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  4. A 1.84 mg sample of polyhydric alcoholic compound ' X ' of molar mass 92.0 g / mol gave 1.344 mL of H 2 gas at STP. The number of alcoholic hydrogens present in compound ' X ' is

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Q. A $1.84\, mg$ sample of polyhydric alcoholic compound ' $X$ ' of molar mass $92.0 \,g / mol$ gave $1.344 \,mL$ of $H _2$ gas at STP. The number of alcoholic hydrogens present in compound ' $X$ ' is

JEE MainJEE Main 2022Some Basic Concepts of Chemistry

Solution:

$R ( OH )_{ x } \rightarrow H _2$
PoAC on $H -$
$ x\left(\frac{1.84 \times 10^{-3}}{92}\right)=\frac{1.344}{22.4} \times 2 $
$ x=\frac{1.344 \times 2 \times 92 \times 1000}{1.84 \times 22400}=6 $
$ x=6$