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Standard XII

Chemistry

Physical Properties of Alkenes

What is the o...

Question

What is the order of stability for
I. 1-butene; II cis-2-butene; III. trans-2-butene?

I < II < III

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I > II > III

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III > I > II

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I > II < III

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Solution

The correct option is A I < II < III
stability of alkene is judge by no. of $α -$ hydrogens.More the no. $α -$ hydrogen more the will be hyperconjuction more will be stability of alkene. cisalkene is less stable than trans alkene so order of stablity is
$(i) < (i i) < (i i i)$

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Similar questions

Q. (i) Cis-2-butene

\to

trans-2-butene,

Δ H_{1}

(ii) Cis-2-butene

\to

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Δ H_{2}

(iii) Trans-2-butene is more stable than cis-2-butene.
(iv) Enthalpy of combustion of 1- butene,

Δ H = - 647.0 k C a l / m o l .

The value of

Δ H_{1}

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Q. The decreasing order of reactivity of the following alkenes is:
(i) 2,3-Dimethyl-2-butene
(ii) 2-Methyl-2-butene
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Q. (i) Cis - 2 - butene

\to

trans-2-butene,

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(ii) Cis - 2 - butene

\to

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△ H_{2}

(iii) Trans-2-butene is more stable than cis - 2 - butene.
(iv) Enthalpy of combustion of 1 - butene,

△ H = - 649.8 k c a l / m o l

(v)

9 △ H_{1} + 5 △ H_{2} = 0

(vi) Enthalpy of combustion of trans 2 - butene,

△ H = - 647.0 k c a l / m o l .

The value of

△ H_{1}

and

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in kcal/mol are

Q. (i) Cis - 2 - butene

\to

trans-2-butene,

△ H_{1}

(ii) Cis - 2 - butene

\to

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(iii) Trans-2-butene is more stable than cis - 2 - butene.
(iv) Enthalpy of combustion of 1 - butene,

△ H = - 649.8 k c a l / m o l

(v)

9 △ H_{1} + 5 △ H_{2} = 0

(vi) Enthalpy of combustion of trans 2 - butene,

△ H = - 647.0 k c a l / m o l .

The value of

△ H_{1}

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Q. Identify the correct increasing order of the stability of the following alkenes,

I . c i s

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I I . t r a n s

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I I I

. isobutene:

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What is the order of stability forI. 1-butene; II cis-2-butene; III. trans-2-butene?

The correct option is A I < II < IIIstability of alkene is judge by no. of α−hydrogens.More the no. α−hydrogen more the will be hyperconjuction more will be stability of alkene. cisalkene is less stable than trans alkene so order of stablity is (i)<(ii)<(iii)

What is the order of stability for
I. 1-butene; II cis-2-butene; III. trans-2-butene?

The correct option is A I < II < III
stability of alkene is judge by no. of $α -$ hydrogens.More the no. $α -$ hydrogen more the will be hyperconjuction more will be stability of alkene. cisalkene is less stable than trans alkene so order of stablity is
$(i) < (i i) < (i i i)$