Chemistry MCQs for NEET — Practice Questions with Answers

(d) $\mathrm{CH}\equiv \mathrm{CH}$$\underset{0°\mathrm{C}}{\overset{\mathrm{NaOCl}}{\to }}\mathrm{CCl}\equiv \mathrm{CCl}$

(d) The ozonolysis of these two produces different products.

(b) Replacement of H-atom of ring usually takes place following ${\mathrm{S}}_{\mathrm{E}}$ reaction mechanism.

(d) Boiling points of alkanes increase as the number of carbon atom increase or molecular mass increase. Alkenes have high boiling point, so ${\mathrm{CH}}_3{\mathrm{CH}}_2{\mathrm{CH}}_2{\mathrm{CH}}_3$ has the lowest boiling point.

The reaction of benzene with methyl chloride (CH3Cl) in the presence of anhydrous aluminum chloride (AlCl3) follows the Friedel-Crafts alkylation mechanism, where a methyl group is introduced onto the benzene ring to form toluene.

(c) It is the Birch reduction ,(name reaction).

(d) In alkynes $\mathrm{C}\equiv \mathrm{C}$ is present, in such bond one sigma and two $\mathrm{\pi }$-bonds are present. Sigma bond is formed by sp-hybrid orbitals whereas $\mathrm{\pi }$-bonds are formed by unhybridised orbitals.

Hence, it shows cylindrical shape. 

(d) Acetylene have shortest $\mathrm{C}-\mathrm{C}$ bond length because it have $\mathrm{C}\equiv \mathrm{C}$ triple bond. The bond length follows the following order

                 $\mathrm{C}-\mathrm{C}$ > $\mathrm{C}\equiv \mathrm{C}$ > $\mathrm{C}\equiv \mathrm{C}$

(c) The $\mathrm{C}-\mathrm{C}$ bond length is maximum for single bond, so butane have largest $\mathrm{C}-\mathrm{C}$ bond length because it contains carbon-carbon single bond.