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  4. Which one of the following is a trihydric alcohol containing only secondary hydroxyl group?

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Q. Which one of the following is a trihydric alcohol containing only secondary hydroxyl group?

Jharkhand CECEJharkhand CECE 2003

Solution:

$1^{\circ}$ carbon atom has only alkyl group attached to it. $2^{\circ}$ carbon atom has $2$ alkyl group attached to it. $3^{\circ}$ carbon atom has $3$ alkyl group attached to it.
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$\therefore $ it has $1,2,3^{\circ}$ hydroxyl groups.
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$\therefore $ It has $1^{\circ}$ and $2^{\circ}$ hydroxyl gas.
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$\therefore $ it has all $2^{\circ}$ hydroxyl group.