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Standard XII

Chemistry

Isomerism

When 2-buty...

Question

When $2 - b u t y n e$ is treated with $P d - B a S O_{4} / H_{2}$ ; the product formed will be:

1 - b u t e n e

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t r a n s - 2 - b u t e n e

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c i s - 2 - b u t e n e

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2 - h y d r o x y b u t a n e

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Solution

The correct option is C $c i s - 2 - b u t e n e$

When $2 - b u t y n e$ is treated with $H_{2} / P d - B a S O_{4}$ ; the product formed will be $c i s - 2 - b u t e n e$ . A molecule of hydrogen is added to $C \equiv C$ triple bond to form $C = C$ double bond. This gives only cis alkene.

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Similar questions

Q. If a mixture containing

1 - b u t e n e

c i s - 2 - b u t e n e

and

t r a n s - 2 - b u t e n e

is treated with peracid, how many different isomers of epoxides result?

Q. (i) Cis - 2 - butene

\to

trans-2-butene,

△ H_{1}

(ii) Cis - 2 - butene

\to

1 - butene,

△ 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

△ H_{2}

in kcal/mol are

Q. (i) Cis - 2 - butene

\to

trans-2-butene,

△ H_{1}

(ii) Cis - 2 - butene

\to

1 - butene,

△ 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

△ H_{2}

in kcal/mol are

There are some alkenes are given as follow:

2-methyl propene, cis-2-butene, trans-2-butene

Which of the following is the correct order for increasing order of reactivity for acid catalyzed hydration?

1) trans-2-butene< cis-2-butene < 2-methyl propene

2) cis-2-butene< trans-2-butene < 2-methyl propene

3) 2-methyl propene < trans-2-butene < cis-2-butene

Q. (i) Cis-2-butene

\to

trans-2-butene,

Δ H_{1}

(ii) Cis-2-butene

\to

1-butene,

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}

Δ H_{2}

respectively in K Cal/mole are

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When 2−butyne is treated with Pd−BaSO4/H2; the product formed will be:

The correct option is C cis−2−buteneWhen 2−butyne is treated with H2/Pd−BaSO4; the product formed will be cis−2−butene. A molecule of hydrogen is added to C≡C triple bond to form C=C double bond. This gives only cis alkene.

When $2 - b u t y n e$ is treated with $P d - B a S O_{4} / H_{2}$ ; the product formed will be:

The correct option is C $c i s - 2 - b u t e n e$

When $2 - b u t y n e$ is treated with $H_{2} / P d - B a S O_{4}$ ; the product formed will be $c i s - 2 - b u t e n e$ . A molecule of hydrogen is added to $C \equiv C$ triple bond to form $C = C$ double bond. This gives only cis alkene.