1
MCQ (Single Correct Answer)

NEET 2017

With respect to the conformers of ethane, which of the following statements is true?
A
Bond angle changes but bond length remains same.
B
Both bond angle and bond length change.
C
Both bond angle and bond length remain same.
D
Bond angle remains same but bond length changes.

Explanation

Conformers are the isomers which are formed by rotation about single bonds without any cleavage of any bond. These conformers have same bond angle between them and have same bond length while their dihedral angle changes.
2
MCQ (Single Correct Answer)

NEET 2017

Predict the correct intermediate and product in the following reaction :

$${H_3}C - C \equiv CH\mathrel{\mathop{\kern0pt\longrightarrow} \limits_{HgS{O_4}}^{{H_2}O,{H_2}S{O_4}}} \mathop {Intermediate}\limits_{(A)} \to \mathop {\Pr oduct}\limits_{(B)} $$
A
B
C
D

Explanation

3
MCQ (Single Correct Answer)

NEET 2017

Which one is the correct order of acidity?
A
CH$$ \equiv $$CH > CH3 $$-$$C$$ \equiv $$CH
                    > CH2 $$=$$ CH2 > CH3$$-$$CH3
B
CH $$ \equiv $$ CH > CH2 $$=$$ CH2
                    > CH3$$-$$C $$ \equiv $$ CH > CH3 $$-$$CH3
C
CH3$$-$$CH3 > CH2 $$=$$ CH2
                    > CH3 $$-$$C $$ \equiv $$ CH > CH$$ \equiv $$CH
D
CH2$$=$$CH2 > CH3 $$-$$ CH $$=$$ CH2
                    > CH3 $$-$$ C$$ \equiv $$ CH > CH $$ \equiv $$ CH

Explanation

Greater the character of C-atom in hydrocarbons, greater the electronegativity of that carbon and thus greater the acidic nature of the H attached to electronegative carbon.

Thus CH$$ \equiv $$CH > CH3 $$-$$C$$ \equiv $$CH
                    > CH2 $$=$$ CH2 > CH3$$-$$CH3
4
MCQ (Single Correct Answer)

NEET 2016 Phase 1

In the reaction


X and Y are
A
X = 2-Butyne,  Y = 2-Hexyne
B
X = 1-Butyne,  Y = 2-Hexyne
C
X = 1-Butyne,  Y = 3-Hexyne
D
X = 2-Butyne,  Y = 3-Hexyne

Explanation

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