MCQ
Lassaigne's test is used for detection of :
- ANitrogen and Sulphur only
- BNitrogen, Sulphur and Phosphorous Only
- CPhosphorous and halogens only
- ✓Nitrogen, Sulphur, phosphorous and halogens
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In the above reaction $A, B$ and $C $ are the following compounds

Assertion $(A)$: Cis form of alkene is found to be more polar than the trans form
Reason $(R)$: Dipole moment of trans isomer of $2$-butene is zero.
In the light of the above statements, choose the correct answer from the options given below :