonance Effect

Arrange the f...

Question

Arrange the following in increasing order of stability on the basis of resonance.
(i) $C H_{2} = C H - C H = C H - + C H_{2}$
(ii) $C H_{2} = C H - + C H - C H = C H_{2}$
(iii) $C H_{2} = C H - + C H - - C H - + C H_{2}$
(iv) $+ C H_{2} - C H = C H - - C H - + C H_{2}$ .

(ii)

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(i)

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(iii)

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(iv)

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(iii)

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(ii)

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(i)

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(iv)

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(i)

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(iii)

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(ii)

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(iv)

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(iv)

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(ii)

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(iii)

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(i)

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Solution

The correct option is B (ii) $>$ (i) $>$ (iii) $>$ (iv)
(a) $(i i) > (i) > (i i i) > (i v)$
(i) and (iii) should have greater stability as compared to (iii) and (iv) because of greater number of covalent bonds. Also (ii) has got $2^{o}$ carbocation whereas (i) has $1^{o}$ carbocation (iii) has unlike charges close to each other but (iv) has no such factor.

Suggest Corrections

Similar questions

Q. The length of the carbon-carbon single bond of the compounds

C H_{2} = C H - C \equiv C H

II)

C H \equiv C - C \equiv C H

III)

C H_{3} - C H = C H_{2}

IV)

C H_{2} = C H - C H = C H_{2}

is expected to decrease in the order :

$C H_{3} O - C H = C H - N O_{2}$	$I$
$C H_{2} = C H - N O_{2}$	$I I$
$C H_{2} = C H - C l$	$I I I$
$C H_{2} = C H_{2}$	$I V$

Which of the following is the correct order of

C = C

bond lengths among these compounds?

Q. I.

C H_{2} = C H - C H = C H - \oplus N H_{3}

II.

\oplus C H_{2} - C H = C H - ⊖ C H - \oplus N H_{3}

III.

\oplus C H_{2} - C H = C H - C H = N H_{3}

Which of these structures is not a valid canonical structure?

Arrange the following compounds in decreasing order of reactivity with Br2

CH2=CH2 (I), CH ≡ CH (II), CH2=CHCl (III)

Arrange the following compounds in decreasing order of reactivity with $B r_{2}$

$C H_{2} = C H_{2} (I), C H \equiv C H (I I), C H_{2} = C H C l (I I I)$

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Arrange the following in increasing order of stability on the basis of resonance.(i) CH2=CH−CH=CH−+CH2(ii) CH2=CH−+CH−CH=CH2(iii) CH2=CH−+CH−−CH−+CH2(iv) +CH2−CH=CH−−CH−+CH2.

Arrange the following in increasing order of stability on the basis of resonance.
(i) $C H_{2} = C H - C H = C H - + C H_{2}$
(ii) $C H_{2} = C H - + C H - C H = C H_{2}$
(iii) $C H_{2} = C H - + C H - - C H - + C H_{2}$
(iv) $+ C H_{2} - C H = C H - - C H - + C H_{2}$ .