MCQ
When acetaldehyde reacts with $PC{l_5},$ the resulting compound is
- AEthyl chloride
- BEthylene chloride
- ✓Ethylidene chloride
- DTrichloro acetaldehyde
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| $a.$ | $\ce{As_2O_3 < SiO_2 < P_2O_3 < SO_2}$ | Acid strength. |
| $b.$ | $\ce{AsH_3 < PH_3 < NH_3}$ | Enthalpy of vapourisation. |
| $c.$ | $\ce{S < O < Cl < F}$ | More negative electron gain enthalpy. |
| $d.$ | $\ce{H_2O > H_2S > H_2Se > H_2Te}$ | Thermal stability. |

| Gas | $\text{CO}_2$ | $\text{SO}_2$ | $\text{CH}_4$ | $\text{H}_2$ |
| Critical temp$./K$ | $304$ | $630$ | $190$ | $33$ |
$(1)$ Denaturation of proteins causes loss of secondary and tertiary structures of the protein.
$(2)$ Denaturation leads to the conversion of double strand of $DNA$ into single strand.
$(3)$ Denaturation affects primary structure which gets distorted.