q1,4,5,6

Q 14 - Draw structures of all compounds
Find out chemically similar or equivalents hydrogen
Pick up the structure where you have only one type of hydrogens
Like in the given question it is option 1 as it has all Hydrogens in the similar chemical environment   

Halogenation of alkanes in the presence of sunlight or heat is always free radical halogenation . In this reaction, free radicals are formed as intermediates.

Methyl group is electron-donating group and ortho and para director so Cl electrophile generated will go on ortho and para positions.
so option one is the answer

i do not have doubt in q 14 but in q 4

Please check the image which you have sent there is no question 4 in that image
I request you to send only the image of that question in which you have
doubt.
It is very easy to crop the image and post specific doubt on the forum