Surface Chemistry — Chemistry STD 12 — Question

Assertion(A): Benzoic acid does not undergo friedel crafts reaction.
Reason (R): This is due to the strong deactivating nature of the carboxyl group

Consider the following statements.
(i) Amines have higher boiling point than alcohols.
(ii) Lower aliphatic amines are colourless gases whereas higher amines have fish like small.
(iii) Aniline and arylamines are colourless but when exposed to air they become coloured due to oxidation.
Which of the above statement(s) is / are correct?

Which of the following is called oil of mirbane?

Borontrifluoride reacts with sodium hydride at 450 K gives …………

Which one of the following is used to cure headache, muscle strain, arthritis?

Which one of the following formula is used to calculate the density of the unit cell ?

Which of the following is an antidiabatic drug?

Consider the following statement
(I) The relative arrangement of amino acids in the polypeptide chain called the secondary structure of protein.
(ii) α – Helix and β – strands are two most common sub structures formed by proteins.
(iii) α – Helix and β – strands further folds to form the three dimensional arrangement in tertiary structure of proteins.
Which of the above statement is / are correct?

Which one of the following is not a pnictogens?