Science (English Medium) Class 12 - CBSE Question Bank Solutions for Chemistry

An organic molecule necessarily shows optical activity if it ____________.

Which of the following is a chiral compound?

Among the following, the dissociation constant is highest for:

Which of the following is a disaccharide?

The sugar that is characteristic of milk is ____________.

Which one is a disaccharide?

The commonest disaccharide has the molecular formula:

Maltose and glucose are ____________.

Sucrose on hydrolysis gives:

The boiling point of an azeotropic mixture of water and ethanol is less than that of water and ethanol. The mixture shows ____________.

S_N1 reaction of alkyl halides lead to ___________.

Identify the end product (C) in the following sequence:

\[\ce{C2H5OH ->[SOCl2][Pyridine] A ->[KCN {(alc.)}] B ->[2H2O/H^+] C}\]

Identify X and Y in the following sequence:

\[\ce{C2H5Br ->[X] Product ->[Y] C3H7NH2}\]

Which of the following has not a glucosidic linkage?

The coordination number of Y will be in the XY types of crystal:

Considering the formation, breaking and strength of hydrogen bond, predict which of the following mixtures will show a positive deviation from Raoult’s law?

Which of the following undergoes nucleophilic substitution exclusively by S_N1 mechanism?

The increasing order of nucleophilicity would be:

The correct order of increasing the reactivity of C–X bond towards nucleophile in following compounds.

    (I)

     (II)

(CH₃)₃CCl
    (III)

(CH₃)₂CHCl
    (IV)

Which of the following compound will undergo racemisation when reacts with aq. KOH?

(i)

(ii)

CH₃CH₂CH₂Cl

(iii)

\[\begin{array}{cc}
\ce{CH3}\phantom{..}\\
|\phantom{....}\\
\ce{CH3-CH-CH2Cl}
\end{array}\]

(iv)

\[\begin{array}{cc}
\phantom{..}\ce{H}\\
\phantom{..}|\\
\ce{CH3-C-Cl}\\
\phantom{..}|\\
\phantom{.....}\ce{C2H5}
\end{array}\]