8.1. Aldehydes and ketones — Chemistry STD 12 Science — Question

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 ?

Assertion $(A) :$ Sucrose is a disaccharide and a non-reducing sugar.

Reason $(R) :$ Sucrose involves glycosidic linkage between $C_{1}$ of $\beta$-glucose and $C_{2}$ of $\alpha$-fructose.

Choose the most appropriate answer from the options given below :

$(A)$ The stronger the temperature dependence of the rate constant, the higher is the activation energy.

$(B)$ If a reaction has zero activation energy, its rate is independent of temperature.

$(C)$ The stronger the temperature dependence of the rate constant, the smaller is the activation energy.

$(D)$ If there is no correlation between the temperature and the rate constant then it means that the reaction has negative activation energy.

$'X'\,\,\xrightarrow{{water}}$  Insoluble

$'X'\xrightarrow{{5\% \,HCl}}$  Insoluble

$'X'\xrightarrow{{10\% \,NaOH}}$  Insoluble

$'X'\xrightarrow{{10\% \,NaHC{O_3}}}$  Insoluble