MCQ
The De-broglie $\lambda$ of electron in the $2^{st}$ Bohr orbit is
- A$4\pi r_1$
- ✓$\pi r_1$
- C$2\pi r_1$
- D$6\pi r_1$
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$HC \equiv CH\mathop {\xrightarrow{{NaN{H_2},C{H_3}COC{H_3}}}}\limits_{{H^ + }} X\mathop {\xrightarrow{{H{g^{2 + }},{H_3}{O^ + }}}}\limits_{{H_2}O} Z$ is