Doubt from chemical bonding

Q no:42
Need explaination for 1) and 4)th options

For option 1
In chlorobenzene, there is resonance involved which forms a partial double bond character in the carbon-chlorine bond by reducing the net dipole moment.

In cyclohexyl chloride there is no such mechanism

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Option D
Theoretically we see dipole moment according to the electronegativity difference but actually in CO the more dominating factor is coordinate bond which results that dipole is formed due to a complete + ve and - ve charge instead of just partial +ve and -ve charge due to electronegativity difference .
And hence experimental > theoretical