The correct order of $C-X$ bond polarity is:

Predict the major product for the following $E2$ elimination reaction:

The reaction of $1$-chlorobutane with alcoholic $KOH$ yields .....

The rate of dehydrohalogenation of which one among the following is the least?

Which of the following pairs are correctly matched?
| | Reactants | Products |
|---|---|---|
| $I.$ | $RX + AgOH(aq)$ | $RH$ |
| $II.$ | $RX + AgCN(alc)$ | $RNC$ |
| $III.$ | $RX + KCN(alc)$ | $RNC$ |
| $IV.$ | $RX + Na(ether)$ | $R-R$ |

Arrange the following compounds in order of decreasing rate of hydrolysis for $SN_1$ reaction:
$(I)$ $C_6H_5CH_2Br$
$(II)$ $p-CH_3-C_6H_4-CH_2Br$
$(III)$ $p-(CH_3)_2CH-C_6H_4-CH_2Br$
$(IV)$ $p-CH_3CH_2-C_6H_4-CH_2Br$