1. The number of sigma (σ) and pi (π) bonds in pent-2-en-4-yne is
(a) 13 σ bonds and no π bond
(b) 10 σ bonds and 3 π bonds
(c) 8 σ bonds and 5 π bonds
(d) 11 σ bonds and 2 π bonds. (NEET 2019)
2. Which of the following molecules represents the order of hybridisation sp2, sp2, sp, sp from left to right atoms?
(a) HC=C — C=CH
(b) CH2=CH — C=CH
(c) CH2=CH — CH=CH2
(d) CH3 — CH=CH — CH3 (NEET 2018)
3. The total number of π-bond electrons in the following structure is
(a) 12 (b) 16 (c) 4 (d) 8 (2015)
4.
(2009)
(1) sp, sp2, sp3 and sp2 (2) sp, sp3, sp2 and sp3
(3) sp3, sp2, sp2 and sp (4) sp, sp2, sp2 and sp3
-
NEET-UG 2015 Chemistry Question Paper with Answer Key
-
NEET-UG 2014 Chemistry Question Paper with Answer Key
-
NEET-UG 2013 Chemistry Question Paper with Answer Key
-
NEET-UG 2012 Chemistry Question Paper with Answer Key
-
NEET-UG 2011 Chemistry Question Paper with Answer Key
-
NEET-UG 2010 Chemistry Question Paper with Answer Key
5.
(a) sp, sp2, sp3 (b) sp3, sp2, sp
(c) sp2, sp, sp3 (d) sp, sp3, sp2 (2008)
11.
(a) 5-formylhex-2-en-3-one
(b) 5-methyl-4-oxohex-2-en-5-al
(c) 3-keto-2-methylhex-5-enal
(d) 3-keto-2-methylhex-4-enal (2017)
12. The structure of isobutyl group in an organic compound is
(a)
(b)
(c)
(d) (2013)
13. Structure of the compound whose IUPAC name is 3-ethyl-2-hydroxy-4-methylhex-3-en-5-ynoic acid is
(a)
(b)
(c)
(d) (2013)
14. Which nomenclature is not according to IUPAC system?
(a)
(b)
(c)
(d) (2012)
15.
(a) 4-ethyl-3-propylhex-1-ene
(b) 3-ethyl-4-ethenylheptane
(c) 3-ethyl-4-propylhex-5-ene
(d) 3-(1-ethylpropyl)hex-1-ene. (2011)
16.
(a) trans-2-chloro-3-iodo-2-pentene
(b) cis-3-iodo-4-chloro-3-pentane
(c) trans-3-iodo-4-chloro-3-pentene
(d) cis-2-chloro-3-iodo-2-pentene. (2011)
17. The IUPAC name of the compound CH3CH = CHC ≡ CH is
(1) Pent-4-yn-2-ene (2) Pent-3-en-1-yne
(3) Pent-2-en-4-yne (4) Pent-1-yn-3-ene (2010)
18. The IUPAC name of the compound having the formula CH = C — CH = CH2 is
(a) 1-butyne-3-ene (b) but-1-yne-3-ene
(c) 1-butene-3-yne (d) 3-butene-1-yne. (2009)
19.
(a) 1-chloro-1-oxo-2,3-dimethylpentane
(b) 2-ethyl-3-methylbutanoyl chloride
(c) 2,3-dimethylpentanoyl chloride
(d) 3,4-dimethylpentanoyl chloride. (2006)