MCQ
Which dimethylcyclobutane is optically active ?
- ✓$trans-1, 2$
- B$cis-1, 2$
- C$trans-1, 3$
- D$cis-1, 3$

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$Cr _2 O _7^{2-}+ XH ^{+}+6 Fe ^{2+} \rightarrow YCr ^{3+}+6 Fe ^{3+}+ ZH _2 O$
The sum of $X . Y$ and $Z$ is $.......$.