The strongest ortho/para directing group is

• -NH₂

• -CH₃

• -Cl

• -C₂H₅

142.

An organic alkadiene on reductive ozonolysis produces
(i) acetaldehyde
(ii) acetone
(iii) 2-methylpropane-1,3-dial
The formula of alkadiene will be

• CH₃C(CH₃)=CHCH(CH₃)CH=CHCH₃

• CH₃CH(CH₃)CH=C(CH₃)CH=CHCH₃

• CH₃C(CH₃)=CHCHC(CH₃)=CHCH₃

• CH₃CH₂CH(CH₃)CH=CHC(CH₃)=CH₂

2-chloro-3-methylbutane is treated with sodium in etherial solution, then it will give

• 2,4-dimethylhexane

• 3,5-dimethylhexane

• 2,3,4,5-tetramethylhexane

• 2,6-dimethyloctane

Which one of the following hydrocarbons has octane number 100?

• 2, 2, 3-trimethylpentane

• 2, 3, 3-trimethylpentane

• 2, 2, 4-trimethylpentane

• 2, 3, 4-trimethylpentane

Which one of the following is the best reagent to accomplish the following conversion ?

${\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{Br} \stackrel{?}{\to } {\mathrm{CH}}_3-{\mathrm{CH}}_3$

• NaBH₃

• Na|ether

• Zn|C₂H₅OH

• Mg followed by H₃O⁺

Benzene has the following hybridisation

• sp

• sp²

• sp³

• dsp²

Propyne and propene can be distinguished by

• conc. H₂SO₄

• Br₂ in CCl₄

• dil. H₂SO₄

• AgNO₃ in ammonia

C₂H₅Cl $\underset{\mathrm{CuI}}{\overset{\mathrm{Li}}{\to }} \stackrel{{\mathrm{C}}_2{\mathrm{H}}_5\mathrm{Cl}}{\to } \mathrm{n}-\mathrm{butane}$. This method is

• Wurtz synthesis

• Kolbe synthesis

• Corey House synthesis

• Friedel-Craft synthesis

One of the isomer of the 5^th member of alkyne series is optically active. It is

• 4-methyl pent-2-yne

• 3-methyl pent-1-yne

• 4-methyl pent-1-yne

• 3, 3-dimethyl but-1-yne

Which compound present in diesel?

• Cetane

• TiCl₄

• Cyclo pentandenyl manganese carbonyl

• Iso octane