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Standard XII

Chemistry

Reduction to Amines

Why ZnCl2 is ...

Question

Why ZnCl2 is used with HCl to yield R-cl from R-oh but not Znbr2 with hbr to yield R-br from R-oh?

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It is given that when (±)-2,3-dibromobutane reacts with $K O H$ , some of the products formed are:

Explain via mechanism and then choose the correct ones from the following.

Monosubstitution of (2S,3S)-2,3-dibromobutane using $O H^{-}$ yields a mixture of products.
Monosubstitution of (2S,3S)-2,3-dibromobutane using $O H^{-}$ yields a single major product.
Monosubstitution of (2R,3R)-2,3-dibromobutane using $O H^{-}$ yields a mixture of products.
Monosubstitution of (2S,3S)-2,3-dibromobutane using $O H^{-}$ yields a mixture of products.

Q. When treated with

c o n c . H C l, M n O_{2}

yields a gas

(X)

which further reacts with

C a (O H)_{2}

to generate a white solid

(Y)

. The solid

Y

reacts with

d i l . H C l

to produce the same gas

X

. The solid

Y

is :

C_{6} H_{6} C I_{6} C_{6} H_{6} C I_{6}

on treatment with alcoholic KOHKOH yields .

A :

C_{6} H_{6} C_{6} H_{6}

B :

C_{6} H_{3} C I_{3} C_{6} H_{3} C I_{3}

C : (

C_{6} H_{6}

)

O H

(

C_{6} H_{6}

)

O H

D :

C_{6} H_{6} C I_{4}

Q. Treatment of a

2^{o} O H

with

C r O_{3} / H_{2} S O_{4}

yields an/a :

Which of the following is not correct?

$O r d e r o f b a s i c i t y O r d e r o f n u c l e o p h i l i c i t y (a) F^{-} > C l^{-} > B r^{-} B r_{-} > C l^{-} > F^{-} (b) H - O - O^{-} > O H^{-} H - O - O^{-} > O H^{-} (c) C H_{3} > N H_{2}^{-} > O H - C H_{3} > N H_{2}^{-} > O H^{-} (d) H_{2} O > H_{2} S H_{2} O < H_{2} S$

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