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Previous year Questions of NEET Haloalkanes and Haloarenes

1. The reaction of C6H5CH=CHCH3 with HBr produces :

(a)                          (b)

(c)                           (d)

2.

(1) Li                     (2) Na                    (3) K                      (4) Rb

4. Elimination reaction of 2-bromopentane to form pent-2-ene is

(A) β – Elimination reaction

(B) Follows Zaitsev rule

(C) Dehydrohalogenation reaction

(D) Dehydration reaction

(a) (A), (B), (C)                         (b) (A), (C), (D)

(c) (B), (C), (D)                         (d) (A), (B), (D)

5. The hydrolysis reaction that takes place at the slowest rate, among the following is

(a)

(b)

(c)

(d)

Chemistry Notes

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Physics Notes

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Biology Notes

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6. The compound A on treatment with Na gives B, and with PCl5 gives C. B and C react together to give diethyl ether. A, B and C are in the order                                     (NEET 2018)

(a) C2H5OH, C2H6, C2H5Cl

(b) C2H5OH, C2H5Cl, C2H5ONa

(c) C2H5Cl, C2H6, C2H5OH

(d) C2H5OH, C2H5ONa, C2H5Cl

7.

                              (NEET2018)

(a) m-bromotoluene

(b) o-bromotoluene

(c) 3-bromo-2,4,6-trichlorotoluene

(d) p-bromotoluene.

8.

(NEET 2017)

(a)

(b)

(c)

(d)

9. Consider the reaction,

CH3CH2CH2Br + NaCN → CH3CH2CH2CN + NaBr

This reaction will be the fastest in                                      (NEET-II 2016)

(a) ethanol

(b) methanol

(c) N , N’ -dimethylformamide (DMF)

(d) water.

10. Which of the following biphenyls is optically active?

(a)                           (b)

(c)                       (d)

12. Twopossiblestereo-structuresof CH3CHOHCOOH, which are optically active, are called                                                                          (2015)

(a) atropisomers                         (b) enantiomers

(c) mesomers                             (d) diastereomers.


13. In an SN1 reaction on chiral centres, there is                         (2015)

(a) inversion more than retention leading to partial racemisation

(b) 100% retention

(c) 100% inversion

(d) 100% racemisation.

14.

        (2014)

(a) (i) and (ii)                             (b) (ii) and (iv)

(c) (iii) and (iv)                          (d) Only (iv)

16. Which of the following acids does not exhibit optical isomerism? (2012)

(a) Maleic acid                 (b) α -Amino acids

(c) Lactic acid                  (d) Tartaric acid (2012)

17.