The IUPAC name of the compound ${\mathrm{CH}}_3\mathrm{CH}=\mathrm{CHC}\equiv \mathrm{CH} \mathrm{is}$ is

• pent-4-yn-2-ene

• pent-3-en-1-yne

• pent-2-en-4-yne

• pent-1-yn-3-ene

Consider the reactions,

$$\begin{gathered} ({\mathrm{CH}}_3{)}_2\mathrm{CH}-{\mathrm{CH}}_2\mathrm{Br} \stackrel{{\mathrm{C}}_2{\mathrm{H}}_5\mathrm{OH}}{\to }({\mathrm{CH}}_3{)}_2\mathrm{CH}-{\mathrm{CH}}_2{\mathrm{OC}}_2{\mathrm{H}}_5 + \mathrm{HBr} \\ ({\mathrm{CH}}_3{)}_2\mathrm{CH}-{\mathrm{CH}}_2\mathrm{Br} \stackrel{{\mathrm{C}}_2{\mathrm{H}}_5{\mathrm{O}}^{-}}{\to }({\mathrm{CH}}_3{)}_2\mathrm{CH}-{\mathrm{CH}}_2{\mathrm{OC}}_2{\mathrm{H}}_5 + {\mathrm{Br}}^{-} \end{gathered}$$

The mechanisms of reactions (i) and (ii) are respectively

• S_N 1 and S_N2

• S_N 1 and S_N1

• S_N 2 and S_N 2

• S_N 2 and S_N1

${\mathrm{CH}}_3{\mathrm{CH}}_3 + {\mathrm{HNO}}_3 \stackrel{675\mathrm{K}}{\to } ?$

• CH₃CH₂NO₂

• CH₃CH₂NO₂ + CH₃NO₂

• 2CH₃NO₂

• CH₂$=$ CH₂

In which of the below reaction do we find $\mathrm{\alpha },\mathrm{\beta }-$unsaturated carbonyl compounds undergoing a ring closure reaction with conjugated dienes?

• Perkin reaction

• Diels-Alder reaction

• Claisen rearrangement

• Hofmann reaction

35.

Consider the following carbocations,

$$\begin{gathered} \left(\mathrm{I}\right) {\mathrm{C}}_6{\mathrm{H}}_5\stackrel{+}{\mathrm{C}}{\mathrm{H}}_2 \left(\mathrm{II}\right) {\mathrm{C}}_6{\mathrm{H}}_5{\mathrm{CH}}_2\stackrel{+}{\mathrm{C}}{\mathrm{H}}_2 \\ \left(\mathrm{III}\right) {\mathrm{C}}_6{\mathrm{H}}_5\stackrel{+}{\mathrm{C}}{\mathrm{HCH}}_3 \left(\mathrm{IV}\right) {\mathrm{C}}_6{\mathrm{H}}_5\stackrel{+}{\mathrm{C}}({\mathrm{CH}}_3{)}_2 \end{gathered}$$

The correct sequence of the stability of these is

• II < I < III < IV

• II < III < I < IV

• III < I < II < IV

• IV < III < I < II

2 2-dichloro propane on hydrolysis yields

• acetone

• 2, 2-propane diol

• isopropyl alcohol

• acetaldehyde

For synthesis of 1-butene, CH3MgI should be treated with

• propene

• 2-chloropropene

• allyl chloride

• ethyl chloride

Ethylidene dichloride is obtained by the reaction of excess of HCl with

• ethylene

• acetylene

• propene

• methane

Hardening of oil is done by

• dehydrogenation

• hydrogenation

• dehydrohalogenation

• dehydration

Which one of the following compounds will react with methyl magnesium iodide ?

• CH₃CH₂CH₂CH₂CH₃

• ${\mathrm{CH}}_3\mathrm{CH}=\mathrm{CH}-\mathrm{CH}={\mathrm{CH}}_2$

• ${\mathrm{CH}}_3-\mathrm{C}\equiv \mathrm{C}-{\mathrm{CH}}_2{\mathrm{CH}}_3$

• ${\mathrm{CH}}_3{\mathrm{CH}}_2{\mathrm{CH}}_2\mathrm{C}\equiv \mathrm{CH}$