The decreasing order of reactivity of the following organic molecules towards $AgNO_3$ solution is:

In the presence of light,chloroform is slowly oxidised by air to form:

The product of the reaction will be:

What type of hybridisation is present in the carbocation formed during the alkaline hydrolysis of $1-$bromo$-1-$phenylethane?

Given below are two statements :
Statement $I$ : $S_N2$ reactions are 'stereospecific',indicating that they result in the formation of only one stereo-isomer as the product.
Statement $II$ : $S_N1$ reactions generally result in the formation of product as racemic mixtures.
In the light of the above statements,choose the correct answer from the options given below :

The principal organic product of the reaction will be: