the iso-electro negativity of the following elements increases in the order of:
a- C, N, Si, P
b- N, Si, C, P
C- Si, P, C, N
D- P, Si, N, C

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Solution

Generally, electronegativity decreases down a group and increases along a period. Here, carbon and silicon are of one group and nitrogen and phosphorous of another group.
So, the least electronigativity should be of Silicon with left of the period and down in the group.
So, the trend following should be , Si<P<C<N

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the iso-electro negativity of the following elements increases in the order of:a- C, N, Si, Pb- N, Si, C, PC- Si, P, C, ND- P, Si, N, C

the iso-electro negativity of the following elements increases in the order of:
a- C, N, Si, P
b- N, Si, C, P
C- Si, P, C, N
D- P, Si, N, C