MCQ
The bond order of $He_2^ + $ molecule ion is
- A$1$
- B$2$
- ✓$0.5$
- D$0.25$
$B.O. $ $= \frac{{2 - 1}}{2} = \frac{1}{2} = 0.5$.
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$\text { Given : pKa }\left( CH _3 COOH \right)=4.76$
$\log 2=0.30$
$\log 3=0.48$
Assertion $(A)$ : $\alpha$-halocarboxylic acid on reaction with dil. $NH _3$ gives good yield of $\alpha$-amino carboxylic acid whereas the yield of amines is very low when prepared from alkyl halides.
Reason $(R):$ Amino acids exist in zwitter ion form in aqueous medium.
In the light of the above statements, choose the correct answer from the options given below :
| List-$I$ (Molecule) | List-$II$(Shape) |
| $A$ $\mathrm{NH}_3$ | $I$ Square pyramid |
| $B$ $\mathrm{BrF}_5$ | $II$ Tetrahedral |
| $C$ $\mathrm{PCl}_5$ | $III$ Trigonal pyramidal |
| $D$ $\mathrm{CH}_4$ | $IV$ Trigonal bipyramidal |
Choose the correct answer from the option below :