Question

pls help me with this question
need explaination!!!
​

Answer 1

hope it helps you see the attachment for further information....

sorry for the blurred image as this question ...

i have solved it very ago so it's went dirty..

please don't mind..

Answer 2

Solution:-Bond length is inversely proportional to bond order

so,

sequence of bond length in compounds are as below

single bond>double bond>triple bond

clearly we can see

figure

as there is single bond in first option so there will be no possibility...

also,there will be no possibility for the second option as well because there is only one double bond ,,which is.between c-c

there will be no.resonance in this case

In anniline(iii) and para amino Bezaldehyde (iv),,there is partial double bond due to resonace....

but the partial double bond will be more in para amino Bezaldehyde (iv) as compare to III)

so,

option;iv) is the correct one ✔️✔️