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Addition Reactions

Discuss the m...

Question

Discuss the mechanism of reaction aqueous solution of chlorine with $t r a n s - 2 -$ butene.

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Solution

The pi electrons of the double bond of trans-2-butene are donated to $C l^{+}$ to form cyclic chloronium ion. This is followed by nucleophilic attack of water molecule and deprotonation to form the product chlorohydrin which is a racemic mixture.

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Similar questions

Q. Consider the reaction of trans-

2

B r_{2}

C H_{2} C l_{2}

. Which statement concerning this reaction is correct?

Q. Select the true / false statements.

S_{1}

: The rate of catalytic hydrogenation of 2-butyne is greater than trans 2-butene.

S_{2}

: The rate of reduction of

C H_{2} = O

(C H_{3})_{2} C = O

L i A l H_{4}

.

S_{3}

: The aqueous solution of

C H_{3} M g B r

S_{N} 2

reaction with primary alkyl halides.

Q. Photochemical reaction of trans-2-butene with itself will produce which of the following products?

Q. A mixture of two alcohols

3 -

- 1 -

2 -

- 1 -

butanol, given chiefly

2 -

- 2 -

butene when dehydrated with acid.

2 -

- 2 -

butene is converted into

2 -

- 2 -

butanol with approximately 90% yield by treatment with 50% aqueous solution of sulphuric acid at

0^{\circ}

C. Write equation showing mechanism of conversions.

C i s

-2-butene gives

m e s o

-2,3-butanediol with dilute alkaline

K M n O_{4}

solution. Reason: Dilute alkaline

K M n O_{4}

solution given trans addition with alkenes.

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