MCQ
Isotonic solution have the same
- ADensity
- ✓Molar concentration
- CNormality
- DNone of these
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[${\underset{\raise0.3em\hbox{$\smash{\scriptscriptstyle-}$}}{O}} =$ mass $- 18$ isotope of oxygen]
Method $1\,:\,$ $RBr\xrightarrow[diethyl\,\,ether]{Mg}RMgBr\xrightarrow[2.\,{{H}_{3}}{{O}^{+}}]{1.\,C{{O}_{2}}}RC{{O}_{2}}H$
Method $2\,:\,$ $RBr\xrightarrow{NaCN}RCN\xrightarrow[heat]{{{H}_{2}}O,HCl}RC{{O}_{2}}H$
Which one of the following statements correctly describes this conversion ?
$I$. $-I$ Effect of nitro group.
$II$. Greater resonance effect of $p-$ nitrophenoxy group
$III$. Steric effect of bulky nitro group