The pair of molecules that are metamers among the following is :
$\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{CH}_2 \mathrm{OH}$ and $\mathrm{CH}_3-\mathrm{CH}(\mathrm{OH})-\mathrm{CH}_3$
$\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{CH}_2 \mathrm{CH}_2 \mathrm{CH}_3$ and $\left(\mathrm{CH}_3\right)_2 \mathrm{CHCH}_2 \mathrm{CH}_3$
$$ \mathrm{CH}_3 \mathrm{OCH}_2 \mathrm{CH}_2 \mathrm{CH}_3 \text { and } \mathrm{CH}_3 \mathrm{CH}_2 \mathrm{OCH}_2 \mathrm{CH}_3 $$
$$ \text { In the following reaction sequence, } \mathrm{X} \text { and } \mathrm{Z} \text { respectively are : } $$
$$ \mathrm{X}=\mathrm{POCl}_3 ; \mathrm{Z}=\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{CH}_2-\mathrm{Br} $$
$$ \mathrm{X}=\mathrm{H}_3 \mathrm{PO}_3 ; \mathrm{Z}=\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{CH}_2-\mathrm{Br} $$
The functional group that can be identified through phthalein dye test is :
The major product D formed in the following reaction sequence is :
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