(A) : BCl₃ has zero dipole moment.
(R) : B–Cl bond has no bond moment.

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(A) is true but (R) is false

Both (A) and (R) are true and (R) is the correct explanation of (A)

Both (A) and (R) are false

Both (A) and (R) are true and (R) is not the correct explanation of (A)

answer is C.

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Detailed Solution

B-Cl bond is polar due to electronegativity difference between B and Cl.
In BCl₃, the central B atom undergoes sp² hybridization which results in plane triangular geometry. The molecule has symmetry and the individual bond dipoles cancel each other. Hence, the molecule has zero dipole moment.

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