HSC Science कक्षा ११ - Tamil Nadu Board of Secondary Education Question Bank Solutions for Chemistry

Write the molecular formula and possible structural formula of the first four members of homologous series of carboxylic acids.

Write the molecular formula of the first six members of homologous series of nitro – alkanes.

Give example for the following type of organic reaction.

Electrophilic substitution

\[\ce{C2H5Br + 2Na ->[dry ether]C4H10 + 2NaBr}\]

The above reaction is an example of which of the following.

In the following reaction,

The major product obtained is

Which of the following is optically active?

The compounds formed at anode in the electrolysis of an aquous solution of potassium acetate are ______.

The general formula for cyclo alkanes.

Which of the following compounds shall not produce propene by reaction with HBr followed by elemination (or) only direct elimination reaction (NEET).

Cis – 2- butene and trans – 2 – butene are ______.

\[\begin{array}{cc}
\ce{CH2 - CH2 ->[(A)] CH ≡ CH}\\
|\phantom{.......}|\phantom{.................}\\
\ce{Br}\phantom{.....}\ce{Br}\phantom{.................}
\end{array}\], where A is,

Describe the conformers of n – butane.

Which of the following compounds will give racemic mixture on nucleophilic substitution by OH- ion?

1. \[\begin{array}{cc}\ce{CH3 - CH - CH2Br}\\
   |\phantom{....}\\\ce{C2H5}\end{array}\]
2. \[\begin{array}{cc}\ce{CH3}\\
   |\phantom{.}\\\ce{H3C - C - C2H5}\\
   |\phantom{.}\\\ce{Br}\end{array}\]
3. \[\begin{array}{cc}\ce{H}\\
   |\phantom{.}\\\ce{CH3 - C - C2H5}\\
   |\phantom{.}\\\ce{Cl}\end{array}\]

The treatment of ethyl formate with excess of RMgX gives

The carbocation formed in SN¹ reaction of alkyl halide in the slow step is ______.

The raw material for Raschig process

Which alkyl halide from the following pair is

1. chiral
2. undergoes faster S_N2 reaction?

Complete the following reaction.

\[\ce{C6H5Cl + Mg ->[THF]}\]

Complete the following reaction.

\[\ce{CHCl3 + HNO3 ->[\Delta]}\]

An element X has the following isotopic composition ²⁰⁰X = 90%, ¹⁹⁹X = 8% and ²⁰²X = 2%. The weighted average atomic mass of the element X is closest to