MCQ
Which of the following is correct about starch?
- AIt is a white cyrstalline powder.
- BColoured amorphous powder.
- CIt is white-amorphous powder.
- DColoured crystalline compound.
Explanation:
Starchis white-amorphous powder. It a odourless, tasteless, solid carbohydrate, (C6H10O5)n, occurring in the form of minute granules in the seeds tubers, and other parts of plants, and forming an important constituent of rice, corn, wheat, beans, potatoes and many other vegetable foods. It is used as a thickener or stabilizer.
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Assertion $(A)$ : Haloalkanes react with $\mathrm{KCN}$ to form alkyl cyanides as a main product while with $\mathrm{AgCN}$ form isocyanide as the main product.
Reason $(R)$ : $\mathrm{KCN}$ and $\mathrm{AgCN}$ both are highly ionic compounds.
In the light of the above statement, choose the most appropriate answer from the options given below:
| List $I$ (Haloalkane/arene) | Lits $II$ (Application) | ||
| $A.$ | Iodoform | $1.$ | $CF_4$ |
| $B.$ | $BHC$ | $2.$ | Antiseptic |
| $C.$ | Freon $-14$ | $3.$ | Moth repellent |
| $D.$ | Halothanes | $4.$ | Inhalative anaesthetic |
| $E.$ | $p-$ Dichlorobenzene | $5.$ | Termite pesticide |