HSC Science कक्षा १२ - Tamil Nadu Board of Secondary Education Question Bank Solutions for Chemistry

Account for the following.

Ethylamine is soluble in water whereas aniline is not.

Account for the following.

Although amino group is o- and p-directing in aromatic electrophilic substitution reactions, aniline on nitration gives a substantial amount of m-nitroaniline.

Arrange the following:

In increasing order of solubility in water:

C₆H₅NH₂, (C₂H₅)₂NH, C₂H₅NH₂

Arrange the following.

In decreasing order of basic strength in gas phase (C₂H₅)NH₂, (C₂H₅)NH, (C₂H₅)₃N and NH₃.

Arrange the following.

In increasing order of boiling point C₆H₅OH, (CH₃)₂NH, C₂H₅NH₂.

Arrange the following.

In decreasing order of the pK_b values C₂H₅NH₂, C₆H₅NHCH₃, (C₂H)₂NH and CH₃NH₂.

Arrange the following.

Increasing order of basic strength C₆H₅NH₂, C₆H₅N(CH₃)₂, (C₂H₅)₂NH and CH₃NH₂.

Arrange the following.

In decreasing order of basic strength

How will you prepare propan-1-amine from butane nitrile?

How will you prepare propan-1-amine from propanamide?

How will you prepare propan-1-amine from 1-nitropropane?

Identify A, B and C.

\[\ce{CH3 - NO2 ->[LiAlH4] A ->[2CH3CH2Br] B ->[H2SO4] C}\]

How will you convert diethylamine into N, N-diethyl acetamide?

How will you convert diethylamine into N-nitrosodiethylamine?

The central dogma of molecular genetics states that the genetic information flows from:

In a protein, various amino acids linked together by ____________.

Among the following the achiral amino acid is:

In aqueous solution of amino acids mostly exists in, ____________.

Among the following L-serine is:

The secondary structure of a protein refers to ____________.