Which of the following contain + M but - I effect - A) O = CH –
B) – NO2
C) –Cl
D) CH3-

answer:

C) –Cl.

Explanation:

Chlorine atom withdraws electrons by I effect as it is more electronegative than carbon atom. It donates electrons by resonance effect by donating electron pair by electromeric effect.

Explanation:

Ionic crystal is a class of crystal consisting of a lattice of ions held together by electrostatic interactions; they exhibit strong absorption of infrared radiation and have planes along which they cleave easily. crystal latticeA regular three-dimensional geometric arrangement of atoms, molecules, or ions in a crystal.

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answer:

Potassium and sodium because they are highly reactive metals and can react with air to produce flame. That's why they are kept under kerosene oil