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Formal Charge

CH3-CHCl-CH2-...

Question

$C H_{3} - C H C l - C H_{2} - C H_{3}$ ; $C H_{3} - C H = C H - C H_{3}$
$I$ $I I$
$C H_{3} - C = ¨ N - O H$ ; $C H_{3} - C H = ¨ N - O H$
$I I I$ $I V$
The number of stereogenic centres in these structures are, respectively:

A

1, 0, 2 and 2

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B

2, 2, 0 and 1

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C

1, 2, 0 and 2

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D

2, 0, 1 and 2

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Solution

The correct option is C 1, 2, 0 and 2
(I) $C H_{3} - H | C | C l - C H_{2} - C H_{3}$ stereo centre $= 1$

(II) $C H_{3} - C H = C H - C H_{3}$ stereo centre $= 2$

(III) $C H - C | = C H_{3} N - O H$ stereo centre $= 0$ (since 2 save group on $- c$ )

(IV) $C H_{3} - C H = N - O H$ stereo centre $= 2$

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