MCQ
$(CH_3)_2CHBr$ $\xrightarrow[{(2)\,CuI}]{{(1)\,Li}}\left( A \right)\xrightarrow{{{{\left( {C{H_3}} \right)}_2}CHC{H_2}Br}}B$
$'B'$ is
- A$(CH_3)_2CHCH_2CH_3$
- B$CH_3)_2CHCH(CH_3)_2$
- ✓$(CH_3)_2CHCH_2CH(CH_3)_2$
- D$(CH_3)_2CHCH_2CH_2CH(CH_3)_2$
$'B'$ is

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[Atomic mass : Silver $=108$, Bromine $=80]$

$(a)$ The vapour pressure of water at $280 K$ is $14.2$ $mm Hg$
$(b)$ $R =0.082 L$ atm $K ^{-1} mol ^{-1}$