Doubt from reaction mechanism

Example 1 :


Example 2 :

Example 3 :

Example 4 :

Example 5 :

For example 4 is ans A?

Is a option the answer for 5

For 1 is b option ans

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For all examples option b is correct ans.

This is for example 4

But why 'H' is removed from 'C' which is right to bromine and not from the 'C' which is left to 'Br' to which 'D' is attached ?

Example 2 & 3 are solved..plz do help for other eg..

Actually, even I have that doubt. Since you had asked 'mechanisms' so I uploaded mechanism part.:slightly_smiling_face:

The reason why I think A is right because always in de-halohydrogenation the number of alpha hydrogens for the double bond is calculated. More the number, more is the stability....

How to identify dipolar molecule in eg. 1?

i think for the first example the answer is d confirm please

Even I marked d option but the ans given is b.

I am quite sure a cannot be the answer A as No CZ
One way you can tell is through its geometry—whether the compound is symmetrical or not. Often, symmetrical compounds are nonpolar as they indicate that electrical charges are even at its ends.