Which of the following can be used for protection of carbonyl group :

C H_{2} O H - C H_{2} O H / H

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C H_{2} O H - C H_{2} - C H_{2} O H / H

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H S - (C H_{2})_{3} - S H

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C H_{2} O H - C H_{2} - C H O

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Solution

The correct options are
A $C H_{2} O H - C H_{2} O H / H$
B $C H_{2} O H - C H_{2} - C H_{2} O H / H$
C $H S - (C H_{2})_{3} - S H$
1,2 or 1,3 diols react with carbonyl group to form cyclic acetals. Hence, they can be used for protecting carbonyl group. Similarly 1,3-dithiol can be used for protecting carbonyl group.

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