MCQ
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- ANucleophilic addition
- BNucleophilic substitution
- CElectrophilic addition
- ✓Electrophilic substitution

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The order of the energies would be :
| List$-I$ Test/Reagents/Observation(s) | List$-II$ Species detected |
| $(a)$ Lassaigne's Test | $(i)$ Carbon |
| $(b)\;Cu ( II )$ oxide | $(ii)$ Sulphur |
| $(c)$ Silver nitrate | $(iii)\;N , S , P ,$ and halogen |
| $(d)$ The sodium fusion extract gives black precipitate with acetic acid and lead acetate | $(iv)$ Halogen Specifically |
The correct match is
Reason : $sp$ hybridised carbon atoms of acetylene are considerably electronegative.
[Use mass of electron $\left.=9.1 \times 10^{-31}\, \mathrm{~kg}, \mathrm{~h}=6.63 \times 10^{-34}\, \mathrm{~J} \mathrm{~s}, \pi=3.14\right]$