The nuclei of which one of the following pairs of nuclei

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The nuclei of which one of the following pairs of nuclei are isotones?

1. ₃₄Se⁷⁴ , ₃₂Ga⁷¹
2. ₃₈Sr⁸⁴ , ₃₈Sr⁸⁶
3. ₄₂Mo⁹² , ₄₀Zr⁹²
4. ₂₀Ca⁴⁰ , ₁₆S³²

Correct Option: A

Isotones means equal number of neutrons i.e.,
(A–Z) = 74 –34 = 71 – 31 = 40.