Hydrocarbons MCQs for NEET — Chemistry Questions with Answers

Consider the following statements :

a. ${\mathrm{CH}}_3$ group is o, p-directing group due to hyperconjugation.

b. ${\mathrm{CCl}}_3$ is meta directing group due to reverse hyperconjugation.

c.${\mathrm{CCl}}_3$  group is meta directing group due to mesomeric effect.

d. CHO group is m-directing group 

Of these statements :

In the given reaction,

${\mathrm{C}}_6{\mathrm{H}}_5-\mathrm{C}\equiv \mathrm{C}-{\mathrm{CH}}_3\stackrel{\mathrm{Na}/{\mathrm{NH}}_3\left(\mathcal{l}\right)}{\to }\left[\mathrm{X}\right]$

[X] will be 

In which compounds addition reaction will take place according to anti-Markovnikov's rule?

(i) $H_{2}C=CH-N{O}_2$

(ii) $H_{2}C=CH-CHO$

(iii) $H_{2}C=CH-CN$

(iv) $C{H}_3-CH=C{H}_2$

Select the correct  answer from the codes given below:

Codes:

Consider the following statements:

(i) Alkene is more reactive than alkyne for electrophilic addition reaction.

(ii) Alkyne gives nucleophilic as well as electrophilic addition reaction.

(iii) Alkyne is more reactive than alkene for nucleophilic addition reaction.

(iv) For electrophilic addition reaction, RI of alkyne is alkyl carbonation.

Of these, correct statements are:

Which compound is least reactive for nucleophilic addition reaction?

The reaction, ${\mathrm{CH}}_2=\mathrm{CHCHO}\stackrel{\mathrm{HX}}{\to }\mathrm{gives}:$

The reagent used in dehalogenation process is:

Zn-Cu couple used as reducing agent is:

Which reaction sequence would be best to prepare 3-chloro-aniline from benzene?

An unknown compound A has a molecular formula C₄H₆. When A is treated with excess of Br₂ a new substance B with formula C₄H₆Br₄ is formed. A forms a white ppt. with ammoniacal silver nitrate solution. A may be: