MCQ
Which of the following is the most stable alkene
- ✓${R_2}C = C{R_2}$
- B$RCH = CHR$
- C${R_2}C = CHR$
- D$C{H_2} = C{H_2}$

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$(a)$ Photon is a positively charged nuclear particle
$(b)$ Size of nucleus is very small as compared to the size of atom
$(c)$ Photoelectric effect and diffraction show particle nature of light
$(d)$ Planck's constant has same dimensions as angular momentum
The correct statements is/are