Problem on Photochemistry (with simple trick)-GATE 2017

The problem asked in GATE 2017, I've tried to solve the question with complete mechanism and at the end I've given a simple trick to solve these type of questions.
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[@muddasirahmad]

Make more videos for gate exam 2018.

[@AllBoutChemistry]

Yes I will upload them soon.

[@blossomflowers4775]

Sir make a video on photochemistry

[@studycare7982]

Do vidio about quantum efficiency

[@jaydave5631]

Please solve all questions of 2017 GATE paper

[@AllBoutChemistry]

Yes I will upload the videos soon..

[@chemicalreagents1217]

Sir uploading for Styx code calculate for Borane

[@waytonatures]

option a m bhi to 2 phenyl group h cyclopropane ke sath ...vo bhi ho sakta h answ to

[@paddupaddu7756]

Sir please upload June 2011 question no 21 and 22

[@gayatreesahoo39]

Sir plz do a vedio in class of photochemistry all type reaction .plz...sir

[@manasa109]

Pls add more viedo classes on organic photochemistry

[@kritialam9404]

Why does the previously formed 3 membered ring break?

[@betsyfrank7827]

Cyclopropane ring strain