Match List - I with List- II. Choose the correct answer from the options given below:
| List - I (Hydrides) | List - II (Nature) | ||
| (a) | MgH2 | (i) | Electron precise |
| (b) | GrH4 | (ii) | Electron deficient |
| (c) | B2H6 | (iii) | Electron rich |
| (d) | HF | (iv) | Ionic |
To solve this matching problem, we need to correctly pair each hydride from List - I with its nature from List - II:
Based on these pairings, the correct match is:
From the given following (A to D) cyclic structures, those which will not react with Tollen's reagent are : 
Compound 'P' undergoes the following sequence of reactions : (i) NH₃ (ii) $\Delta$ $\rightarrow$ Q (i) KOH, Br₂ (ii) CHCl₃, KOH (alc), $\Delta$ $\rightarrow$ NC-CH₃. 'P' is : 

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The output (Y) of the given logic implementation is similar to the output of an/a …………. gate.
Such a group of atoms is called a molecule. Obviously, there must be some force that holds these constituent atoms together in the molecules. The attractive force which holds various constituents (atoms, ions, etc.) together in different chemical species is called a chemical bond.
There are 4 types of chemical bonds which are formed by atoms or molecules to yield compounds.